CN101674707B

CN101674707B - Improved matched-impedance surface-mount technology footprints

Info

Publication number: CN101674707B
Application number: CN2009102040727A
Authority: CN
Inventors: D·莫利昂; S·H·J·塞尔屈; W·海伊维特; J·德格斯特
Original assignee: FCI SA
Current assignee: FCI SA
Priority date: 2004-11-29
Filing date: 2005-11-28
Publication date: 2012-02-22
Anticipated expiration: 2025-11-28
Also published as: CN101112135A; CN101112135B; WO2006056473A3; CN101673885A; CN101673886A; CN101673885B; EP1839466A2; CN101673887A; CN101674707A; CN101673887B; WO2006056473A2; CN101673886B

Abstract

Disclosed is a method for defining matched-impedance surface-mount technology footprints on a substrate such as a printed circuit board, for example, that is adapted to receive an electrical component having an arrangement of terminal leads. Such a footprint may include an arrangement of electrically-conductive pads (P) and an arrangement of electrically-conductive vias (V). The via arrangement may differ from the pad arrangement. The vias (V) may be arranged to increase routing density, while limiting cross-talk and providing for matched impedance between the component and the substrate. The via arrangement may be altered to achieve a desired routing density on a layer of the board. Increasing the routing density may decrease the number of board layers, which tends to decrease capacitance and thereby increase impedance. Ground vias (G) and signal vias (S) may be arranged with respect to one another in such a manner as to affect impedance. Thus, the via arrangement may be altered to achieve an impedance that matches the impedance of the component. The via arrangement may be also be altered to limit cross-talk among neighboring signal conductors. Thus, the via arrangement may be defined to balance the impedance, cross-talk, and routing density requirements of the system.

Description

Improved matched-impedance surface-mount technology footprints

Present patent application is to be on November 28th, 2005 applying date; Application number is 200580047301.9 (PCT/EP2005/012691); Priority date the earliest is on November 29th, 2004, and denomination of invention is divided an application for the one Chinese patent application of " improved matched-impedance surface-mount technology footprints ".

The cross reference of related application

According to 35U.S.C. § 119 (e); The application requires in the interim U.S. Patent application no.60/631 of submission on November 29th, 2004; 545, the interim U.S. Patent application no.60/631 that submits on November 29th, 2004; 499, the interim U.S. Patent application no.60/686 that submits on June 1st, 2005,514 priority.

The application relates to U.S. Patent application no. [attorney docket FCI-2877 (C3632)]; It is submitted to therewith same date; Be entitled as " High-Frequency, High-Signal-Density, Surface-Mount Technology Footprint Definitions ".

The content of above referenced each U.S. Patent application is incorporated herein by reference.

Invention field

Generally, the present invention relates to electric connector/circuit board systems.More specifically; The present invention relates to be used on the sort circuit plate, forming the method for the basal surface (footprint) of surface mounting technology; Wherein, With the via arrangement different with the pad arrangement mode via hole of having arranged respect to one another, and the wiring density in the conducting wire of arranging on the substrate that via hole provides is arranged the wiring density that circuit board has under the identical situation greater than arranging with signal pad in signal via.

Background technology

Usually, electric assembly, for example electric connector can comprise a plurality of conductive contacts, its end points part for example can be with the arranged of row and column.Contact L can be signal conductor or earthing conductor, and can arrange along row with the mode of signal-signal-ground connection.Although signal contact can be a single-ended signal conductor, it is right that adjacent signal contact also can constitute differential wave.This assembly can comprise differential wave to any combination of single-ended signal conductor.

The end points part of contact can be admitted by substrate (for example base plate or printed circuit board (PCB)).In the plate end stage, contact lead can be located to stop at electroplating ventilating hole (PTH).The PTH technology is a kind of PCB manufacturing approach, thereby the circuit on one deck can be used electro-plating method, and the through hole through preboring is electrically connected to the circuit on another layer.When using the PTH technology, basal surface or arrays of openings must be aimed at the arrangement of lead-in wire end points part, so that lead-in wire end points part can be held by corresponding through hole on the substrate.

Yet electroplating ventilating hole has limited wiring density (that is, can be arranged in the lip-deep circuit number of flaggy).Therefore electroplating ventilating hole tends to increase provides required wiring necessary flaggy number.Yet, increase the number of plies and increased plate thickness and manufacturing cost.Owing to increased the ground wire number of plies, it has also increased electric capacity.Increase electric capacity and reduced impedance.Therefore, can make that plate resistance is anti-and be lower than the assembly impedance that this has produced undesired discontinuous between the anti-and assembly impedance in plate resistance.What hope is the anti-coupling as much as possible of assembly impedance and plate resistance, with the signal reflex of avoiding occurring owing to impedance is discontinuous.This reflection has produced unnecessary noise, and it can reduce signal integrity.

Optional, can use surface mounting technology (surface mount technology) (SMT) electric assembly to be installed on the circuit board.SMT comprises through each contactor end is electrically connected to and being positioned on the substrate surface on the corresponding SMT pad, and contactor end is electrically connected to substrate surface.The end of contact can comprise conductive weld, and it is welded on the pad usually.On multi-layer sheet, the SMT pad is electrically connected to via hole usually, and via hole extends between the layer of plate, and the line electricity on SMT pad or the layer is connected to the circuit of another layer.

Fig. 1 shows typical SMT connector basal surface, comprises a plurality of SMT pad P during being arranged in pad arranges and is arranged in a plurality of via hole V in the via arrangement.Each via hole V is electrically connected to a corresponding SMT pad P.As shown in, SMT pad P and via hole V can arrange with so-called " dog bone shape (dog-bone) " mode.As inserting shown in the figure, should " dog bone shape " can comprise SMT pad P, via hole V, via pad VP and conductive via circuit VT, conductive via circuit VT is electrically connected via pad and SMT pad.Yet should understand that via hole and SMT pad are not to arrange with this dog bone shape mode.Optional, the SMT pad can be partly or entirely overlapping with corresponding via pad, thereby make and between SMT pad and via pad, directly be connected.This structure is commonly referred to " via hole (via-in-pad) in the pad ".

SMT pad and via hole can be arranged as row and column.As shown in Figure 1, the row along continuous straight runs extends, and E is vertical with panel edges.Row vertically extends, and E is parallel with panel edges.Spacing between the adjacent lines center line can be called line space P _RSpacing between the adjacent columns center line can be called column pitch P _C

SMT pad P and via hole V can be earthing conductor or signal conductor.Signal conductor can be used for single-ended or differential signal transmission.(promptly greater than 1GHz) connector is generally signal transmission and uses differential wave right at a high speed.In differential signal transmission, each signal conductor can match with adjacent signal conductor.Corresponding earthing conductor can be arranged in adjacent signal conductor between.In some connector systems, can comprise earthing conductor, reducing crosstalking between signal conductor, and improve impedance matching.

Pad shown in Figure 1 is arranged and can arranged identical with the lead-in wire in wanting surface mount assembly onboard.For example, the SMT pad can be arranged as row and column, as lead terminal partly is arranged as row and column.In addition, the line space P of pad arrangement _RWith column pitch P _CCan be identical with line space and the column pitch that lead-in wire is arranged.

Similarly, via arrangement can be arranged identical with pad.In other words, for example, via hole V can be arranged as row and column, as SMT pad P is arranged as row and column.In addition, the line space P of via arrangement _VRWith column pitch P _VCThe line space P that can arrange with pad _RWith column pitch P _CIdentical.

