CN101483425B - Low power differential signal transmission apparatus - Google Patents
Low power differential signal transmission apparatus Download PDFInfo
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- CN101483425B CN101483425B CN 200810001356 CN200810001356A CN101483425B CN 101483425 B CN101483425 B CN 101483425B CN 200810001356 CN200810001356 CN 200810001356 CN 200810001356 A CN200810001356 A CN 200810001356A CN 101483425 B CN101483425 B CN 101483425B
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Abstract
The present invention discloses a low power differential signal transmission equipment which comprises switching electrical current device and differential signal generating device, wherein the differential signal generating device coupled to the switching electrical current device; the switching electrical current device receives the first input voltage and the second input voltage, and generates a plurality of reference electrical current according to the first input voltage and the second input voltage; the differential signal generating device is provided with a plurality of the first transistors, a plurality of the second transistors, the first output pressure end and the second output pressure end; conducting/closing status of the plurality of first transistors and the second transistors are controlled by a plurality of reference electrical current; the first output pressure end is used to output the first output pressure, the second output pressure end is used to output the second output pressure; the first output pressure and the second output pressure are determined by conducting/closing status of the plurality of transistors.
Description
Technical field
The present invention relates to a kind of differential signal transmission apparatus, and particularly relevant for a kind of lower powered differential signal transmission apparatus.
Background technology
For the acuity that promotes electronic component and save consumed power, adopt the differential input can be so that small amplitude is exaggerated, utilize the size of amplitude can be with Information hiding in this amplitude, and be used as information signal and send out.Traditional differential signal transmitter can normally operate during greater than 2.5V at supply voltage (VDD), but when supply voltage can be because the redundant space (headroom) of VDD direction cause losing efficacy not during less than 2V (for example using 1.8V in 0.18-μ m technique).This is because the limited conducting resistance (on-resistance) of PMOS transistor switch causes.Limited conducting resistance can cause the cross-pressure on the transistor and consume redundant space, therefore needs higher supply voltage could allow differential signal transmission apparatus operate normally.
As shown in Figure 1, Fig. 1 illustrates the circuit diagram of traditional differential signal transmission apparatus.This device 10 comprises current source 11,13, inverter switch circuit 12 and impedance 14, wherein, inverter switch circuit 12 has two exit point OUTP and OUTN, current source 11 is coupled to inverter switch circuit 12, inverter switch circuit 12 is coupled to current source 13, and the two ends of impedance 14 are respectively coupled to exit point OUTP and the OUTN of inverter switch circuit 12.
When the first input voltage VIN P is high level, and the second input voltage VIN N is when being low level, transistor 123 and 121 conductings, and transistor 120 and 124 cut-offs, therefore electric current can flow to impedance 14 from transistor 123, flows to transistor 121 again, and the formed differential voltage signal of exit point OUTP and OUTN just equal the to flow through electric current of impedance 14 is multiplied by the resistance value of impedance 14, at this moment, the voltage difference of exit point OUTP and OUTN be on the occasion of.
When the first input voltage VIN P is low level, and the second input voltage VIN N is when being high level, transistor 120 and 124 conductings, and transistor 121 and 123 cut-offs, therefore electric current can flow to impedance 14 from transistor 120, flows to transistor 124 again, and the formed differential voltage signal of exit point OUTP and OUTN just equal the to flow through electric current of impedance 14 is multiplied by the resistance value of impedance 14, at this moment, the voltage difference of exit point OUTP and OUTN is negative value.
As noted earlier, traditional differential signal transmission apparatus 10 can normally operate during greater than 2.5V at supply voltage (VDD), but might cause not this differential signal transmission apparatus to lose efficacy because of the redundant space of VDD direction during less than 2V when supply voltage.Therefore, in order to overcome this problem, US Patent No. 2004/0150434 provides a kind of differential signal transmission apparatus, and this device has lacked current source than the device 10 of Fig. 1, and therefore, redundant space can be reduced.The differential signal transmission apparatus that US Patent No. 2004/0150434 provides mainly is to utilize the reference current control circuit to produce the grid voltage of transistor switch, when wanting the turn-on transistor switch, then its grid is coupled to grid voltage, if then the transistorized grid voltage of its PMOS is pulled to VDD when wanting the "off" transistor switch or the grid voltage of nmos pass transistor is pulled to GND (earth point).
Please refer to Fig. 2, Fig. 2 has illustrated the circuit diagram of a kind of differential signal transmission apparatus 20 that US Patent No. 2004/0150434 provides.This device 20 comprises ON-OFF control circuit 21, reference current control circuit 30, switching circuit 22, differential signal output circuit 23, resistance 25 and differential amplifier 24.Wherein, switching circuit 22 is coupled to reference current control circuit 30 and ON-OFF control circuit 21, differential signal output circuit 23 is coupled to switching circuit 22, the two ends of resistance 25 are respectively coupled to two outputs of differential signal output circuit 23, and two inputs of differential amplifier 24 are respectively coupled to the two ends of resistance.
ON-OFF control circuit 21 is in order to provide switch controlling signal S1 and S2, reference current control circuit 30 is in order to produce the first reference voltage V1 and the second reference voltage V2, switching circuit produces cross-pressure according to switch controlling signal S1 and S2 in the two ends of the resistance 25 that joins at it, and differential amplifier 24 amplifies the cross-pressure at the two ends of resistance 25.
As shown in Figure 2, switching circuit 22 comprises switch 220,221,222,223,224,225,226 and 227.Wherein, switch 220,223,225 and 226 is controlled by control signal S2, and switch 221,222,224 and 227 is controlled by control signal S1.One end of switch 220 is in order to receive the first reference voltage V1, the other end of switch 220 is coupled to switch 221, one end of switch 222 is in order to receive reference two voltage V2, the other end of switch 222 is coupled to switch 223, one end of switch 224 is in order to receive the first reference voltage V1, the other end of switch 224 is coupled to switch 225, and an end of switch 226 is in order to receive the second reference voltage V2, and the other end of switch 226 is coupled to switch 227.
