US20070096273A1 - Reduction of Electromagnetic Interference in Integrated Circuit Device Packages - Google Patents
Reduction of Electromagnetic Interference in Integrated Circuit Device Packages Download PDFInfo
- Publication number
- US20070096273A1 US20070096273A1 US11/551,712 US55171206A US2007096273A1 US 20070096273 A1 US20070096273 A1 US 20070096273A1 US 55171206 A US55171206 A US 55171206A US 2007096273 A1 US2007096273 A1 US 2007096273A1
- Authority
- US
- United States
- Prior art keywords
- magnetic material
- electrically conductive
- integrated circuit
- conductive paths
- wafer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/50—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor for integrated circuit devices, e.g. power bus, number of leads
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/552—Protection against radiation, e.g. light or electromagnetic waves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
- H01L23/585—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries comprising conductive layers or plates or strips or rods or rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/1517—Multilayer substrate
- H01L2924/15172—Fan-out arrangement of the internal vias
- H01L2924/15173—Fan-out arrangement of the internal vias in a single layer of the multilayer substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
Abstract
EMI radiation in an integrated circuit device package (10) is reduced or eliminated by the introduction of a magnetic material into the encapsulating medium (14). The permeance of the magnetic encapsulating medium (14) affects the inherent series inductance of the lead frame conductors (16) to thereby reduce electromagnetic interference. Ferrite microbeads (30) are formed around the lead frame conductors (16) to contain the magnetic flux (32) generated by an electrical current signal and to attenuate the effects of mutual inductance.
Description
- This application is a division of U.S. application Ser. No. 10/684,072 filed Oct. 13, 2003, which a division of U.S. application Ser. No. 10/040,256 filed Dec. 31, 2001, which is a division of U.S. application Ser. No. 09/068,685 filed May 13, 1998, which was the National Stage of International Application No. PCT/US 96/17916 filed Nov. 15, 1996, published in English as WO 97/18586 dated May 22, 1997, which claimed the benefit of U.S. Provisional Application No. 60/006,755 filed Nov. 15, 1995.
- The present invention relates generally to reduction of electromagnetic interference and specifically to reduction of electromagnetic interference generated within an integrated circuit device package.
- Advents in the performance of microcomputer based electronics have resulted in dramatic increases in operating speeds of the logic switching circuits. Increased switching and operating speeds correspond to increased bandwidths of the electronic signals transmitted within the interior of an electronic device which become a significant source for electromagnetic radiation causing interference with the internal circuitry of the device itself and with other electronic devices operating within the vicinity of the device. The electromagnetic radiation emitted at these higher frequencies may cause undesirable electromagnetic coupling between data paths resulting in cross channel interference.
- The amount of internally generated electromagnetic radiation must be limited to the guidelines and regulations set by governmental agencies such as the FCC in the United States and CISPR in European countries. Sources of electromagnetic radiation originating externally to the device may also affect and interfere with the operation of the device. In general the problems resulting form unwanted electromagnetic radiation are classified as electromagnetic interference (EMI).
- A recurring observation in the analysis of EMI performance in products that use VLSI integrated circuits is that there is a significant amount of emission radiated directly from the integrated circuit package itself before the signal connections from the device are available on an external pin. This is particularly evident in devices that have a large number of pins, such as a common 208 pin Quad Flat Pack (QFP) device. A 208 pin QFP device is typically on the order of 1 inch square with the actual integrated circuit itself occupying only a small amount of the real estate of the QFP package. Typically, the integrated circuit (IC) is relatively small being on the order of 0.2 square winches to 0.3 square inches. As a result, there must be internal conductor leads from the IC silicon wafer to the external pins of the device. This is typically implemented with a lead frame of metal strips etched or stamped from a sheet of material to support the integrated circuit chip and to provide a signal path for the input and output (I/O) pins of the QFP device.
- In such a design there may be a significant conductor length from the IC itself through the bonding wires and the lead frame conductors to the external pins of the device. This is especially true for pins at or near the corner of the device, in which case the conductor lead length may be well over 0.5 inch.
- The described physical lead lengths in typical integrated circuit packaging designs generally cause two problems. The problem is mid and high frequency signal degradation introduced by the inherent series inductance of the conductor leads which is particularly a problem for the power and ground feeds. The second problem is that the conductor leads may radiate EMI energy as an antenna thereby interfering with the signals an adjacent conductor leads in the package and with other signal paths and components in the electronic device in which the integrated circuit is utilized. The techniques known in the art for reducing electromagnetic interference are effective only external to the integrated circuit device package. Thus, there lies a need for a method and apparatus to reduce or eliminate electromagnetic radiation internal to the integrated circuit device package itself.