As stated, can expect to reduce the number of plies of plate, to reduce as possible between connector and plate and the electric discontinuity between the different layers in the plate.A kind of method that realizes this purpose is the wiring density that increases on each layer of plate.Yet, via arrangement is connected to pad arranges the ability that the confinement plate designer improves wiring density that tends to.

For example, in having the typical connector of 2mm column pitch, the width of horizontal wiring passage (that is the distance between plates between adjacent columns) only can comprise a pair of circuit.Width with typical connector of 3mm column pitch can comprise two pairs of circuits.Similarly, in having the typical connector of 1.4mm line space, the width of vertical routing channel (that is the distance between plates between adjacent lines) only can comprise an independent circuit.Therefore, in order to make signal " vertically " connected connector, first circuit must be arranged between first pair of row, and second circuit must be arranged between the different a pair of row.Yet, hope usually as far as possible closely to arrange and the circuit of signal each other to being associated.

Summary of the invention

A kind of method has been described, has been used to for example substrate regulation surface mounting technology (SMT) the connector basal surface such as printed circuit board (PCB).Substrate can be any substrate, and it is suitable for holding and has the electric assembly that end leads part (being the lead terminal part) is arranged.This basal surface can comprise the arrangement of conduction SMT pad.Corresponding SMT pad can partly link to each other with each end leads.The SMT pad can be arranged in and go between in the corresponding arrangement of arrangement (being the arrangement of end leads part).Basal surface can also comprise the arrangement of conductive via.Each via hole can be electrically connected to a corresponding SMT pad.Via hole can be arranged in pad and arrange (and therefore arranging different with lead-in wire) in the different arrangements.Can be limited in crosstalking in the signal conductor simultaneously, and between connector and substrate, matched impedance is provided with any via hole of arranging in the several different methods of the wiring density that has increased the circuit on the substrate.

Can change via arrangement, that is, via hole can move relative to each other, on one deck of plate, to obtain the wiring density of expection.Increase wiring density and can reduce the flaggy number, reduce electric capacity thus and increase impedance.In addition, can be with the mode that can influence impedance and crosstalk ground connection via hole and the signal via of arranging respect to one another.Distance between paired signal conductor can influence the impedance between it.This to relevant earthing conductor between distance also can influence impedance.Can also change via arrangement, with crosstalking of acceptable degree between the acquisition adjacent signal conductor.Therefore,, can change via arrangement according to the present invention, be implemented in wiring density, impedance matching and crosstalk between desirable balance.

The row of adjacent S MT pad can be signal-signal-ground structure.For example, this arrangement is suitable for the application of edge card (edge card).Pad can be couple to corresponding via hole or the electroplating ventilating hole of arranging with row.Yet the adjacent columns of via hole or electroplating ventilating hole can be interlocked, thereby makes that the signal via or the electroplating ventilating hole of ground connection via hole or through hole and adjacent columns of row is adjacent.By this way, for example the staggered horizontal line of SMT pad can isolate the staggered vertical row of via hole or electroplating ventilating hole.

Therefore; Circuit board can comprise substrate, embarking on journey is arranged in a plurality of conductive welding disks on the substrate, is arranged in the first ground connection via hole and first signal via in first row; And being arranged in the second ground connection via hole and the secondary signal via hole in the secondary series, secondary series is adjacent with first row.Each via hole of first and second row can be electrically connected in the row in a plurality of pads corresponding one.The first ground connection via hole can be adjacent with the secondary signal via hole.

In the first and second ground connection via holes each can be an electroplating ventilating hole.In first and second signal via each can be an electroplating ventilating hole.Said a plurality of pad can be arranged with three pad cell on the signal of repetition, signal, ground.During first grounding contact and second grounding contact can be listed as with respect to first and second at least one constitutes first diagonal.During first signal contact and secondary signal contact can be listed as with respect to first and second at least one constitutes second diagonal.First diagonal can be adjacent with second diagonal.

The electrical property of SMT connector basal surface (that is impedance,, crosstalk and insert loss) can be optimized through some parameter that changes basal surface.The instance of this type of parameter comprises the relative position of signal and the perforate of ground connection via hole, the size of boring, the size of pad etc.Disclosed is the variety of option that is used for respect to the via hole perforate of SMT pad location, so that optimize electrical property.Wiring density also can be optimised, to remove the layer (improve impedance matching and reduce manufacturing cost) among the PCB.Reduce the via hole bore size and increased available wiring channel bandwidth, it can be used for the more or wideer circuit of cloth.

SMT connector basal surface can be designed as any application that is used for using high speed, high density SMT connector (for example, SATA, SAS, DDR, PCI-Express, base plate etc.).In case selected connector, and confirmed that bore dia and signal/ground structure, a plurality of parameters just keep optimised, so that the basal surface performance reaches best.These parameters comprise via pad size, the anti-pad of via hole (anti-pad) size and dimension and via hole counterfoil (via stub) length.

Description of drawings

Fig. 1 shows has layout substrate, typical SMT connector basal surface above that;

Fig. 2 A and 2B have explained according to the present invention the modification that can make the basal surface of Fig. 1;

Fig. 3 A and 3B have explained according to the present invention the modification that can make the basal surface of Fig. 1;

Fig. 4 A shows the partial view of the example embodiment of prior art SMT connector basal surface;

Fig. 4 B-4D shows the partial view according to the example embodiment of SMT connector basal surface of the present invention, with the distance between the via hole of display column spacing and adjacent lines, and in row and the optimal cases of rotation of the via hole between the row;

Fig. 5 A and 5B show the instance of connector basal surface;

Fig. 6 A and 6B show a kind of basal surface, and wherein the via arrangement shown in Fig. 5 A and the 5B is changed in row;

Fig. 7 A and 7B show a kind of basal surface, and wherein the pad from different pad row is couple to the via hole in identical via hole row;

Fig. 8 A and 8B show the instance of connector basal surface;

Fig. 9 A and 9B show a kind of basal surface, and wherein the via arrangement shown in Fig. 8 A and the 8B is changed in row;

Figure 10 A and 10B show a kind of basal surface, and wherein the via arrangement shown in Fig. 8 A and the 8B is changed, so that the via hole column pitch reduces by half;

Figure 11 A and 11B show a kind of basal surface, and wherein the pad from different pad row is couple to the via hole in the identical via hole row;

Figure 12 A and 12B show a kind of basal surface, its with separation signal to the wiring of double density is provided;

Figure 13 A and 13B show a kind of basal surface, and it provides the wiring of double density, and it is right to need not separation signal;

Figure 14 A and 14B show a kind of basal surface, and wherein two row pads are couple to a row via hole;

Figure 15 A and 15B show a kind of basal surface, and wherein two row pads are couple to a row via hole, and it is right to need not separation signal;

Figure 16 A and 16B show a kind of basal surface, and it provides 2.5 times of wiring densities;

Figure 17-21 has explained the modification instance that can make via arrangement according to of the present invention;

Figure 22 A and 22B show a kind of instance of basal surface;

Figure 23 A-C shows a kind of basal surface, and the signal with the via hole in the different lines of being redirected to is right;

Figure 24 A and 24B show a kind of basal surface, and it provides the wiring of two double densities;

Figure 25 A and 25B show a kind of basal surface, and it provides 1.5 times of wiring densities;

Figure 26 A and 26B show a kind of basal surface, and it provides 1.5 times of wiring densities;

Figure 27 A and 27B show a kind of basal surface, and it provides crooked wiring;

Figure 28 A and 28B show a kind of basal surface, and it provides the wiring of two double densities;

Figure 28 C shows a kind of basal surface, and it provides 2.5 times of wiring densities;

Figure 29 shows a basal surface instance, and wherein pad is arranged with row, and corresponding via hole is arranged with staggered row;

Figure 30 A and 30B have explained the various ground connection via hole bore size that are used for the signal conductor via arrangement;

Figure 31 A and 31B have explained the various ground connection via hole bore size that are used for another kind of signal conductor via arrangement; And

Figure 32 A and 32B are that various ground connection via hole bore size provide differential impedance and the curve chart instance of crosstalking respectively.