23 of differential signal output circuits comprise transistor 230,231,232 and 233, and transistor 230 and 232 is the PMOS transistor, and transistor 231 and 233 is nmos pass transistor.The grid of transistor 230 is coupled to switch 221 and 220, and the grid of transistor 231 is coupled to switch 222 and 223, and the grid of transistor 232 is coupled to switch 224 and 225, and the grid of transistor 233 is coupled to switch 227 and 226.
When control signal S2 is high level, when S1 is low level, switch 220,223,225 and 226 conductings, switch 221,222,224 and 227 cut-offs.At this moment, the grid voltage of transistor 230 is the first reference voltage V1, and the grid voltage of transistor 232 is VDD, and the grid voltage of transistor 231 is GND, and the grid voltage of transistor 233 is the second reference voltage V2.Produce the first reference voltage V1 by design reference current control circuit 30, the second reference voltage V2, then transistor 230 and 233 conductings, transistor 231 and 232 cut-offs, the electric current at resistance 25 two ends of flowing through this moment is served as reasons lower to the upper reaches, and the differential voltage that differential amplifier 24 amplifies is negative value.
When control signal S1 is high level, when S2 was low level, switch 220,223,225 and 226 can cut-off, and switch 221,222,224 and 227 is understood conductings.At this moment, the grid voltage of transistor 230 is VDD, and the grid voltage of transistor 232 is the first reference voltage V1, and the grid voltage of transistor 231 is the second reference voltage V2, and the grid voltage of transistor 233 is GND.Produce the first reference voltage V1 by design reference current control circuit 30, the second reference voltage V2, then transistor 231 and 232 conductings, transistor 230 and 233 cut-offs, the electric current at resistance 25 two ends of flowing through this moment is served as reasons upper toward dirty, the differential voltage that differential amplifier 24 amplifies on the occasion of.
Then please refer to Fig. 3, Fig. 3 illustrates the circuit diagram of reference current control circuit 30.As shown in Figure 3, this reference current control circuit 30 comprises operational amplifier 300, transistor 301,304,305, resistance 302,303 and current source 306.Wherein, transistor 304 and 305 couples, current source 306 couples with transistor 305, resistance 303 couples with transistor 304, resistance 302 couples with transistor 301 and resistance 303, the output of the grid of transistor 301 and operational amplifier 300 couples, and the positive and negative input of operational amplifier 300 is respectively coupled to resistance 302 and the common-mode voltage Vcm that presets. Transistor 304 and 305 is PMOS transistors, and transistor 304 and 305 forms current mirrors is enough to make the first reference voltage V1 of PMOS transistor turns with generation, and current source 306 provides an electric current I REF to current mirror, and transistor 304 can output current IREF/n.Transistor 301 is nmos pass transistors, and transistor 301, resistance 302 and operational amplifier 300 form negative feedback loop is enough to make the nmos pass transistor conducting with generation the second reference voltage V2.In brief, reference circuit 30 can produce the first reference voltage V1 and the second reference voltage V2, so that above-mentioned differential signal transmission apparatus 20 be high level at control signal S1, when S2 is low level, the magnitude of voltage of differential wave of output be on the occasion of, and be low level at control signal S1, when S2 is high level, the magnitude of voltage of the differential wave of output is negative value.
In addition, US Patent No. 6,927,608 provide another kind of differential signal transmission apparatus, this device mainly is to utilize the suitching type current source control circuit to produce the grid voltage of transistor switch, when wanting the turn-on transistor switch, then its grid is coupled to grid voltage, if then its grid is disconnected when wanting the "off" transistor switch, and utilize active or passive type to pull on/leave behind the grid that (activeor passive pull up/down) circuit accelerates transistor switch, and then allow this grid can reach its final value voltage.
Please refer to Fig. 4, Fig. 4 illustrates US Patent No. 6,927, the circuit diagram of the 608 a kind of differential signal transmission apparatus 40 that provide.This device 40 comprises current source 41, transistor 46,47, impedance circuit 45, suitching type current source control module 42, the first suitching type current source 43 and the second suitching type current source 44.Wherein, the first suitching type current source 43 is coupled to suitching type current source control module 42, impedance circuit 45 and transistor 46.The second suitching type current source 44 is coupled to suitching type current source control module 42, impedance circuit 45 and transistor 47.The two ends of impedance circuit 45 are respectively coupled to transistor 46 and 47.Current source 41 is coupled to transistor 46 and 47.
Suitching type current source control module 42 receives input voltage vin _ p and Vin_n, and produces control signal S1 and S2 according to input voltage vin _ p and Vin_n.The first suitching type current source 43 judges whether to produce reference current ID according to control signal S1, and the second suitching type current source 44 judges whether to produce reference current ID according to control signal S2.Impedance circuit 45 transfers differential voltage signal (being the voltage difference at Vout p and Vout_n two ends) in order to the electric current I D that it is flowed through. Transistor 46,47 is controlled by respectively input voltage vin _ p and Vin_n, and current source 41 provides a reference current ID.
When input voltage vin _ p is high level, when Vin_n was low level, the second suitching type current source 44 can produce reference current ID, transistor 46 conductings, transistor 47 cut-offs, reference current ID flow to Vout_n from end points Vout_p, and produces the differential voltage signal at impedance circuit.When input voltage vin _ p is low level, when Vin_n was high level, the first suitching type current source 43 can produce reference current ID, and transistor 47 conductings, transistor 46 cut-offs, reference current ID flow to Vout_p from end points Vout_n, and produces the differential voltage signal at impedance circuit.
Please refer to Fig. 5, Fig. 5 illustrates US Patent No. 6,927, the circuit diagram of the 608 another kind of differential signal transmission apparatus 50 that provide.This device 50 comprises current source 52, transistor 56,57, impedance circuit 55, suitching type current source control module 51, the first suitching type current source 53, the second suitching type current source 54, electric capacity 58 and common-mode voltage regulating circuit 59.Wherein, the first suitching type current source 53 is coupled to suitching type current source control module 51, impedance circuit 55 and transistor 56.The second suitching type current source 54 is coupled to suitching type current source control module 51, impedance circuit 55 and transistor 57.Two ends Vout_p and the Vout_n of impedance circuit 55 are respectively coupled to transistor 57 and 56.Current source 52 is coupled to transistor 56 and 57.Electric capacity 58 is coupled to impedance circuit 55.Common-mode voltage regulating circuit 59 is coupled to impedance circuit 55.