- The present invention provides reduction and elimination of electromagnetic radiation in an integrated circuit. The electromagnetic radiation is reduced or eliminated, and electrical signals internal to the integrated circuit package are conditioned internally within the integrated circuit package itself.
- The numerous objects and advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying figures in which:
-
FIG. 1 is a somewhat diagrammatic representation of the internal design of a typical integrated circuit package; -
FIG. 2 is a schematic illustration of the electrical model of a typical integrated circuit device package; -
FIG. 3 is a somewhat schematic illustration of the electrical model of an integrated circuit device package utilizing the present invention; -
FIG. 4 illustrates the resulting characteristic curve of the electrical signals conditioned by the present invention; -
FIG. 5 is a schematic elevation view of an integrated circuit device package of the present invention illustrating the magnetic flux pattern occurring therein; -
FIG. 6 is a somewhat diagrammatic representation of the internal design of an integrated circuit device package utilizing the present invention; -
FIG. 7 is a schematic elevation view of an integrated circuit device package of a preferred embodiment of the present invention illustrating the magnetic flux pattern occurring therein; -
FIG. 8 is a somewhat diagrammatic representation of the internal design of an integrated circuit device package utilizing a preferred embodiment of the present invention; and -
FIG. 9 is an electrical schematic diagram of the equivalent circuit model of a preferred embodiment of the present invention. -
FIG. 1 illustrates the model of a typical Quad Flat Pack (QFP) integrated circuit device. The Quad Flat Pack may comprise a 1.0 inch square integratedcircuit device package 10. The integrated circuit (IC) 12 itself may only comprise a 0.2 inch square or 0.3 inch square wafer of silicon containing the actual integrated circuitry of theintegrated circuit package 10. Thedevice package 10 is formed by encapsulating theintegrated circuit 12 in aplastic medium 14 which defines the physical dimensions of thedevice package 10. Theplastic medium 14 protects and supports theintegrated circuit 12 and contains thelead frame conductors 16 which electrically connect theIC 12 to the external input/output (I/O)pins 18 of thedevice package 10. Thelead frame conductors 16 connect to the IC 12 viabonding wires 20 which directly connect to strategic circuitry nodes on theIC 12. -
FIG. 2 illustrates the electrical model of the typical integrated circuit package ofFIG. 1 .FIG. 2 illustrates how thelead frame conductors 16 from the I/O pins 18 to the integratedcircuit 12 are not ideal transmission lines but in practice exhibit a per length series inductance. Longer lengths of thelead frame conductors 16 result in larger values of the inherent series inductance. Input leads of thelead frame conductors 16 connect theinput pins 18 IN of the I/O pins 18 to input buffers such as 22 on theintegrated circuit 12, and output leads of thelead frame conductors 16 connect theoutput pin 18 OUT of the I/O pins 18 to output buffers such as 24 on theintegrated circuit 12. In general, the input and output conductor leads of thelead frame conductors 16 exhibit input series inductance LIN and output series inductance LOUT. - Ideally, the inductance of the VCC and VGND leads would be zero henries. In a preferred embodiment of the present invention the effective inductance of the VCC and VGND leads is effectively reduced with multiple parallel branches since there are typically multiple VCC and VGND pins in a given integrated
circuit device package 10. Utilization of multiple signal paths to reduce the effective inductance of a data signal path provided by alead frame conductor 16 is not feasible; therefore the effective series inductances LIN and LOUT of thelead frame conductors 16 preferably exhibit a small amount of “lossy” inductance. By making the series inductance oflead frame conductors 16 lossy, the detrimental EMI effects of the series inductances may be thereby reduced. - Given the construction of the lead frame which provides the
lead frame conductors 16, the packaging function for the integratedcircuit 12 is preferably completed by placing the lead frame with bonded integratedcircuit 12 into an injection molding cavity where molten plastic is injected to encapsulate the lead frame and integratedcircuit 12 to form thedevice package 10. Theplastic material 14 is preferably electrically passive and electrically non-conducting so that it will cause no degradation of the electrical signals to and from the integratedcircuit 12. - In a preferred embodiment of the present invention a modeled
plastic material 14 having desired electromagnetic properties to advantageously affect the signals to and from the integratedcircuit 12 as the signals are routed through thelead frame conductors 16 of the device is utilized. A small amount of ferrite powder is preferably blended with theplastic material 14 to achieve the slightly lossy magnetic characteristic of the encapsulatingplastic medium 14 surrounding thelead frame conductors 16. Ferrite is preferred because of its high resistivity and permeability. -