Embodiment

Fig. 2 A and 2B show the partial view according to the example embodiment of the SMT connector basal surface of one aspect of the invention.Via arrangement shown in Fig. 1 can be revised according to Fig. 2 A and 2B illustrated embodiment, with increase wiring density, matched impedance, and the electrical property of improvement system.

Fig. 2 A shows the first and second earthing conductor via hole G that arrange with linear array (for example column or row) ₁And G ₂, and the first and second signal conductor via hole S ₁And S ₂Signal conductor via hole S ₁And S ₂Can be used for single-ended or differential signal transmission.According to the embodiment shown in Fig. 2 A, at adjacent signal conductor via hole S ₁And S ₂Between spacing A can be less than at signal conductor via hole S ₁With with signal conductor via hole S ₁Adjacent earthing conductor via hole G ₁Between spacing A ₁At adjacent signal conductor via hole S ₁And S ₂Between spacing A can be less than at signal conductor via hole S ₂With with signal conductor via hole S ₂Adjacent earthing conductor via hole G ₂Between spacing A ₂Spacing A ₁Can with spacing A ₂Identical, also can be different.Can select actual distance A, A ₁And A ₂With through better impedance matching with crosstalk and reduce to realize the wiring density of expecting and/or optimize signal transmission performance.

Fig. 2 B shows the first and second signal conductor via hole S that arrange with linear array (for example column or row) ₁, S ₂And single earthing conductor via hole G ₃Signal conductor via hole S ₁, S ₂Can be used for single-ended or differential signal transmission.According to the embodiment shown in Fig. 2 B, at adjacent signal conductor via hole S ₁And S ₂Between spacing A can be less than at signal conductor via hole S ₁With with signal conductor via hole S ₁Spacing A between the adjacent earthing conductor via hole G3 ₃Can select actual distance A and A ₃With through better impedance matching with crosstalk and reduce to realize the wiring density of expecting, and optimize signal transmission performance simultaneously.

Fig. 3 A and 3B show the partial view according to the example embodiment of the SMT connector basal surface of one aspect of the invention.Via arrangement shown in Fig. 1 can be made amendment according to Fig. 3 A and 3B illustrated embodiment, to improve the wiring density and/or the electrical property of system.

Fig. 3 A shows the first and second earthing conductor via hole G ₁And G ₂And the first and second signal conductor via hole S ₁And S ₂Signal conductor via hole S ₁And S ₂Can be used for single-ended or differential signal transmission.Shown in Fig. 3 A, signal conductor via hole S ₁And S ₂Can be with respect to center line C by staggered, wherein via hole is arranged along center line C.In other words, signal conductor via hole S ₁Can be with respect to center line C offset distance B on first direction ₁, and signal conductor via hole S ₂Can be with respect to center line C offset distance B on second direction ₂Second direction can be opposite with first direction, and shown in Fig. 3 A, perhaps two signal via can squint with respect to center line C on equidirectional.

Side-play amount B1 can with side-play amount B ₂Identical or different.As shown in, earthing conductor via hole G ₁And G ₂Can be positioned on the center line C.Like this, signal conductor via hole S ₁And S ₂Can come staggered against each other in such a way: with respect to earthing conductor via hole G ₁And G ₂Symmetry, earthing conductor via hole G ₁And G ₂Respectively with signal conductor via hole S ₁And S ₂Adjacent.Can select actual apart from B ₁And B ₂With through better impedance matching with crosstalk and reduce to realize the wiring density of expecting, and optimize signal transmission performance simultaneously.

At adjacent signal conductor via hole S ₁And S ₂Between space D (C obtains along center line) can be less than at signal conductor via hole S ₁With with signal conductor via hole S ₁Adjacent earthing conductor via hole G ₁Between space D ₁Space D can be less than at signal conductor via hole S ₂With with signal conductor via hole S ₂Adjacent earthing conductor via hole G ₂Between space D ₂Space D ₁Can with space D ₂Identical, also can be different.Can select actual distance B, D ₁And D ₂With through better impedance matching with crosstalk and reduce to realize the wiring density of expecting, and optimize signal transmission performance simultaneously.

Fig. 3 B shows the first and second signal conductor via hole S ₁, S ₂And single earthing conductor via hole G ₃Shown in Fig. 3 B, signal conductor via hole S ₁Can be with respect to center line C offset distance B on first direction ₁, and signal conductor via hole S ₂Can be with respect to center line C offset distance B on second direction ₂Second direction can be opposite with first direction, and shown in Fig. 3 B, perhaps two signal via can squint with respect to center line C on equidirectional.Side-play amount B ₁Can with side-play amount B ₂Identical or different.As shown in, earthing conductor via hole G ₃Can be positioned on the center line C.

At adjacent signal conductor via hole S ₁And S ₂Between space D (C obtains along center line) can be less than at signal conductor via hole S ₁With with signal conductor via hole S ₁Adjacent earthing conductor via hole G ₃Between space D ₃Can select actual distance B and D ₃With through better impedance matching with crosstalk and reduce to realize the wiring density of expecting, and optimize signal transmission performance simultaneously.

Fig. 4 A shows has the fixedly via arrangement of column pitch y.In other words, adjacent columns with distance y apart from one another by.Each row all comprises a plurality of via holes of arranging with the linear array of ground connection-signal-signal structure.Via hole is equidistance spaced apart mutually.In other words, the signal via spacing distance d that each ground connection via hole can be adjacent, and adjacent signal via also can each interval apart from d.As shown in, adjacent columns can be interlocked against each other.In other words, one row can with the adjacent columns relativity shift apart from e.As shown in, offset distance e can with apart from d identical (that is a line space).Yet should be understood that side-play amount can be greater than or less than a line space (that is, offset distance e need not with identical apart from d).

Fig. 4 B shows the optimal cases of column pitch distance and the distance between the via hole of adjacent lines.Should be appreciated that method of the present invention can be used to optimize signal integrity and wiring density, even the two neither one is always best.

Through the via arrangement shown in Fig. 4 B is compared with the via arrangement shown in Fig. 4 A, visible signal conductor via hole is along center line move relative to each other (for example, like the explanation at above combination Fig. 2 A and 2B).Move via hole to such an extent that the wiring density that increases between the adjacent lines more closely is provided each other.Can select D ₁, D ₂And D ₃Value with the wiring density between optimize row, these values can be same to each other or different to each other.The signal conductor via hole can also be with respect to its disalignment (for example, like the explanation at above combination Fig. 3 A and 3B) separately.Can select B ₁And B ₂Value to realize expection restriction to crosstalking, these values can be same to each other or different to each other.