Suitching type current source control module 51 receives input voltage vin _ p and Vin_n, and produces control the first suitching type current source 53 and the second suitching type current source 54 generation reference current ID according to input voltage vin _ p and Vin_n.Impedance circuit 55 transfers differential voltage signal (being the voltage difference at Vout_p and Vout_n two ends) in order to the electric current I D that it is flowed through. Transistor 56,57 is controlled by respectively input voltage vin _ p and Vin_n, and 52 of current sources provide reference current ID.The reference current ID that common-mode voltage regulating circuit 59 provides in order to adjust current source 52 so that common mode voltage signal reach the magnitude of voltage wanting to reach.
Current source control module 51 comprises adjustable electric current mirror circuit 510, buffer 511, switch 512 and 513.Wherein, buffer 511 is coupled to current mirroring circuit 510, switch 512 and 513.Adjustable electric current mirror circuit 510 receives adjusts voltage Vadj, and produces grid reference voltage Vgs_ref to buffer 511 according to adjusting voltage Vadj.Buffer 511 exports grid reference voltage Vgs_ref to switch 512 and 513. Switch 512 and 513 is controlled by respectively input voltage vin _ p and Vin_n, and when input voltage vin _ p was high level, then grid reference voltage Vgs_ref can be output to the second suitching type current source 54; When input voltage vin _ n was high level, then grid reference voltage Vgs_ref can be output to the first suitching type current source 53.
Adjustable electric current mirror circuit 510 comprises amplifier 5101, current source 5100, transistor 5102 and 5103, wherein, current source 5100 is coupled to transistor 5102 and 5103, and transistor 5102 couples with transistor 5103, and amplifier 5101 is coupled to transistor 5102 and 5103.The first suitching type current source 53 comprises transistor 531 and active pulling on/pull down circuit 530, and wherein, the grid of transistor 531 and active pulling on/pull down circuit 530 couples active pulling on/pull down circuit 530 more in order to receive input voltage vin _ n.The second suitching type current source 54 comprises transistor 541 and active pulling on/pull down circuit 540, and wherein, the grid of transistor 541 and active pulling on/pull down circuit 540 couples active pulling on/pull down circuit 540 more in order to receive input voltage vin _ p.The main purpose of active pulling on/pull down circuit 540,530 is to accelerate the switching speed of transistor 541 and 531, the delay that is caused with compensating buffer 511.Impedance circuit 55 comprises two resistance 550 and 551, and resistance 550 is coupled to resistance 551 and electric capacity 58.Common-mode voltage regulating circuit 59 comprises amplifier 590, and two inputs of amplifier 590 are respectively coupled to resistance 550 and reference voltage signal VREF, and the output of amplifier 590 is coupled to current source 52.
When input voltage vin _ p is high level, when Vin_n is low level, transistor 541 conductings, the second suitching type current source 54 can produce reference current ID, transistor 56 conductings, transistor 57 cut-offs, reference current ID flow to Vout_n from end points Vout_p, and produces the differential voltage signal at impedance circuit.When input voltage vin _ p is low level, when Vin_n is high level, transistor 531 conductings, the first suitching type current source 53 can produce reference current ID, and transistor 57 conductings, transistor 56 cut-offs, reference current ID flow to Vout_p from end points Vout_n, and produces the differential voltage signal at impedance circuit.
Please refer to Fig. 6, Fig. 6 illustrates US Patent No. 6,927, the circuit diagram of the 608 another kind of differential signal transmission apparatus 60 that provide.This device 60 comprises current source 52, transistor 56,57, impedance circuit 55, suitching type current source control module 51, the first suitching type current source 63, the second suitching type current source 64, electric capacity 58 and common-mode voltage regulating circuit 59.The difference of Fig. 6 and Fig. 5 only is that the first suitching type current source 63, the second suitching type current source 64 of Fig. 6 are to utilize pulling on/pulling down circuit of passive type, and Fig. 5 uses active pulling on/pull down circuit.The operating principle of Fig. 6 and element to couple relation identical with Fig. 5, so repeat no more.The first suitching type current source 63 comprises electric capacity 630 and transistor 631, and wherein, the grid of transistor 631 and electric capacity 630 couple, and electric capacity 630 is more in order to receive input voltage vin _ p.The second suitching type current source 64 comprises electric capacity 640 and transistor 641, and wherein, the grid of transistor 641 and electric capacity 640 couple, and electric capacity 640 is more in order to receive input voltage vin _ n. Electric capacity 630 and 640 consists of respectively above-mentioned passive type and pulls on/pull down circuit.
Comprehensive the above, US Patent No. 6,927,608 differential signal transmission apparatus that provide with US2004/0150434 all are to utilize control circuit to produce grid voltage with the control transistor switch.Yet, though this kind practice is improved the problem of redundant space, but still had more current source, in order to solve this problem, the invention provides a kind of differential signal transmission apparatus, this device is to utilize the suitching type current source, allows the transistor switch also be current source simultaneously.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of low power differential signal transmission apparatus, and this device is to utilize the suitching type current source, allows the transistor switch also be current source simultaneously.Compare with traditional differential signal transmission apparatus, this low power differential signal transmission apparatus can be saved the redundant space of two current sources, therefore, this low power differential signal transmission apparatus can operate under low supply voltage, and then reaches the effect of low power consumption.
The present invention provides again a kind of low power differential signal transmission apparatus, and this device is compared with traditional differential signal transmission apparatus, and this low power differential signal transmission apparatus can operate under low supply voltage, and then reaches the effect of low power consumption.
The present invention proposes a kind of low power differential signal transmission apparatus, comprises switching electrical current device and differential wave generation device.Wherein, the differential wave generation device is coupled to switching electrical current device.Switching electrical current device receives the first input voltage and the second input voltage, and produces a plurality of reference currents according to the first input voltage and the second input voltage.The differential wave generation device has a plurality of the first transistors, a plurality of transistor seconds, the first output voltage terminal and the second output voltage terminal, the conduction and cut-off of these a plurality of the first transistors and transistor seconds is condition controlled in a plurality of reference currents, the first output voltage terminal is in order to export the first output voltage, the second output voltage terminal is in order to exporting the second output voltage, and the first output voltage and the second output voltage are a plurality of transistorized conduction and cut-off Determines thus.