FIG. 3 illustrates the effects of the introduction of ferrite powder into the encapsulating plastic of the integrated circuit device package ofFIG. 1 . The introduction of a ferrite material into theencapsulating plastic 14 alters the permeance of theencapsulating medium 14 and thereby affects the electrical characteristics of the inherent series impedance of thelead frame conductors 16. The ferrite material in the encapsulatingmedium 14 causes the series inductance of thelead frame conductors lead frame conductors physical medium 14 surrounding the inductance with the presence of a magnetic material such as ferrite produces an effect opposite to the effect resulting with magnetic core inductors; instead of concentrating the magnetic flux within the center of the inductor to thereby augment the effective inductance as with a magnetic core, the increased permeance of the surroundingmedium 14 due to the magnetic material tends to distribute the flux throughout the medium away from the inductor thereby attenuating the effective inductance. -
FIG. 4 illustrates the resulting preferred characteristic signal shape of a given data signal when a ferrite material is introduced into the encapsulating medium. The lossy inductor LF as shown inFIG. 3 would serve to attenuate only the highest frequency signal components while introducing generally little true inductance effects of overshoot and ringing associated with the series inductance of thelead frame conductors 16 when no ferrite is present. The Q of the inherent series inductance of thelead frame conductors 16 is thereby minimized rather than maximized. Thus, the intentionally introduced inductor loss reduces the undesired effects of the inherent series inductance such as overshoot and ringing. -
FIG. 5 illustrates a two conductor mutual coupling model of the present invention. Introduction of mutual coupling and signal crosstalk between two adjacentlead frame conductors conductor 16A introducesmagnetic flux 32 throughadjacent conductor 16B thereby inducing a current therein. In a preferred embodiment of the present invention a relatively small amount of ferrite material is blended in the encapsulatingplastic 14 resulting in a relative permeability of the surroundingmaterial 14 that is not too high to cause significant mutual coupling but yet sufficient to desirably affect the series inductance of thelead conductors 16. In a preferred embodiment of the present invention, the relative permeability of the encapsulatingmedium 14 ranges from 5 to 10. - Regarding the two conductor mutual coupling example as shown in
FIG. 3 , the actual amount of mutual inductance MF between two adjacentlead frame conductors conductor 16. In a preferred embodiment of the present invention, the reduction of crosstalk on any particularlead frame conductor 16 may be further achieved by placing that particularlead frame conductor 16 adjacent to a VCC or VGND lead to avoid any coupling to another data signal path. -
FIG. 6 illustrates a preferred embodiment of the present invention in which mutual coupling between adjacent leads is eliminated. The virtual elimination of the mutual inductance may be achieved by molding thedevice package 10 in two steps. The first step preferably comprises constructing the lead frame which provideslead frame conductors 16 and then forming or molding individual ferrite “microbeads” 30 on eachlead frame conductor 16. Themicrobeads 30 are preferably offset so they do not interfere withadjacent microbeads 30. Themicrobead 30 are electrically isolated from the adjacentlead frame conductors 16. - In a preferred embodiment of the present invention the
microbeads 30 are made of pure ferrite material which may be constructed using known ceramic techniques, and themicrobeads 30 would be formed as an integral part of thelead frame 16. Themicrobeads 30 are utilized in a manner analogous to the utilization of ferrite bead chokes in radiofrequency transmission lines and antennas. The bead surrounds the transmission line and effectively chokes undesired high frequency signals immediately external to the transmission line that are the source of electromagnetic interference without affecting data signals passing therethrough. - The second step preferably comprises ordinary plastic encapsulation of the lead frame that provides
lead frame conductors 16 and theintegrated circuit 12 upon completion of the bonding and wiring of theIC 12 to the lead frame. In an alternative embodiment of the present invention the inclusion of aferrite microbead 30 on any givenlead frame conductor 16 is optional depending upon the type of signal transmitted thereon. For example, VCC and VGND signals perform better if there is noferrite bead 30 on those leads. In a preferred embodiment, the standard lead frame is constructed with amicrobead 30 on eachlead frame conductor 16.Microbeads 16 may be selectively removed by crushing away theundesired beads 30 which is facilitated by the inherent brittleness of ferrite. Preferably, a simple press may be utilized having small crushing pins arranged above the corresponding microbeads to be crushed in which allundesired microbeads 30 may be removed in a single step. -