Adjacent columns can be moved more approachingly together.In other words, can be in the distance Y between the row center line shown in Fig. 4 B greater than the distance y between the row center line shown in Fig. 4 A.This provides the increase of wiring density between adjacent columns through widening the wiring channel that is present in via arrangement left side and right side (shown in Fig. 4 B).In other words, the distance, delta shown in Fig. 4 A ₁Can be greater than the distance, delta shown in Fig. 4 B ₂Can select the value of Y and Y1, and the relative displacement E between adjacent columns, with the impedance of balance sysmte, crosstalk and routing density requirements.Shown in Fig. 4 B, for example, two adjacent ground connection via holes, like the ground connection via hole of setting-out around, the single ground connection via hole (shown in broken lines) that can be positioned at (for example, at intermediate point) between this adjacent ground connection via hole replaces.

Fig. 4 C and 4D show the rotation at Lie Nei and the via hole between it.Shown in Fig. 4 C, each signal conductor via hole can be with respect to its disalignment separately, and its offset direction is opposite in the arrangement shown in offset direction and Fig. 4 B.Change another kind of mode, compare with the arrangement shown in Fig. 4 B, each signal is to centering on its central point half-twist.Fig. 4 D shows a kind of arrangement, wherein has only some to being rotated with respect to the arrangement shown in Fig. 4 B.The arrangement of ground connection via hole is identical with the arrangement of the ground connection via hole shown in Fig. 4 A and the 4B.

Fig. 5 A and 5B show the instance of connector basal surface.Fig. 5 A shows top level structure, comprises the via hole V and the pad P of two row dog bone shape structures.As shown in, the line space P of via arrangement _VRLine space P with the arrangement of SMT pad _RIdentical.The column pitch P of via arrangement _VCColumn pitch P with the arrangement of SMT pad _CIdentical.Relative displacement Q between the via hole adjacent columns _VCAnd the relative displacement O between SMT pad adjacent columns _CIdentical.In this basal surface, column pitch P _CCan be about 2mm.Therefore, via arrangement is arranged identical with pad.Fig. 5 B shows the arrangement of the via hole V on internal layer, comprises the example alignment of the anti-pad AP of via hole.Shown in Fig. 5 B, a pair of circuit T can connect up along the wiring channel between adjacent columns.The anti-pad of via hole will be disposed on the ground plane, with this circuit not on one deck.

Fig. 6 A and 6B show a kind of basal surface, wherein with like the mode in the explanation of above-mentioned combination Fig. 2 A and 2B, in row, have changed the via arrangement shown in Fig. 5 A and 5B.Pad shown in Fig. 6 A is arranged and is arranged identical with the pad shown in Fig. 5 A.The adjacent columns of SMT pad is each other with apart from O _CRelativity shift.Via hole column pitch P _VCWith SMT pad column pitch P _CIdentical.Yet via arrangement is changed, can be greater than the spacing A between signal conductor via hole and adjacent earthing conductor via hole at the spacing A between the adjacent signal conductor via hole thereby make ₁, A ₂Even wiring density does not change, expect that also the arrangement shown in Fig. 6 A and 6B can produce higher impedance, and therefore obtain such as the better impedance matching of arrangement shown in Fig. 5 A and the 5B.In addition, the distance A between adjacent vias can be greater than pad rows spacing P _RTherefore, because one or more circuit T _VCan as directedly be arranged between the adjacent lines, wiring density can improve.

Fig. 7 A and 7B show a kind of basal surface, wherein, according to an aspect of the present invention, have changed the via arrangement shown in Fig. 5 A and 5B.Pad shown in Fig. 7 A is arranged and is arranged identical with the pad shown in Fig. 5 A.Via hole column pitch P _VCWith pad column pitch P _CIdentical.Yet basal surface is changed, thereby makes the pad P that is arranged in the different lines be couple to the via hole V that arranges along row.For example, shown in Fig. 7 A, a pair of signal conductor pad P in first pad row (the pad row for example) ₁, P ₂Can be connected to first couple of signal conductor via hole V in via hole row (for example, middle via hole row) ₁, V ₂, a pair of signal conductor pad P in second pad row (for example, following pad row) simultaneously ₃, P ₄Can be connected to second couple of signal conductor via hole V in identical via hole row ₃, V ₄

Even wiring density does not change, expect that also the arrangement shown in Fig. 7 A and 7B produces lower crosstalking such as the arrangement shown in Fig. 5 A and the 5B.As everyone knows, differential crosstalk be adjacent differential wave between the function of the sum of crosstalking.Also well-known, contrary sign between crosstalk can less than same-sign between crosstalk, other is all identical.In other words, when of adjacent pairs is that signal projector is right, and another phase adjacency pair be signal receiver to the time, crosstalking between the phase adjacency pair can be less.According to an aspect of the present invention, can select the phase adjacency pair, with through will that the pad that be associated is routed to adjacent vias is right with the signal with contrary sign, will crosstalk be reduced to minimum.

Fig. 8 A and 8B show a kind of connector basal surface instance.Fig. 8 A shows the via hole V and the pad P of two row dog bone shape structures.Fig. 8 B shows the arrangement of the via hole V on internal layer, comprises the example alignment of the anti-pad AP of via hole.As shown in, the line space P of via arrangement _VRLine space P with the arrangement of SMT pad _RIdentical.The column pitch P of via arrangement _VCColumn pitch P with the arrangement of SMT pad _CIdentical.Alternating quantity O between the via hole adjacent columns _VCAnd the relative displacement O between the adjacent columns of SMT pad _CIdentical.Therefore, via arrangement is arranged identical with the SMT pad.Shown in Fig. 8 B, two couples of circuit T can connect up along the wiring channel between adjacent columns.In this basal surface, column pitch P _CCan be about 3mm.

Fig. 9 A and 9B show a kind of basal surface, wherein, with like the mode in the explanation of above combination Fig. 2 A and 2B, in row, have changed the via arrangement shown in Fig. 8 A and 8B.As shown in, the spacing A between the adjacent signal conductor via hole in row can be greater than the spacing A between signal conductor via hole and adjacent earthing conductor via hole ₁, A ₂Attention can be less than at the anti-pad shown in Fig. 5 B, 6B and the 7B at the anti-pad shown in Fig. 8 B, 9B, 10B and the 11B.The signal integrity that therefore, can be contemplated that use basal surface shown in Fig. 9 A and 9B is good not as using shown in Fig. 6 A and 6B the signal integrity of basal surface.Yet, a pair of circuit T _VCan along shown in each this kind wiring channel connect up.As stated, increase wiring density and can increase impedance through the number of plies that reduces plate.Therefore, the basal surface shown in Fig. 9 A and the 9B provides trading off between signal integrity and impedance matching.

Figure 10 A and 10B show a kind of basal surface, and wherein the via arrangement shown in Fig. 9 A and 9B is further changed so that the via hole column pitch is reduced by half.In other words, at the via hole column pitch P shown in Figure 10 A and the 10B _VCBe about the via hole column pitch P shown in Fig. 9 A and the 9B _VCHalf the (therefore, be about SMT pad column pitch P _CHalf the).Therefore, the width of the wiring channel between the adjacent vias row also is halved.Yet, because double row are arranged, thus double wiring channel is arranged, therefore on wiring density, do not reduce.Yet, through with via arrangement four row in, rather than two row in, signal via is far apart each other, this helps to improve signal integrity.

Figure 11 A and 11B show a kind of basal surface, wherein with like the mode in the explanation of above-mentioned combination Fig. 2 A and 2B, have changed the via arrangement shown in Fig. 8 A and 8B, thereby make the pad that is arranged in the different lines be couple to the via hole of arranging along single via hole row.Figure 11 A arranges with the pad shown in the 11B and arranges identical with the pad shown in Fig. 8 A and the 8B.Via hole column pitch P shown in Figure 11 A and the 11B _VCWith the via hole column pitch P shown in Fig. 8 A and the 8B _VCIdentical.