In an embodiment of the present invention, above-mentioned a plurality of reference currents comprise the first reference current, the second reference current, the 3rd reference current and the 4th reference current.Above-mentioned switching electrical current device comprises the first suitching type current module and the second suitching type current module.The first suitching type current module is in order to receiving the first input voltage and the second input voltage, and produces the first reference current and the second reference current according to the first input voltage and the second input voltage.The second suitching type current module is in order to receiving the first input voltage and the second input voltage, and produces the 3rd reference current and the 4th reference current according to the first input voltage and the second input voltage.And above-mentioned differential wave generation device comprises the first transistor section, transistor seconds section and common-mode voltage generation module.The first transistor section is coupled to the first suitching type current module, and the transistor seconds section is coupled to the second suitching type current module.The first transistor section is comprised of a plurality of the first transistor, and the conduction and cut-off of these a plurality of the first transistors is condition controlled in the first reference current and the second reference current.The transistor seconds section is comprised of a plurality of transistor seconds, and the conduction and cut-off of these a plurality of transistor secondses is condition controlled in the 3rd reference current and the 4th reference current.Common-mode voltage generation module and the first output voltage terminal and the second output voltage terminal couple, electric current according to the common-mode voltage generation module of flowing through produces the first output voltage and the second output voltage, wherein, the electric current of common-mode voltage generation module of flowing through is to flow to the second output voltage terminal or flow to the first output voltage terminal from the second output voltage terminal from the first output voltage terminal, and is controlled by the conduction and cut-off state of these a plurality of the first transistors and transistor seconds.
The present invention proposes a kind of low power differential signal transmission apparatus, comprises the first suitching type current module, the second suitching type current module, the first transistor section, transistor seconds section and common-mode voltage generation module.Wherein, the first transistor section is coupled to the first suitching type current module, and the transistor seconds section is coupled to the second suitching type current module, and the common-mode voltage generation module is coupled to the first transistor section and transistor seconds section.The first suitching type current module is in order to receiving the first input voltage and the second input voltage, and produces the first reference current and the second reference current according to the first input voltage and the second input voltage.The second suitching type current module is in order to receiving the first input voltage and the second input voltage, and produces the 3rd reference current and the 4th reference current according to the first input voltage and the second input voltage.The first transistor section is controlled by the first reference current and the second reference current, produces the first differential current or the second differential current according to the first reference current and the second reference current.The transistor seconds section is controlled by the 3rd reference current and the 4th reference current, produces the 3rd differential current or the 4th differential current according to the 3rd reference current and the 4th reference current.The common-mode voltage generation module has the first output voltage terminal and the second output voltage terminal, be coupled to the first transistor section and transistor seconds section, in order to produce the first output voltage and the second output voltage according to the first differential current, the second differential current, the 3rd differential current and the 4th differential current.
In an embodiment of the present invention, the first above-mentioned suitching type current module comprises the first accelerating circuit, the second accelerating circuit, the first switch, second switch, the first current source and common-mode voltage error amplifier.The first switch is coupled to the first accelerating circuit, and second switch is coupled to the second accelerating circuit, and the common-mode voltage error amplifier is coupled to the first current source.The first accelerating circuit is in order to receiving the second input voltage, and accelerates the service speed of the first transistor section.The second accelerating circuit is in order to receiving the first input voltage, and accelerates the service speed of the first transistor section.The first switch is controlled by the second input voltage, and second switch is controlled by the first input voltage, and the first current source is in order to provide the first electric current.The common-mode voltage error amplifier is in order to receiving preset reference voltage and feedback voltage, and controls the first electric current that the first current source provides according to preset reference voltage and feedback voltage.When the first switch conduction, the first suitching type current module can produce the first reference current; When the second switch conducting, the first suitching type current module can produce the second reference current.
The present invention is because utilizing the suitching type current source, allows the transistor switch also be current source simultaneously.Low power differential signal transmission apparatus provided by the present invention is compared with traditional differential signal transmission apparatus, this low power differential signal transmission apparatus can be saved the redundant space of two current sources, therefore, this low power differential signal transmission apparatus can operate under low supply voltage, and then reach the effect of low power consumption, to meet the march toward trend of low power consumption of present electronic product.In addition, the present invention can accelerate by accelerating circuit the switch speed of transistor switch, and therefore low power differential signal transmission apparatus provided by the present invention has the advantage of high service speed.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphicly, further describe.
Description of drawings
Fig. 1 illustrates the circuit diagram of traditional differential signal transmission apparatus 10.
Fig. 2 has illustrated the circuit diagram of a kind of differential signal transmission apparatus 20 that US Patent No. 2004/0150434 provides.
Fig. 3 illustrates the circuit diagram of reference current control circuit 30.
Fig. 4 illustrates US Patent No. 6,927, the circuit diagram of the 608 a kind of differential signal transmission apparatus 40 that provide.
Fig. 5 illustrates US Patent No. 6,927, the circuit diagram of the 608 another kind of differential signal transmission apparatus 50 that provide.
Fig. 6 illustrates US Patent No. 6,927, the circuit diagram of the 608 another kind of differential signal transmission apparatus 60 that provide.
Fig. 7 is the circuit diagram of low power differential signal transmission apparatus 70 provided by the invention.
Fig. 8 illustrates the circuit diagram of the first suitching type current module 80.
Fig. 9 illustrates the circuit diagram of the second suitching type current module 90.