FIG. 7 illustrates a preferred embodiment of the present invention in which the magnetic flux is contained within the ferrite beads. Theferrite bead 30 surroundingconductor 16A completely contains themagnetic flux 32 generated by the current flowing intoconductor 16A. Thus, no current is induced inconductor 16B from themagnetic flux 32 created by the current flowing throughconductor 16A. In a preferred embodiment of the present invention, only themicrobeads 30 contain ferrite wherein the encapsulatingmedium 14 entirely comprises nonmagnetic plastic. Alternatively, a small amount of ferrite may be blended in with the encapsulatingplastic 14 in conjunction with the utilization of ferrite beads to further achieve the reduction of electromagnetic interference. -
FIG. 8 illustrates the preferred placement of the ferrite beads of the present invention relative to the integrated circuit wafer in the device package. - The most effective physical location for the
microbeads 30 is as near to theintegrated circuit 12 as possible. With the required close spacing of thelead frame conductors 16 near theIC bonding pads 20, the physical size of amicrobead 30 may not be very large, however the effects of the reduced size are offset by the fact that the placement of theferrite microbead 30 near theIC 12 is nearly ideal. -
FIG. 9 illustrates the resulting electrical circuit model of a given conductor path in an integrated circuit device package of the present invention including anequivalent circuit model 16′ for representing a typicallead frame conductor 16. An output signal VOUT from the integratedcircuit 12 feeds into anoutput buffer 24 which is externally connected through an ICbonding wire pad 20. Thebonding wire 20 exhibits a small series inductance LB which is small relative to the inductance LF of theferrite microbead 30. Thelead frame conductor 16 exhibits a characteristic lumped series inductance LOUT and shunt capacitance COUT, the effects of which are negligible compared to the inductance LF of themicrobead 30, and extends through the encapsulatingmedium 14. The effects of inductance LOUT and capacitance COUT may be further reduced by the blending of ferrite with theencapsulation material 14. Thelead frame conductor 16 connects to anexternal pin 18 OUT on the exterior of thedevice package 10. - In view of the above detailed description of a preferred embodiment and modifications thereof, various other modifications will now become apparent to those skilled in the art. The contemplation of the invention below encompasses the disclosed embodiments and all reasonable modifications and variations without departing from the spirit and scope of the invention.
Claims (20)
1. An integrated circuit comprising:
a wafer having circuitry disposed thereon;
a plurality of conductors coupled to the wafer;
a structure that encapsulates and supports the wafer; and magnetic material disposed to alter an inductance associated with at least one of the plurality of conductors.
2. The integrated circuit of claim 1 , wherein the magnetic material is at least partially disposed within the structure.
3. The integrated circuit of claim 1 , wherein the magnetic material is substantially homogeneously disposed throughout the structure.
4. The integrated circuit of claim 1 , wherein at least a portion of the magnetic material is disposed external to the structure.
5. The integrated circuit of claim 1 , wherein the magnetic material comprises a ferromagnetic material.
6. The integrated circuit of claim 1 , wherein the magnetic material comprises a ferrite material.
7. The integrated circuit of claim 1 , further comprising at least one choke structure formed of the magnetic material, wherein each chock structure associates with at least one respective conductor of the plurality of conductors.
8. The integrated circuit of claim 1 , wherein the magnetic material forms a plurality of choke structures, each of the choke structures being associated with at least one respective conductor of the plurality of conductors
9. The integrated circuit of claim 7 , wherein the structure comprises a dielectric material encapsulating at least a portion of the choke structures.
10. The integrated circuit of claim 7 , wherein at least some of the choke structures are disposed external to the structure.
11. The method of reducing electromagnetic interference generated within an integrated circuit device package wherein the integrated circuit device package comprises
a wafer having wafer circuitry disposed thereon;
a plurality of conductors defining electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry; and
a structure that encapsulates and supports the wafer; said method comprising applying magnetic material that exhibits a lossy characteristic, in the vicinity of at least one of the electrically conductive paths such that the magnetic material is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, to attenuate the highest frequency signal components while introducing generally little inductance effects of overshoot and ringing associated with the series inductance of the at least one of the electrically conductive paths.