Yet shown in Figure 11 A, the spacing A between the adjacent signal conductor via hole in row can be greater than the spacing A between signal conductor via hole and adjacent earthing conductor via hole ₁, A ₂In addition; A pair of signal conductor SMT pad P in first pad row (the pad row above for example shown in Figure 11 A) at via hole row (for example can be connected to; Middle via hole row) first couple of signal conductor via hole V in, a pair of signal conductor SMT pad P in second pad row (the pad row for example) can be connected to second couple of signal conductor via hole V in these via hole row simultaneously.Like the explanation of above combination Fig. 7 A and 7B,, can expect that also the arrangement shown in Figure 11 A and the 11B can produce than lower the crosstalking of arrangement shown in Fig. 8 A and the 8B even wiring density does not change.Notice that in the basal surface shown in Figure 11 A and the 11B, the wiring channel between being expert at provides straight relatively circuit T _V, rather than the circuit of the bending shown in Fig. 9 A and the 9B.

Figure 12 A and 12B show a kind of basal surface, wherein, have changed the via arrangement shown in Fig. 8 A and 8B, so that the wiring of double density to be provided between adjacent lines, between adjacent columns, keep the wiring (for example, four pairs rather than two pairs) of double density simultaneously.Although four row pads have been shown among Figure 12 A, the pad shown in Figure 12 A is arranged and is arranged identical with the pad shown in Fig. 8 A.Visible as in Figure 12 B, being perfectly clear, signal is to being separated.For example,

signal conductor

1 and 3 can constitute first pair, and synchronous signal conductor 2 and 4 constitutes second pair.In other words, via hole can be arranged as and make adjacent signal conductor via hole and different differential wave to being associated.For example, can as directedly arrange via hole, thereby make via hole 2 between via hole 1 and 3.Like this, the differential wave that is made up of signal conductor via

hole

1 and 3 is to can " being separated ".Should be understood that being increased in the distance that constitutes between the right conductor has increased impedance.

In addition, as stated, the adjacent vias distance that can be separated from each other, this is apart from allowing in the wiring that constitutes the circuit between the right via hole.As shown in, the two pairs of circuits can be routed in and constitute between the right via hole.This arrangement also allows two ground pads, for example AP ₁And AP ₂Be couple to same ground connection via hole G.Therefore, can delete a plurality of ground connection via holes.

Can change via arrangement to obtain the differential crosstalk of acceptable degree.As well-known, the differential crosstalk in row is the function of the single sum of crosstalking.For example, in arranging shown in Figure 12 B from several the 3rd row, can through will signal

conductor

1 and 2,2 and 3,3 and 4, and the single phase Calais computer differential of crosstalking between 1 and 4 crosstalk.Via arrangement can be changed, and for example via hole can relative to each other move around, until whole single sums of crosstalking near 0 (or being lower than acceptable degree at least).

Figure 13 A and 13B show another kind of basal surface, and it provides the wiring of double density, and it is right to need not separation signal.Pad shown in Figure 13 A is arranged and is arranged identical with the pad shown in Figure 12 A.Figure 13 A and the principle of 13B explanation in combining the description of arranging shown in Figure 12 A and the 12B, equally being used for row also can be used between the row.In other words, via hole can move around against each other, is lower than acceptable degree until differential crosstalk.

Shown in Figure 13 B, adjacent signals is to 3,4 and 5,6 by being separated from each other, but signal is not to being separated (each signal conductor and adjacent with a pair of another signal conductor of its formation in other words).Therefore, adjacent vias is to being separated from each other a distance, and this distance allows to connect up betwixt.As shown in, the four pairs of circuits can be routed in via hole to 3,4 and 5, between 6.

Can through the summation of crosstalking single between the signal conductor is calculated between differential crosstalk.For example, can calculate in differential crosstalk through in

signal conductor

1 and 3,2 and 3,2 and 4, and the single summation of crosstalking between 1 and 4 to 1,2 and 3, between 4.Via hole can move around, and is lower than acceptable degree until differential crosstalk.

Figure 14 A and 14B show a kind of basal surface, and wherein two row pads are couple to a row via hole.As shown in, via hole column pitch P _VCCan be solder pad space length P _CTwice.Therefore, in the internal layer of plate, the wiring channel between the adjacent vias row can be that twice is wide, and is half the although the quantity of this wiring channel possibly have only.As shown in, four to can being routed in the passage, rather than two of wirings are right in each of two passages.Via hole line space P _VRCan be pad rows spacing P _RHalf the.Yet signal is to being separated, to improve signal integrity.In other words, can to belong to unlike signal right for the adjacent signal conductor via hole in via hole row.For example, signal conductor via

hole

1 and 3 can constitute first pair, and signal conductor via hole 2 and 4 can constitute second pair.As shown in, two signals are to can be disposed adjacent one another, and need not to insert betwixt ground connection.Because two ground pads can be couple to a ground connection via hole, therefore can delete a plurality of ground connection via holes.

Figure 15 A and 15B show a kind of basal surface, and wherein two row pads are couple to a row via hole, and it is right to need not separation signal.As shown in, via hole column pitch P _VCCan be pad column pitch P _CTwice.Like this, the wiring channel between the adjacent vias row can be that twice is wide, and is half the although this wiring channel quantity possibly have only.As shown in, four to can being routed in the passage, rather than two of wirings are right in each of two passages.Because two ground pads can be couple to a ground connection via hole, therefore can delete a plurality of ground connection via holes.Via hole line space P _VRCan be pad rows spacing P _RTwice.Signal is to can be along line interlacing.In other words, adjacent signal conductor can belong to a pair of that (for example, via

hole

1 and 2 can constitute first pair; Via hole 3 and 4 can constitute second pair), and two signals can be disposed adjacent one another to (for example, 1,2 and 3,4), and need not to insert betwixt ground connection.

Figure 16 A and 16B show a kind of basal surface, and it provides 2.5 times of wiring densities.Although do not have the display separation signal right, should understand signal to can be separated at the basal surface shown in Figure 16 A and the 16B.Notice that the wiring channel shown in Figure 16 B is identical with the wiring channel shown in Figure 15 B.Yet the basal surface shown in Figure 16 B is that with the basal surface difference shown in Figure 15 B the circuit shown in Figure 16 B can be narrower than the circuit shown in Figure 15 B.

Use narrower circuit to increase the wiring density in the wiring channel of given width.Wideer circuit is favourable, reduces with the line width increase because insert loss.Circuit can have the width in about 100-300 mu m range, preferably in the scope of about 100-200 μ m.

In the instance shown in Figure 16 B, five pairs of circuits can be routed between the adjacent vias row.In the conductor instance with four row, it is right that wherein each shows five signals, and on wiring density, increasing by 25% (that is, per four have a pair of extra wiring route) meaning person only needs two flaggies, rather than three.As stated, reduce flaggy quantity and help to reduce capacitance, thereby increase impedance.Reduce the needs that flaggy quantity can also reduce or eliminate the back drill of via hole.

According to the present invention, can revise according to the embodiment shown in Figure 17-21 in any via arrangement shown in Figure 14 B, 15B and the 16B, to improve the wiring density and the electrical property of connector/substrate system.

Figure 17 shows a kind of partial view of connector basal surface, and it comprises first couple of signal conductor via hole S ₁And S ₂, and second couple of signal conductor via hole S ₃And S ₄Via hole S ₁And S ₂It is right to constitute first differential wave, signal conductor via hole S ₃And S ₄It is right to constitute second differential wave.As shown in, via hole can be arranged in the linear array.