[main element symbol description]
10: differential signal transmission apparatus
11,13: current source
12: the inverter switch circuit
120～124: transistor
14: impedance
20: differential signal transmission apparatus
21: ON-OFF control circuit
22: switching circuit
220～227: switch
23: differential signal output circuit
230～233: transistor
24: differential amplifier
25: resistance
30: the reference current control circuit
300: operational amplifier
301,304,305: transistor
302,303: resistance
306: current source
40: differential signal transmission apparatus
41: current source
42: suitching type current source control module
43: the first suitching type current sources
44: the second suitching type current sources
45: impedance circuit
46,47: transistor
50: differential signal transmission apparatus
51: suitching type current source control module
510: the adjustable electric current mirror circuit
5100: current source
5101: amplifier
5102,5103: transistor
511: buffer
512,513: switch
52: current source
53: the first suitching type current sources
530: active pulling on/pull down circuit
531: transistor
54: the second suitching type current sources
540: active pulling on/pull down circuit
541: transistor
55: impedance circuit
550,551: resistance
56,57: transistor
58: electric capacity
59: the common-mode voltage regulating circuit
590: amplifier
60: differential signal transmission apparatus
63: the first suitching type current sources
630: electric capacity
631: transistor
64: the second suitching type current sources
640: electric capacity
641: transistor
70: low power differential signal transmission apparatus
71: switching electrical current device
72: the differential wave generation device
720: the first transistor section
721: the transistor seconds section
722: the common-mode voltage generation module
7220,7221: resistance
80: the first suitching type current modules
81,82: accelerating circuit
810,820: inverter
811,821: electric capacity
83: current source
84: the common-mode voltage error amplifier
90: the second suitching type current modules
91,92: accelerating circuit
910,920: inverter
911,921: electric capacity
93: current source
S1～S4: switch
T1～T4:PMOS transistor
T5～T8:NMOS transistor
Embodiment
The present invention utilizes the suitching type current source, allows the transistor switch also be current source simultaneously, to reach the advantage of low power consumption.Please refer to Fig. 7, is the circuit diagram of explanation low power differential signal transmission apparatus provided by the invention.In this embodiment, low power differential signal transmission apparatus 70 comprises switching electrical current device 71 and differential wave generation device 72, and differential wave generation device 72 is coupled to switching electrical current device 71.
Switching electrical current device 71 is in order to receiving input voltage VIN P and VINN, and produces a plurality of reference current I1, I2, I3 and I4 according to input voltage VIN P and VINN.Differential wave generation device 72 has a plurality of PMOS transistor Ts 1, T2, T3, T4, a plurality of nmos pass transistor T5, T6, T7, T8 and output voltage terminal OUTN and OUTP.The conduction and cut-off of PMOS transistor T 1, T2, T3, T4 and nmos pass transistor T5, T6, T7, T8 is condition controlled in reference current I1, I2, I3 and I4, output voltage terminal OUTP is in order to export the first output voltage, output voltage terminal OUTN is in order to exporting the second output voltage, and the first output voltage and the second output voltage are that the conduction and cut-off state by transistor T 1～T8 determines.
Switching electrical current device 71 comprises the first suitching type current module 80 and the second suitching type current module 90.The first suitching type current module 80 is in order to receiving input voltage VIN P and VINN, and produces reference current I1 and I2 according to input voltage VIN P and VINN.The second suitching type current module 90 is in order to receiving input voltage VIN P and VINN, and produces reference current I3 and I4 according to input voltage VIN P and VINN.
Differential wave generation device 72 comprises the first transistor section 720, transistor seconds section 721 and common-mode voltage generation module 722.The first transistor section 720 is coupled to the first suitching type current module 80, and transistor seconds section 721 is coupled to the second suitching type current module 90, and common-mode voltage generation module 722 is coupled to first and second transistor section 720 and 721.The first transistor section 720 is comprised of PMOS transistor T 1～T4, and the conduction and cut-off of PMOS transistor T 1～T4 is condition controlled in reference current I1 and I2.Transistor seconds section 721 is comprised of nmos pass transistor T5～T8, and the conduction and cut-off of nmos pass transistor T5～T8 is condition controlled in reference current I3 and I4.
Common-mode voltage generation module 722 has output voltage terminal OUTP and OUTN, and common-mode voltage generation module 722 produces first and second output voltage according to flowing through own electric current own.The first output voltage is the voltage on the output voltage terminal OUTP, second voltage is the voltage on the output voltage terminal OUTN, and the voltage that the voltage on the output voltage terminal OUTP deducts on the output voltage terminal OUTN is exactly the output differential voltage signal of this differential signal transmission apparatus 70.Wherein, the electric current of the common-mode voltage generation module 722 of flowing through is to flow to output voltage terminal OUTP or flow to output voltage terminal OUTN from output voltage terminal OUTP from output voltage terminal OUTN, and determines according to the conduction and cut-off state of transistor T 1～T8.
Common-mode voltage generation module 722 comprises two resistance 7220 and 7221, and resistance 7220 and 7221 couples.Common-mode voltage generation module 722 has feedback voltage end FEEDBACK, and it is middle with resistance 7221 that feedback voltage end FEEDBACK is positioned at resistance 7220, feedback voltage end FEEDBACK output feedback voltage signal Vs.In this embodiment, the first suitching type current module 80 is more in order to accept feedback voltage signal Vs, with the size of control reference current I1 and I2, to adjust by this value of first and second output voltage.Yet, this embodiment limits the present invention, for example: when the accuracy of designer's failed call output differential voltage signal, common-mode voltage generation module 722 can be only with a resistance, and the design of omitting feedback voltage end FEEDBACK and feedback voltage V s, and the first suitching type current module 80 does not more need to receive feedback voltage signal Vs to adjust the value of first and second output voltage.
In addition, above-mentioned feedback voltage V s also is that design receives to the first suitching type current module 80, and adjusts by this value of first and second output voltage.In brief, the design of feedback path only is in order to obtain more accurate output differential voltage signal, and this feedback path only is a feature of present embodiment, is not to limit the present invention.
The first transistor section 720 is actually the combination of two current mirrors, and PMOS transistor T 1 can be regarded a current mirror as with T2, and PMOS transistor T 3 can be regarded another current mirror as with T4.The grid of PMOS transistor T 1 is coupled to grid and the drain electrode of PMOS transistor T 2, and the drain electrode of PMOS transistor T 1 is coupled to the output voltage terminal OUTN of common-mode voltage generation module 722.The grid of PMOS transistor T 3 is coupled to grid and the drain electrode of PMOS transistor T 4, and the drain electrode of PMOS transistor T 3 is coupled to the output voltage terminal OUTP of common-mode voltage generation module 722.
When input voltage VIN P is high level, and VIIN is when being low level, the first suitching type current module 80 can provide reference current I2 to PMOS transistor T 4 (at this moment, reference current I1 is zero), and PMOS transistor T 4 is a current mirror with T3, therefore, reference current I2 can be with a specific ratio by mirror to PMOS transistor T 3.So transistor T 3 and T4 conducting, and transistor T 1 and T2 cut-off.The second suitching type current module 90 can provide reference current I3 to nmos pass transistor T6 (at this moment, reference current I4 is zero), and nmos pass transistor T6 and T5 are current mirrors, therefore, reference current I3 can be with a specific ratio by mirror to nmos pass transistor T5.So transistor T 5 and T6 conducting, and transistor T 7 and T8 cut-off.At this moment, the flow through electric current of common-mode voltage generation module 722 is to flow to output voltage terminal OUTN by output voltage terminal OUTP.
On the contrary, when input voltage VIN P is low level, and VIIN is when being high level, the first suitching type current module 80 can provide reference current I1 to PMOS transistor T 2 (at this moment, reference current I2 is zero), and PMOS transistor T 1 is a current mirror with T2, therefore, reference current I1 can be with a specific ratio by mirror to PMOS transistor T 1.So transistor T 1 and T2 conducting, and transistor T 3 and T4 cut-off.The second suitching type current module 90 can provide reference current I4 to nmos pass transistor T8 (at this moment, reference current I3 is zero), and nmos pass transistor T7 and T8 are current mirrors, therefore, reference current I4 can be with a specific ratio by mirror to nmos pass transistor T7.So transistor T 7 and T8 conducting, and transistor T 5 and T6 cut-off.At this moment, the flow through electric current of common-mode voltage generation module 722 is to flow to output voltage terminal OUTP by output voltage terminal OUTN.
Then, please refer to Fig. 8, Fig. 8 illustrates the circuit diagram of the first suitching type current module 80 embodiment.The first suitching type current module 80 comprises accelerating circuit 81,82, switch S 1, S2, current source 83 and common-mode voltage error amplifier 84.Wherein, switch S 1 is coupled to accelerating circuit 81, and switch S 2 is coupled to accelerating circuit 82, and current source 83 is coupled to switch S 1 and S2, and common-mode voltage error amplifier 84 is coupled to current source 83.
Accelerating circuit 81 comprises inverter 810 and electric capacity 811, and inverter 810 is coupled to electric capacity 811.Inverter 810 receives the inversion signal of input voltage VIN N and output-input voltage VINN.Accelerating circuit 81 can accelerate the switch speed of the conduction and cut-off state of transistor T 1, and in other words, the service speed that is exactly the first transistor section 720 can be raised.Accelerating circuit 82 comprises inverter 820 and electric capacity 821, and inverter 820 is coupled to electric capacity 821.Inverter 820 receives the inversion signal of input voltage VIN P and output-input voltage VINP.Accelerating circuit 82 can accelerate the switch speed of the conduction and cut-off state of transistor T 3, and in other words, the service speed that is exactly the first transistor section 720 can be raised.
Common-mode voltage error amplifier 84 is in order to receiving the feedback voltage V s of preset reference voltage Vcm and feedback voltage end FEEDBACK, and the electric current I REF that provides according to preset reference voltage Vcm and feedback voltage V s control current source 83.Utilize this common-mode voltage error amplifier 84 can make feedback voltage V s reach the value of preset reference voltage Vcm.In other words, can accurately control exactly the value of output common mode voltage signal.
In addition, as noted earlier, if there is not feedback path, then common-mode voltage error amplifier 84 can remove.If do not consider the problem of transistor switch speed, above-mentioned accelerating circuit 80 and 81 can also remove.In brief, the first suitching type current module 80 that Fig. 8 illustrates only is a kind of execution mode, is not to limit the present invention.
Then, please refer to Fig. 9, Fig. 9 illustrates the circuit diagram of the second suitching type current module 90.The second suitching type current module 90 comprises accelerating circuit 91,92, switch S 3, S4 and current source 93.Wherein, switch S 3 is coupled to accelerating circuit 91, and switch S 4 is coupled to accelerating circuit 92, and current source 93 is coupled to switch S 3 and S4.
Accelerating circuit 91 comprises inverter 910 and electric capacity 911, and inverter 910 is coupled to electric capacity 911.Inverter 910 receives the inversion signal of input voltage VIN N and output-input voltage VINN.Accelerating circuit 91 can accelerate the switch speed of the conduction and cut-off state of transistor T 5, and in other words, the service speed that is exactly transistor seconds section 721 can be raised.Accelerating circuit 92 comprises inverter 920 and electric capacity 921, and inverter 920 is coupled to electric capacity 921.Inverter 920 receives the inversion signal of input voltage VIN P and output-input voltage VINP.Accelerating circuit 92 can accelerate the switch speed of the conduction and cut-off state of transistor T 7, and in other words, the service speed that is exactly transistor seconds section 721 can be raised.
In addition, as noted earlier, the second suitching type current module 90 also can comprise a common-mode voltage error amplifier, does not need to comprise the output common mode voltage signal of a common-mode voltage error amplifier to obtain to be wished to get but prerequisite is the first suitching type current module 80 again.If do not consider the problem of transistor switch speed, above-mentioned accelerating circuit 90 and 91 can remove.In brief, the second suitching type current module 90 that Fig. 9 illustrates only is a kind of execution mode, is not to limit the present invention.
In sum, the present invention utilizes the suitching type current source, allows the transistor switch also be current source simultaneously.Low power differential signal transmission apparatus provided by the present invention is compared with traditional differential signal transmission apparatus, this low power differential signal transmission apparatus can be saved the redundant space of two current sources, therefore, this low power differential signal transmission apparatus can operate under low supply voltage, and then reach the effect of low power consumption, to meet the march toward trend of low power consumption of present electronic product.In addition, the present invention more provides the low power differential signal transmission apparatus with feedback path and accelerating circuit, except allowing this low power differential signal transmission apparatus can high speed under lower power supply voltage the operation, can also be by this feedback path, allow the accurately magnitude of voltage of output common mode voltage signal of this low power differential signal transmission apparatus.
Although the present invention discloses as above with embodiment; so it is not to limit the present invention; have in the technical field under any and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the scope that claims define.
Claims (20)
1. a low power differential signal transmission apparatus is characterized in that, this device comprises:
One switching electrical current device in order to receiving one first input voltage and one second input voltage, and produces a plurality of reference currents according to this first input voltage and the second input voltage; And
One differential wave generation device, be coupled to this switching electrical current device, have a plurality of the first transistors, a plurality of transistor seconds, one first output voltage terminal and one second output voltage terminal, the conducting of those the first transistors and those transistor secondses or cut-off state are controlled by those reference currents, this first output voltage terminal is in order to export one first output voltage, this second output voltage terminal is in order to export one second output voltage, and this first output voltage and this second output voltage are to be determined by those transistorized conductings or cut-off state;
Wherein this differential wave generation device comprises: a first transistor section, be coupled to one first suitching type current module, be comprised of those the first transistors, the conducting of those the first transistors or cut-off state are controlled by one first reference current and one second reference current in these a plurality of reference currents; One transistor seconds section is coupled to one second suitching type current module, is comprised of those transistor secondses, and the conducting of those transistor secondses or cut-off state are controlled by one the 3rd reference current and one the 4th reference current in these a plurality of reference currents; An and common-mode voltage generation module, have this first output voltage terminal and this second output voltage terminal, be coupled to this first transistor section and this transistor seconds section, in order to the electric current according to this common-mode voltage generation module of flowing through, determine the size of this first output voltage and this second output voltage values, wherein, the electric current of this common-mode voltage generation module of flowing through is to flow to this second output voltage terminal or flow to this first output voltage terminal from this second output voltage terminal from this first output voltage terminal, and is controlled by conducting or the cut-off state of those the first transistors and those transistor secondses;
Wherein this first suitching type current module comprises: one first accelerating circuit, in order to receiving this second input voltage, and accelerate the conducting of those the first transistors or the switch speed of cut-off state; One second accelerating circuit in order to receiving this first input voltage, and accelerates the conducting of those the first transistors or the switch speed of cut-off state; One first switch is coupled to this first accelerating circuit, is controlled by this second input voltage; One second switch is coupled to this second accelerating circuit, is controlled by this first input voltage; And one first current source, be coupled to this first switch and this second switch, in order to one first electric current to be provided, wherein, when this first switch conduction, this the first suitching type current module produces this first reference current, and when this second switch conducting, this first suitching type current module produces this second reference current.
2. low power differential signal transmission apparatus according to claim 1 is characterized in that, this switching electrical current device comprises:
This first suitching type current module in order to receiving this first input voltage and this second input voltage, and produces this first reference current and this second reference current according to this first input voltage and this second input voltage; And
This second suitching type current module in order to receiving this first input voltage and this second input voltage, and produces the 3rd reference current and the 4th reference current according to this first input voltage and this second input voltage.
3. low power differential signal transmission apparatus according to claim 1 is characterized in that, this common-mode voltage generation module comprises:
One first resistance is coupled to this first output voltage terminal; And
One second resistance is coupled to this first resistance and this second output voltage terminal, and wherein, this common-mode voltage generation module further has a feedback voltage end, and this feedback voltage end is between this first resistance and this second resistance.
4. low power differential signal transmission apparatus according to claim 3, it is characterized in that, this the first suitching type current module further comprises a common-mode voltage error amplifier, be coupled to this first current source, in order to receiving a feedback voltage of a preset reference voltage and this feedback voltage end, and control this first electric current that this first current source provides according to this preset reference voltage and this feedback voltage.
5. low power differential signal transmission apparatus according to claim 1 is characterized in that, this first accelerating circuit comprises:
One inverter in order to receiving this second input voltage, and is exported the inversion signal of this second input voltage; And
One electric capacity is coupled to this inverter.
6. low power differential signal transmission apparatus according to claim 1 is characterized in that, this second accelerating circuit comprises:
One inverter in order to receiving this first input voltage, and is exported the inversion signal of this first input voltage; And
One electric capacity is coupled to this inverter.
7. low power differential signal transmission apparatus according to claim 2 is characterized in that, this second suitching type current module comprises:
One the 3rd accelerating circuit in order to receiving this second input voltage, and accelerates the conducting of those transistor secondses or the switch speed of cut-off state;
One the 4th accelerating circuit in order to receiving this first input voltage, and accelerates the conducting of those transistor secondses or the switch speed of cut-off state;
One the 3rd switch is coupled to the 3rd accelerating circuit, is controlled by this first input voltage;
One the 4th switch is coupled to the 4th accelerating circuit, is controlled by this second input voltage; And
One second current source, be coupled to the 3rd with the 4th switch, in order to one second electric current to be provided, wherein,
When the 3rd switch conduction, this second suitching type current module produces the 3rd reference current; When the 4th switch conduction, this second suitching type current module produces the 4th reference current.
8. low power differential signal transmission apparatus according to claim 7 is characterized in that, the 3rd accelerating circuit comprises:
One inverter in order to receiving this second input voltage, and is exported the inversion signal of this second input voltage; And
One electric capacity is coupled to this inverter.
9. low power differential signal transmission apparatus according to claim 7 is characterized in that, the 4th accelerating circuit comprises:
One inverter in order to receiving this first input voltage, and is exported the inversion signal of this first input voltage; And
One electric capacity is coupled to this inverter.
10. low power differential signal transmission apparatus according to claim 1 is characterized in that, those the first transistors comprise one the one PMOS transistor, one the 2nd PMOS transistor, one the 3rd PMOS transistor AND gate 1 the 4th PMOS transistor; The transistorized grid of the one PMOS is coupled to the transistorized grid of the 2nd PMOS and a drain electrode, and the transistorized drain electrode of a PMOS is coupled to this second output voltage terminal of this common-mode voltage generation module; The transistorized grid of the 3rd PMOS is coupled to the transistorized grid of the 4th PMOS and a drain electrode, and the transistorized drain electrode of the 3rd PMOS is coupled to this first output voltage terminal of this common-mode voltage generation module.