12. The method of claim 11 , wherein the structure that encapsulates and supports the wafer comprises an encapsulating medium, and said method further comprises introducing magnetic material that exhibits a lossy characteristic into the encapsulating medium such that the magnetic material is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, so as to cause the series inductance of the at least one of the electrically conductive paths to behave as a lossy inductor so as to attenuate the highest frequency signal components while introducing generally little inductance effects of overshoot and ringing.
13. The method of claim 12 , wherein a relatively small amount of magnetic material that exhibits a lossy characteristic, is introduced into the encapsulating medium such that the magnetic material is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, and so that the relative permeability in the vicinity of the at least one of the electrically conductive paths is not so high as to cause significant mutual coupling with other of the plurality of conductors.
14. The method of claim 13 , where the introduction of the relatively small amount of magnetic material that exhibits a lossy characteristic, such that the magnetic material is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, results in a relative permeability of the encapsulating medium that is sufficient to desirably affect the series inductance of the at least one of the electrically conductive paths.
15. The method of claim 13 , where the mutual inductance between the one of the plurality of electrically conductive paths and an adjacent conductor is small with respect to the self-inductance of each conductor.
16. The method of claim 11 , wherein the magnetic material that is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, is applied such that mutual coupling of the one of the plurality of electrically conductive paths and an adjacent conductor is substantially eliminated.
17. The method of claim 11 , where the magnetic material that exhibits a lossy characteristic and is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, substantially surrounds the one of the plurality of the electrically conductive paths and effectively chokes undesired high frequency signals immediately external to the at least one of the electrically conductive paths without substantially affecting data signals passing therethrough.
18. The method of claim 17 , where the structure that encapsulates and supports the wafer comprises an encapsulating medium that is substantially free of magnetic material.
19. The method of claim 17 , where the structure that encapsulates and supports the wafer comprises an encapsulating medium that contains a small amount of magnetic material that is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, to further achieve the reduction of electromagnetic interference.
20. The method of claim 17 , where the magnetic material that is not part of any of the electrically conductive paths for carrying all of the electric current flowing to and from the wafer circuitry, substantially surrounds the one of the plurality of electrically conductive paths, at the portion of such one electrically conductive path relatively near to the wafer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/551,712 US20070096273A1 (en) | 1995-11-15 | 2006-10-21 | Reduction of Electromagnetic Interference in Integrated Circuit Device Packages |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US675595P | 1995-11-15 | 1995-11-15 | |
PCT/US1996/017916 WO1997018586A1 (en) | 1995-11-15 | 1996-11-15 | Reduction of electromagnetic interference in integrated circuit device packages |
US6868598A | 1998-05-13 | 1998-05-13 | |
US10/040,256 US20020190389A1 (en) | 1995-11-15 | 2001-12-31 | Reduction of electromagnetic interference in integrated circuit device packages |
US10/684,072 US7125743B2 (en) | 1995-11-15 | 2003-10-13 | Method for reduction of electromagnetic interference in integrated circuit packages |
US11/551,712 US20070096273A1 (en) | 1995-11-15 | 2006-10-21 | Reduction of Electromagnetic Interference in Integrated Circuit Device Packages |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/684,072 Division US7125743B2 (en) | 1995-11-15 | 2003-10-13 | Method for reduction of electromagnetic interference in integrated circuit packages |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070096273A1 true US20070096273A1 (en) | 2007-05-03 |
Family
ID=26676023
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/040,256 Abandoned US20020190389A1 (en) | 1995-11-15 | 2001-12-31 | Reduction of electromagnetic interference in integrated circuit device packages |
US10/684,072 Expired - Fee Related US7125743B2 (en) | 1995-11-15 | 2003-10-13 | Method for reduction of electromagnetic interference in integrated circuit packages |