At signal conductor via hole S ₁And S ₂Between spacing E ₁And at signal conductor via hole S ₃And S ₄Between spacing E ₃Each can be less than at signal conductor via hole S ₂And S ₃Between spacing E ₂Same, at signal conductor via hole S ₁With earthing conductor via hole G ₁Between spacing E, and at signal conductor via hole S ₄With earthing conductor G ₂Between spacing E ₄Can be less than spacing E ₂Usually, spacing E, E ₁, E ₃And E ₄Can be same to each other or different to each other.Can select actual range E, E ₁, E ₂, E ₃And E ₄,, optimize signal transmission performance simultaneously with through better impedance matching with crosstalk and reduce to realize the wiring density of expecting.

Figure 18 shows the partial view of a kind of optional embodiment of connector basal surface, and it comprises two earthing conductor via hole G ₁And G ₂, and four signal conductor via hole S ₁, S ₂, S ₃And S ₄Shown in figure 18, signal conductor via hole S ₁, S ₂, S ₃And S ₄Can be staggered against each other along center line C, via hole is arranged along center line.In other words, for example, signal conductor via hole S ₁And S ₃Can be with respect to center line C offset distance B on first direction ₁, signal conductor via hole S ₂And S ₄Can go up in the opposite direction with respect to center line C offset distance B with first party ₂Side-play amount B ₁Can with side-play amount B ₂Identical or different.As shown in, earthing conductor via hole G ₁And G ₂Can be positioned on the center line C.Therefore, signal conductor via hole S ₁, S ₂, S ₃And S ₄Can be come against each other staggered in such a way: make its with respect to respectively with signal conductor via hole S ₁And S ₄Adjacent earthing conductor via hole G ₁And G ₂Symmetry.Can select actual range B ₁And B ₂,, optimize signal transmission performance simultaneously with through better impedance matching with crosstalk and reduce to realize the wiring density of expecting.

Usually, spacing F, F ₁, F ₂, F ₃And F ₄Can be same to each other or different to each other.Can select actual pitch F, F ₁, F ₂, F ₃And F ₄With through better impedance matching with crosstalk and reduce to realize the wiring density of expecting, optimize signal transmission performance simultaneously.Also desired distance F, F ₁, F ₂, F ₃And F ₄Sum can be less than shown in Figure 17 apart from E, E ₁, E ₂, E ₃And E ₄Sum realizes identical electrical property to arrange for identical connector lead-in wire.

Figure 19 shows a kind of partial view of example embodiment of connector basal surface, and it comprises two earthing conductor via hole G ₁And G ₂, and four signal conductor via hole S ₁, S ₂, S ₃And S ₄Shown in figure 19, signal conductor via hole S ₁, S ₂, S ₃And S ₄Can be staggered against each other along center line C, via hole is arranged along center line.In other words, for example, signal conductor via hole S ₁And S ₃Can be with respect to center line C offset distance B on first direction ₁, signal conductor via hole S ₂And S ₄Can go up in the opposite direction with respect to center line C offset distance B with first party ₂Side-play amount B ₁Can with side-play amount B ₂Identical or different.

Earthing conductor via hole G ₁And G ₂Also can squint with respect to center line C.Earthing conductor G ₁Can be with respect to center line C offset distance B ₃, and can with signal conductor via hole S ₂And S ₄The offset direction is identical.Earthing conductor G ₂Can be with respect to center line C offset distance B ₄, and can with signal conductor via hole S ₁And S ₃The offset direction is identical.Usually, bias B ₁, B ₂, B ₃And B ₄Can be same to each other or different to each other.As shown in, via hole can be come against each other staggered in such a way: make it symmetrical with respect to center line C.Can select actual range B ₁, B ₂, B ₃And B ₄,, optimize signal transmission performance simultaneously with through better impedance matching with crosstalk and reduce to realize the wiring density of expecting.

Usually, spacing H, H ₁, H ₂, H ₃And H ₄Can be same to each other or different to each other.Can select actual range H, H ₁, H ₂, H ₃And H ₄,, optimize signal transmission performance simultaneously with through better impedance matching with crosstalk and reduce to realize the wiring density of expecting.Also desired distance H, H ₁, H ₂, H ₃And H ₄Sum can be less than shown in Figure 19 apart from F, F ₁, F ₂, F ₃And F ₄Sum realizes identical electrical property to arrange for identical connector lead-in wire.

Figure 20 shows a kind of partial view of connector basal surface, comprises a plurality of pad P, and it is arranged as corresponding with the arrangement of the end portion (not shown) that will be gone between by the electric connector that substrate holds.Substrate can also comprise a plurality of via hole V that are arranged in two pairs of column units.As shown in, each column unit can comprise two couples of signal conductor via hole S and two earthing conductor via hole G.Each via hole V is electrically connected to pad P separately.Via hole V can be with respect to via hole row center line C skew, as combining the explanation of Figure 19.

Shown in figure 20, and row in adjacent vias or between distances when compared, the spacing between the adjacent columns unit can be bigger.Therefore, owing to it allows extra circuit T _VBe arranged between the adjacent columns unit, therefore connector basal surface shown in Figure 20 can improve wiring density.

Figure 21 illustrates a kind of partial view of example embodiment of connector basal surface, and it comprises two earthing conductor via hole G ₁And G ₂, and four signal conductor via hole S ₁, S ₂, S ₃And S ₄Shown in figure 21, signal conductor via hole S ₁, S ₂, S ₃And S ₄Can be staggered with respect to center line C, via hole is arranged along center line C.In other words, signal conductor via hole S for example ₁And S ₂Can be with respect to center line C offset distance B on first direction ₁, signal conductor via hole S ₃And S ₄Can go up in the opposite direction with respect to center line C offset distance B with first party ₂Side-play amount B ₁Can with side-play amount B ₂Identical or different.As shown in, earthing conductor via hole G ₁, G ₂Can be positioned on the center line C.Therefore, signal conductor via hole S ₁, S ₂, S ₃And S ₄Can be come in such a way to squint against each other: make it symmetrical with respect to the earthing conductor via hole.

Usually, spacing I, I ₁, I ₃And I ₄Can be same to each other or different to each other.At signal conductor S ₁With earthing conductor G ₂Between spacing I ₄Can be greater than arbitrary spacing I, I ₁, I ₂And I ₃Can select actual range I, I ₁, I ₂, I ₃And I ₄,, optimize signal transmission performance simultaneously with through better impedance matching with crosstalk and reduce to realize the wiring density of expecting.

Figure 22 A and 22B show the basal surface of typical prior art, and wherein, via arrangement is arranged identical with pad.In other words, for example via hole V can be arranged as row and column, as SMT pad P being arranged as row and column.In addition, the line space P of via arrangement _VRWith column pitch P _VCThe line space P that can arrange with pad _RWith column pitch P _CIdentical.As shown in, adjacent vias row are staggered by against each other.

Figure 23 A and 23B show the basal surface shown in Figure 22 A and 22B, but through signal specific is revised redirecting to different via holes.Shown in Figure 23 B, what wiring can be with shown in Figure 22 B is identical, but circuit can send various signals.In the basal surface shown in Figure 23 C, can make circuit enough narrow, so that two pairs of circuits can connect up in the wiring channel between adjacent columns, rather than having only shown in Figure 22 B and 23B is a pair of.

Figure 24 A and 24B show a basal surface, and it provides the wiring of double density, and wherein adjacent signals is to being split in the different via hole row.As shown in, via hole row can be the twices of pad row.Via hole line space P _VRCan with pad rows spacing P _RIdentical, via hole column pitch P _VCCan be pad column pitch P _CHalf the.Therefore, although the wiring channel between the adjacent vias row can have only a half-breadth, this wiring channel of twice can be arranged.Therefore, a pair of circuit T that can in every passage, connect up, rather than quantitatively be half the interior the wiring two pairs of every passage.Therefore, wiring density does not change.Yet, with these to separating to such an extent that fartherly help to improve signal integrity.Optional, this structure can be regarded as and squint with respect to adjacent lines one or more via holes are capable.Shown in Figure 24 B, for example left several the 4th via holes are capable of the pad column pitch P that squinted from left number the third line _CHalf the.

Figure 25 A and 25B show a kind of basal surface, and it provides 1.5 times wiring density.As shown in, first via hole row (for example, uppermost via hole row shown in Figure 25 B) can with second via hole row (for example, from last several second via hole row), first via hole column pitch P separately _V1The direction that second via hole row can extend along row with respect to the first via hole line skew apart from O _VSecond via hole row can separate the second via hole column pitch P with the 3rd via hole row (for example, from last several the 3rd via hole row) _V2, it is greater than the first via hole column pitch P _V1Like this, can between first via hole row and second via hole row, (have column pitch P by the wiring channel of formation article one relative narrower _V1), and can between second via hole row and the 3rd via hole row, (have column pitch P by the wiring channel of the relative broad of formation second _V2).Can be along the first wiring channel a pair of circuit T that connects up.Can be along two couples of circuit T of second wiring channel wiring.Like this, this arrangement provides two adjacent wirings passages, and it combines is that three pairs of circuits provide wiring space.

Figure 26 A and 26B show a kind of basal surface, and it provides 1.5 times wiring density.As shown in, first via hole row (for example, uppermost via hole row shown in Figure 26 B) can with second via hole row (for example, from last several second via hole row), first via hole column pitch P separately _V1Second via hole row can be with respect to the first via hole line skew apart from O _VSecond via hole row can separate the second via hole column pitch P with the 3rd via hole row (for example, from last several the 3rd via hole row) _V2, it is greater than the first via hole column pitch P _V1Like this, shown in Figure 26 B, can between the second and the 3rd via hole row, form wiring channel, the wiring of the enough three pairs of circuits of its width.Therefore, replace can both connect up two wiring channels of a pair of circuit of each bar, this arrangement provides single wiring channel, its three pairs of circuits that can connect up.

Figure 27 A and 27B show a kind of basal surface, and it provides crooked wiring.As shown in, first via hole row (for example, uppermost via hole row shown in Figure 27 B) can with second via hole row (for example, from last several second via hole row), first via hole column pitch P separately _V1First via hole capable (for example, the leftmost via hole shown in Figure 27 B is capable) can capable with respect to second via hole (for example, several second via hole be capable from a left side) distance of skew, as shown in, this distance can with via hole column pitch P _V1Identical.Second via hole row can separate the second via hole column pitch P with the 3rd via hole row (for example, from last several the 3rd via hole row) _V2, it is greater than the first via hole column pitch P _V1Adjacent lines can be interlocked.In other words, first row can be with respect to adjacent lines offset distance O.As shown in, each the third line is squinted.Like this, shown in Figure 27 B, can between the second and the 3rd via hole row, form crooked wiring channel.Can arrange the circuit T of one or more bending along the wiring channel of bending.

Figure 28 A and 28B show a kind of basal surface, and it provides the wiring of double density.As shown in; (for example be listed as with formation first pad; Uppermost pad row shown in Figure 28 A) the via hole V that SMT pad P is associated; And can be arranged in the single via hole row with via hole V that the pad P that constitutes second pad row adjacent with first pad row (for example, from last several second pad row) is associated, it can be arranged between first and second pads row.Therefore, there is not via hole need be arranged between second pad row and the 3rd pad row adjacent with second pad row.

As shown in, pad row can distance of separation P _CPad rows can distance of separation P _RThe via hole row can distance of separation P _VC, it can be approximated to be pad column pitch P _CTwice.Via hole is capable can distance of separation P _VR, it can be approximated to be pad rows spacing P _RHalf the.Therefore, shown in Figure 28 B, can between the second and the 3rd via hole row, form wiring channel, the wiring of the enough four pairs of circuits of its width.Therefore, substitute can connect up two wiring channels of a pair of circuit of each bar, the single wiring channel of the four pairs of circuits that can connect up can be provided.

Shown in Figure 28 B, notice and whenever can delete a ground connection via hole at a distance from two pairs of signal conductor via holes.Like this, this arrangement provides (comprising an earthing conductor via hole and two pairs of adjacent signal conductor via holes in this each through-hole unit) between adjacent vias unit wiring channel.As shown in, the adjacent vias unit can distance of separation P _VR2, it can be about via hole line space P _VRTwice.

Shown in Figure 28 C, can be so that circuit T be enough narrow so that can be in the wiring channel between the adjacent vias row five couples of circuit T of wiring, rather than shown in Figure 28 B, have only four pairs.Like this, can realize 2.5 times wiring density.

Figure 29 A and 29B show the instance of connector basal surface, wherein, and pad P _S, P _GBe arranged as a plurality of row, via hole V _S, V _GBe couple to pad P _S, P _G, and be arranged as a plurality of row.Show two row pad P _S, P _G, each provisional capital is signal-signal-ground structure.Hatched circle is represented ground pad P _G, the circle expression signal pad P of perforate _SThe signal pad P of delegation _SCan with the signal pad P of adjacent lines _SAlignment (that is, in same column), but the position displacement that for example also can squint.Equally, the ground pad P of delegation _GCan with another row ground pad P _GAlignment.Like this, the signal of delegation and ground pad P _S, P _GCan be respectively and the signal and the ground pad P of another row _S, P _GVertical alignment.

Each pad P _S, P _GCan be couple to corresponding via hole V through circuit T _S, V _GVia hole V _S, V _GCan vertical arrangement, promptly be arranged in row.Via hole V _S, V _GCan be located at two row pad P _S, P _GBetween interior zone IA in and/or can be arranged in perimeter OA, perimeter OA is in a side and the delegation adjacent areas relative with interior zone IA.Via hole row can stride across this two pad rows and extend, and comprise and the via hole that is associated at this two pad in capable.Preferably be arranged as a plurality of row side by side, normally parallel with the via hole that pad is associated.The via hole V of each row _S, V _GIt can be signal-signal-ground structure.Draw hatched via hole and represent ground connection via hole V _G, do not have the via hole expression signal via hole V of hatching _SVia hole V _S, V _GAdjacent columns can interlock so that one row in each ground connection via hole V _GAll with adjacent columns in signal via V _SAdjacent.Like this, each row via hole V _S, V _GCan be signal-signal-ground structure, but ground connection via hole V _GCan be with respect to the ground connection via hole V in the adjacent columns _GStaggered.Therefore circuit T can connect up in such a way: the ground connection via hole V that will interlock in will being listed as _GBe couple to ground pad P not staggered in the row _GThe line construction of Figure 29 can be by the not staggered pad P of two row _S, P _GProduce the staggered via hole V of four row _S, V _GThis has caused the increase of wiring space between the via hole vertical row.Be appreciated that also and can correspondingly adjust the arrangement of pad and via hole for single-ended signal transmission designs embodiments of the invention.

The via structure that it should be noted that Figure 29 has shown and is striding across the staggered via hole V of four row _S, V _GDiagonal on linearly aligned ground connection via hole V _GArrangement.This diagonal is arranged and is represented with dotted line g.At ground connection via hole V _GEach diagonal linear array between can be signal via V _SDiagonal capable.Signal via V _SDiagonal arrange and to represent with dotted line s1 and s2.However, it should be understood that can design replacement arranges, and provides ground connection via hole V _GWith respect to interlocking of adjacent vias row.

Via hole V _SAnd V _GIn Figure 29, being shown linear array is a plurality of row, and signal via and ground connection via hole constitute each signal-signal-ground unit, and it is along column direction spaced at equal intervals each other.Yet,, can arrange the interval and the relative position of via hole based on previous embodiment for line layout and the electrical characteristics that hope obtains.For example, the relative spacing between the via hole can be as shown in Fig. 2 B, in the distance between the signal via less than the distance between ground connection via hole and next adjacent signals via hole.Similarly, via hole can arranging shown in Fig. 3 B or 4B, and signal via is with respect to row center line lateral shift.

In optional embodiment, pad P _S, P _GCan couple mutually with the electroplating ventilating hole row, at this, electroplating ventilating hole has and via hole V _S, V _GThe cross structure of structural similarity.Optional, signal pad P _SCan be couple to signal via V _S, ground pad P _GCan be couple to the ground connection electroplating ventilating hole, and vice versa.

Figure 29 B shows a kind of like this pad and arranges, and for example it can be suitable for the application of SMT edge card.In the embodiment shown, be suitable on the arrangement theory of pad differential to edge card connector.Two connector ends that transmit differential wave can terminate to adjacent pad P _S, these pads are to passing through ground pad P _GWith adjacent pad to separating.

Figure 30 A shows two couples of signal conductor via hole S, these between arranged ground connection via hole G _SThese are right to being differential wave.Via hole is arranged as linear array along center line C.Each via hole perforate can be approximately uniform size.Figure 31 B shows two couples of signal conductor via hole S, these between arranged relatively large ground connection via hole G _LShown in Figure 30 B, the perforate of ground connection via hole can be greater than any signal via perforate.

Figure 31 A shows two couples of signal conductor via hole S, these between arranged ground connection via hole G _SThese are right to being differential wave.Via arrangement is two adjacent columns, and with distance P _VCSeparate.These row are each other with apart from O _VRelativity shift.Shown in Figure 31 A, each via hole perforate can be approximately uniform size.Figure 31 B shows two couples of signal conductor via hole S, these between arranged relatively large ground connection via hole G _LShown in Figure 31 B, the perforate of ground connection via hole can be greater than any signal via perforate.

The perforate of ground connection via hole is big more, and crosstalking between the signal conductor via hole is just more little.Figure 32 A and 32B are that various ground connection via hole bore size provide differential impedance and the curve chart instance of crosstalking respectively.Data be for the signal via perforate with about 0.5mm diameter, and about 0.5,0.9 and the basal surface of the ground connection via hole perforate of 1.3mm diameter collect.The influence visible by Figure 32 A, that differential impedance (that is, in the impedance that constitutes between the right signal via of differential wave) is not changed by ground connection via hole bore size comparatively speaking.Can be visible by Figure 32 B, along with the increase of ground connection via hole opening diameter, crosstalk performance is significantly improved.

Several embodiment of the basal surface definition that is used for SMT base plate and edge card application like this, have just been described.Should be understood that previous embodiment only for the purpose of explaining provides, is interpreted as restriction of the present invention anything but.For example, described previous exemplary embodiment, can anticipate although combine to comprise the via arrangement of earthing conductor via hole and signal conductor via hole, according to principle of the present invention, the arrangement that can be fit to for the connector design that only has signal contact.Similarly; Although right via arrangement has been described previous exemplary embodiment in conjunction with comprising differential wave; But can anticipate; According to principle of the present invention, can be for only having the connector of single-ended signal conductor, and for having the arrangement that differential wave is fit to the connector design with the single-ended signal conductor combination.In addition, it will be appreciated that and to use above-mentioned notion separately, perhaps with above-mentioned arbitrarily another notion is combined uses.

Claims

1. circuit board that is used to hold electric assembly, said circuit board comprises:

Substrate; And

First, second and the 3rd conductive via arrange that along array centerline said array centerline is extended along first direction, and each of said via hole all extends in the said substrate,

Wherein, (i) said first and second via holes formation differential wave is right; (ii) said first and second via holes are separated from each other with first distance along said first direction, and (iii) said the 3rd via hole is the ground connection via hole, and (iv) said the 3rd via hole is adjacent with said first via hole; (the v) said first and the 3rd via hole is separated from each other with second distance along said first direction, and (vi) said second distance is different with said first distance.

2. circuit board as claimed in claim 1; Wherein, (i) said first via hole on second direction with respect to said array centerline the 3rd distance that squints; Said second direction is vertical with said first direction, and (ii) said second via hole on third direction with respect to said array centerline the 4th distance that squints, said third direction is opposite with said second direction.

3. circuit board as claimed in claim 2, wherein, said third and fourth distance equates.

4. circuit board as claimed in claim 2, wherein, (i) with respect to said array centerline the 5th distance that squints, and (ii) said the 5th distance is greater than said the 3rd distance on said third direction for said the 3rd via hole.

5. circuit board as claimed in claim 1; Also comprise the 4th conductive via; Along said array centerline and the said second via hole arranged adjacent; Wherein, (i) the said second and the 4th via hole is separated from each other with the 3rd distance along said first direction, and (ii) said the 3rd distance is different with said first distance.

6. circuit board as claimed in claim 5, wherein, the said second and the 3rd distance equates.

7. circuit board as claimed in claim 5; Wherein, (i) said first via hole on second direction with respect to said array centerline the 4th distance that squints; Said second direction is vertical with said first direction, and (ii) said second via hole on third direction with respect to said array centerline the 5th distance that squints, said third direction is opposite with said second direction.

8. circuit board as claimed in claim 7, wherein, the said the 4th and the 5th distance equates.

9. circuit board as claimed in claim 1 also comprises:

Four, the 5th and the 6th conductive via arranges that along second array centerline said second array centerline is parallel to said first array centerline and extends,

Wherein, (i) to constitute second differential wave right for the said the 4th and the 5th via hole; The the (ii) said the 5th and the 6th via hole is separated from each other with said first distance along said first direction; (iii) said the 6th via hole is the ground connection via hole, and (iv) said the 6th via hole is adjacent with said the 4th via hole, and (the v) said the 4th and the 6th via hole is separated from each other with said second distance along said first direction; (vi) said second array squints with respect to said first array on said first direction, and (vii) said second array is not more than said second distance with respect to said first array skew on said first direction.

10. circuit board as claimed in claim 1 also comprises:

Four, the 5th and the 6th conductive via is arranged along said array centerline,

Wherein, (i) to constitute second differential wave right for the said the 4th and the 5th via hole, and (ii) said the 4th via hole is adjacent with second via hole, and (iii) said the 5th via hole is adjacent with said the 4th via hole,

(iv) said the 6th via hole is adjacent with said the 5th via hole; (the v) said the 4th and the 5th via hole is separated from each other with said first distance along said first direction; (the vi) said the 5th and the 6th via hole is separated from each other with said second distance along said first direction; (the vii) said second and the 4th via hole is separated from each other with the 3rd distance along said first direction, and (viii) said the 3rd distance is greater than said first distance.