11. low power differential signal transmission apparatus according to claim 1 is characterized in that, those transistor secondses comprise one first nmos pass transistor, one second nmos pass transistor, one the 3rd nmos pass transistor and one the 4th nmos pass transistor; One grid of this first nmos pass transistor is coupled to a grid and a drain electrode of this second nmos pass transistor, and a drain electrode of this first nmos pass transistor is coupled to this second output voltage terminal of this common-mode voltage generation module; One grid of the 3rd nmos pass transistor is coupled to a grid and a drain electrode of the 4th nmos pass transistor, and a drain electrode of the 3rd nmos pass transistor is coupled to this first output voltage terminal of this common-mode voltage generation module.
12. a low power differential signal transmission apparatus is characterized in that, this device comprises:
One first suitching type current module in order to receiving one first input voltage and one second input voltage, and produces one first reference current and one second reference current according to this first input voltage and this second input voltage;
One second suitching type current module in order to receiving this first input voltage and this second input voltage, and produces one the 3rd reference current and one the 4th reference current according to this first input voltage and this second input voltage;
One the first transistor section is coupled to this first suitching type current module, is controlled by this first reference current and this second reference current, and produces one first differential current and one second differential current according to this first reference current and this second reference current;
One transistor seconds section is coupled to this second suitching type current module, is controlled by the 3rd reference current and the 4th reference current, and produces one the 3rd differential current and one the 4th differential current according to the 3rd reference current and the 4th reference current; And
One common-mode voltage generation module, have one first output voltage terminal and one second output voltage terminal, be coupled to this first transistor section and transistor seconds section, produce this first output voltage and this second output voltage according to this first differential current, this second differential current, the 3rd differential current and the 4th differential current;
Wherein this first suitching type current module comprises: one first accelerating circuit, in order to receiving this second input voltage, and accelerate the service speed of this first transistor section; One second accelerating circuit in order to receiving this first input voltage, and accelerates the service speed of this first transistor section; One first switch is coupled to this first accelerating circuit, is controlled by this second input voltage; One second switch is coupled to this second accelerating circuit, is controlled by this first input voltage; One first current source is coupled to this first switch and this second switch, in order to one first electric current to be provided; An and common-mode voltage error amplifier, be coupled to this first current source, in order to receive a preset reference voltage and a feedback voltage, and control this first electric current that this first current source provides according to this preset reference voltage and this feedback voltage, wherein, when this first switch conduction, this first suitching type current module can produce this first reference current, when this second switch conducting, this first suitching type current module can produce this second reference current.
13. low power differential signal transmission apparatus according to claim 12 is characterized in that, this common-mode voltage generation module comprises:
One first resistance is coupled to this first output voltage terminal; And
One second resistance is coupled to this first resistance and this second output voltage terminal, and wherein, this common-mode voltage generation module has more a feedback voltage end, and in order to export this feedback voltage, this feedback voltage end is between this first resistance and this second resistance.
14. low power differential signal transmission apparatus according to claim 12 is characterized in that, this first accelerating circuit comprises:
One inverter in order to receiving this second input voltage, and is exported the inversion signal of this second input voltage; And
One electric capacity is coupled to this inverter.
15. low power differential signal transmission apparatus according to claim 12 is characterized in that, this second accelerating circuit comprises:
One inverter in order to receiving this first input voltage, and is exported the inversion signal of this first input voltage; And
One electric capacity is coupled to this inverter.
16. low power differential signal transmission apparatus according to claim 12 is characterized in that, this second suitching type current module comprises:
One the 3rd accelerating circuit in order to receiving this second input voltage, and accelerates the service speed of this transistor seconds section;
One the 4th accelerating circuit in order to receiving this first input voltage, and accelerates the service speed of this transistor seconds section;
One the 3rd switch is coupled to the 3rd accelerating circuit, is controlled by this first input voltage;
One the 4th switch is coupled to the 4th accelerating circuit, is controlled by this second input voltage; And
One second current source is coupled to the 3rd switch and the 4th switch, in order to one second electric current to be provided, wherein,
When the 3rd switch conduction, this second suitching type current module produces the 3rd reference current, and when the 4th switch conduction, this second suitching type current module produces the 4th reference current.
17. low power differential signal transmission apparatus according to claim 16 is characterized in that, the 3rd accelerating circuit comprises:
One inverter in order to receiving this second input voltage, and is exported the inversion signal of this second input voltage; And
One electric capacity is coupled to this inverter.
18. low power differential signal transmission apparatus according to claim 16 is characterized in that, the 4th accelerating circuit comprises:
One inverter in order to receiving this first input voltage, and is exported the inversion signal of this first input voltage; And
One electric capacity is coupled to this inverter.
19. low power differential signal transmission apparatus according to claim 12 is characterized in that, this first transistor section comprises:
One first current mirror is coupled to this second output voltage terminal, is controlled by this first reference current, in order to produce this first differential current; And
One second current mirror is coupled to this first output voltage terminal, is controlled by this second reference current, in order to produce this second differential current.
20. low power differential signal transmission apparatus according to claim 12 is characterized in that, this transistor seconds section comprises:
One the 3rd current mirror is coupled to this second output voltage terminal, is controlled by the 3rd reference current, in order to produce the 3rd differential current; And
One the 4th current mirror is coupled to this first output voltage terminal, is controlled by the 4th reference current, in order to produce the 4th differential current.
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| CN103685087B (en) * | 2012-09-07 | 2016-12-21 | 联咏科技股份有限公司 | Differential signal transmission circuit |
| US9876501B2 (en) * | 2013-05-21 | 2018-01-23 | Mediatek Inc. | Switching power amplifier and method for controlling the switching power amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6316964B1 (en) * | 1998-12-08 | 2001-11-13 | Nec Corporation | Method for generating differential tri-states and differential tri-state circuit |
| CN1411140A (en) * | 2001-09-25 | 2003-04-16 | 义隆电子股份有限公司 | Computing amplifier capable of operating under low voltage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6316964B1 (en) * | 1998-12-08 | 2001-11-13 | Nec Corporation | Method for generating differential tri-states and differential tri-state circuit |
| CN1411140A (en) * | 2001-09-25 | 2003-04-16 | 义隆电子股份有限公司 | Computing amplifier capable of operating under low voltage |
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