US11/551,712 Abandoned US20070096273A1 (en) | 1995-11-15 | 2006-10-21 | Reduction of Electromagnetic Interference in Integrated Circuit Device Packages |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/040,256 Abandoned US20020190389A1 (en) | 1995-11-15 | 2001-12-31 | Reduction of electromagnetic interference in integrated circuit device packages |
US10/684,072 Expired - Fee Related US7125743B2 (en) | 1995-11-15 | 2003-10-13 | Method for reduction of electromagnetic interference in integrated circuit packages |
Country Status (1)
Country | Link |
---|---|
US (3) | US20020190389A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7353092B2 (en) * | 2004-12-17 | 2008-04-01 | Honeywell International, Inc. | Support bridge for flexible circuitry |
DE102006058068B4 (en) * | 2006-12-07 | 2018-04-05 | Infineon Technologies Ag | Semiconductor component with semiconductor chip and passive coil component and method for its production |
US9543940B2 (en) * | 2014-07-03 | 2017-01-10 | Transphorm Inc. | Switching circuits having ferrite beads |
US9893025B2 (en) * | 2014-10-01 | 2018-02-13 | Analog Devices Global | High isolation wideband switch |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5138431A (en) * | 1990-01-31 | 1992-08-11 | Vlsi Technology, Inc. | Lead and socket structures with reduced self-inductance |
US5871625A (en) * | 1994-08-25 | 1999-02-16 | University Of Iowa Research Foundation | Magnetic composites for improved electrolysis |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2806328B2 (en) * | 1995-10-31 | 1998-09-30 | 日本電気株式会社 | Resin-sealed semiconductor device and method of manufacturing the same |
US6563299B1 (en) * | 2000-08-30 | 2003-05-13 | Micron Technology, Inc. | Apparatus for measuring parasitic capacitance and inductance of I/O leads on an electrical component using a network analyzer |
JP3645197B2 (en) * | 2001-06-12 | 2005-05-11 | 日東電工株式会社 | Semiconductor device and epoxy resin composition for semiconductor encapsulation used therefor |
-
2001
- 2001-12-31 US US10/040,256 patent/US20020190389A1/en not_active Abandoned
-
2003
- 2003-10-13 US US10/684,072 patent/US7125743B2/en not_active Expired - Fee Related
-
2006
- 2006-10-21 US US11/551,712 patent/US20070096273A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5138431A (en) * | 1990-01-31 | 1992-08-11 | Vlsi Technology, Inc. | Lead and socket structures with reduced self-inductance |
US5871625A (en) * | 1994-08-25 | 1999-02-16 | University Of Iowa Research Foundation | Magnetic composites for improved electrolysis |
Also Published As
Publication number | Publication date |
---|---|
US7125743B2 (en) | 2006-10-24 |
US20040075175A1 (en) | 2004-04-22 |
US20020190389A1 (en) | 2002-12-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5561265A (en) | Integrated circuit packaging | |
US5581122A (en) | Packaging assembly with consolidated common voltage connections for integrated circuits | |
JP3055488B2 (en) | Multilayer printed circuit board and method of manufacturing the same | |
JP3407971B2 (en) | Integrated circuit package and assembly structure thereof | |
WO2005117255A1 (en) | Filter circuit, logic ic, multi-chip module, filter-equipped connector, transmitting apparatus and transmitting system | |
US5677570A (en) | Semiconductor integrated circuit devices for high-speed or high frequency | |
KR970024046A (en) | High frequency, high density semiconductor chip package with shield bonding wire | |
JPS61205001A (en) | Transmission line | |
EP1047130B1 (en) | Radio frequency semiconductor apparatus | |
US20070096273A1 (en) | Reduction of Electromagnetic Interference in Integrated Circuit Device Packages | |
US20070268088A1 (en) | Stub-tuned wirebond package | |
EP1577947A1 (en) | Semiconductor device comprising an encapsulating material that attenuates electromagnetic interference | |
WO2005065336A2 (en) | High-frequency chip packages | |
US9455157B1 (en) | Method and apparatus for mitigating parasitic coupling in a packaged integrated circuit | |
US20050046046A1 (en) | Semiconductor package structure and method for manufacturing the same | |
US20010048155A1 (en) | Interchangeable bond-wire interconnects | |
WO1997018586A1 (en) | Reduction of electromagnetic interference in integrated circuit device packages | |
JPH0855949A (en) | Flat package | |
JP2007005477A (en) | Noise removal method by underfill | |
US6646343B1 (en) | Matched impedance bonding technique in high-speed integrated circuits | |
JP2759395B2 (en) | Semiconductor device | |
JP3278093B2 (en) | Semiconductor devices | |
JPH0595055A (en) | Semiconductor integrated circuit | |
US6414383B1 (en) | Very low magnetic field integrated circuit | |
JP3259217B2 (en) | Noise reduction package |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |