CN105305987A - Power amplifier and class AB power amplifier - Google Patents
Power amplifier and class AB power amplifier Download PDFInfo
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- CN105305987A CN105305987A CN201410310902.5A CN201410310902A CN105305987A CN 105305987 A CN105305987 A CN 105305987A CN 201410310902 A CN201410310902 A CN 201410310902A CN 105305987 A CN105305987 A CN 105305987A
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- type electric
- electric crystal
- end points
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- control signal
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Abstract
The invention discloses a power amplifier, which comprises a gain stage circuit, an output stage circuit and a first capacitor, wherein the gain stage circuit is used for receiving at least one first input signal to generate a first pair of control signals; the output stage circuit is provided with a first endpoint and a second end point to receive the first pair of control signals and generate a first output signal according to the first pair of control signals; and the first capacitor is coupled between the first endpoint and the second endpoint.
Description
Technical field
Relating power amplifier of the present invention, espespecially a kind of power amplifier that can reduce common-mode noise.
Background technology
Line drive (linedriver) in Ethernet wafer can take common-mode noise (commonmodenoise) out of when output signal, the grid line that this common-mode noise can be brought to rear end produces electromagnetic interference (ElectroMagneticInterference, EMI), the method of general elimination common-mode noise normally adds common mode filtering inductor (CommonModeChoke) or Bao uncle Smith's terminal resistance (BobSmithterminationresistors) on signal transmission path, but the method can increase manufacturing cost.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of power amplifier, and it can eliminate common-mode noise effectively, to solve the problem of prior art.
According to one embodiment of the invention, a kind of power amplifier includes a gain stage circuit, an output-stage circuit and one first electric capacity, wherein this gain stage circuit is in order to receive one first input signal to produce one first pair of control signal, this output-stage circuit has one first end points and one second end points to receive this first pair of control signal, and produce one first output signal according to this first pair of control signal, and this first electric capacity is coupled between this first end points and this second end points.
According to another embodiment of the present invention, a kind of AB power-like amplifier includes a gain stage circuit, an output-stage circuit, one first electric capacity and one second electric capacity, wherein this gain stage circuit is in order to receive one first input signal and one second input signal to produce one first pair of control signal and one second pair of control signal, and wherein this first input signal and this second input signal are a differential input; This output-stage circuit has one first end points and one second end points to receive this first pair of control signal, and produce one first output signal according to this first pair of control signal, this output-stage circuit separately has one the 3rd end points and one the 4th end points to receive this second pair of control signal, and produce one second output signal according to this second pair of control signal, wherein second to output signal be a differential output to this first output signal with this; This first electric capacity is coupled between this first end points and this second end points; And this second electric capacity is coupled between the 3rd end points and the 4th end points.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the power amplifier according to one embodiment of the invention.
Fig. 2 is the schematic diagram of the detailed circuit framework of the power amplifier of foundation one embodiment of the invention.
Embodiment
Some vocabulary is employed to censure specific assembly in the middle of specification and follow-up claim.Person with usual knowledge in their respective areas should understand, and hardware manufacturer may call same element with different nouns.This specification and follow-up claim are not used as the mode of distinguish one element from another with the difference of title, but are used as the criterion of differentiation with element difference functionally." comprising " mentioned in the middle of specification and follow-up claim is in the whole text an open term, therefore should be construed to " comprise but be not limited to ".In addition, " couple " word comprise directly any at this and be indirectly electrically connected means, therefore, if describe a first device in literary composition to be coupled to one second device, then represent this first device and directly can be electrically connected on this second device, or be indirectly electrically connected to this second device by other devices or connection means.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the power amplifier 100 according to one embodiment of the invention.As shown in Figure 1, power amplifier 100 contains a gain stage circuit (gainstage) 110, output-stage circuit (outputstage) 120 and an electric capacity C.In the present embodiment, power amplifier 100 is an AB power-like amplifier, and is arranged in an Ethernet wafer, but the present invention is not as limit.
In the operation of power amplifier 100, gain stage circuit 110 receives an input signal Vin to produce pair of control signal Ctrl_P, Ctrl_N to output-stage circuit 120, and output-stage circuit 120 produces an output signal Vout according to this to control signal Ctrl_P, Ctrl_N again.Electric capacity C be arranged on output-stage circuit 120 be used for receive this between one first end points of control signal Ctrl_P, Ctrl_N and one second end points, and be used to provide a large capacitance, in the present embodiment, the capacitance of electric capacity C is between 500fF (femto-Farad) to 3pF (pico-Farad).
Because AB power-like amplifier 100 is when operation, the control signal Ctrl_P that gain stage circuit 110 produces, Ctrl_N can rock significantly, and now electric capacity C can allow the operation of part of control signal Ctrl_P, Ctrl_N medium-high frequency close to the operation of category-A power amplifier.The reason that class-a amplifier traditionally can suppress more common-mode noise is because power consumption is larger, but AB power-like amplifier 100 of the present invention not needing the effect that just can reach compacting common-mode noise when increasing power consumption, therefore can save more electric power compared to traditional class-a amplifier.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the detailed circuit framework of the power amplifier 200 of foundation one embodiment of the invention.Be similar to the power amplifier 100 shown in Fig. 1, power amplifier 200 shown in Fig. 2 contains gain stage circuit, output-stage circuit and two electric capacity C1, C2, wherein gain stage circuit contains N-type electric crystal MN1 ~ MN4, MN7 ~ MN12, with P type electric crystal MP1 ~ MP4, MP7 ~ MP12, it is used for reception one first input signal Vin and one second input signal Vip, to produce first couple of control signal Ctrl_P1, Ctrl_N1 and second couple control signal Ctrl_P2, Ctrl_N2, wherein the first input signal Vin and the second input signal Vip is a differential input, output-stage circuit then contains and is arranged at supply voltage V
dDand the N-type electric crystal MN5 ~ MN6 between earthed voltage GND and P type electric crystal MP5 ~ MP6, wherein the drain electrode of P type electric crystal MP5 is connected to the drain electrode of N-type electric crystal MN5, and the grid of P type electric crystal MP5 and N-type electric crystal MN5 respectively as one first end points and one second end points to be used for reception first couple of control signal Ctrl_P1, Ctrl_N1, to produce one first output signal Von, similarly, the drain electrode of P type electric crystal MP6 is connected to the drain electrode of N-type electric crystal MN6, and the grid of P type electric crystal MP6 and N-type electric crystal MN6 respectively as one the 3rd end points and one the 4th end points to be used for reception second couple of control signal Ctrl_P2, Ctrl_N2, to produce one second output signal Vop, wherein the first output signal Von and second outputs signal Vop is a differential output.
Electric capacity C1 is arranged between the grid of P type electric crystal MP5 and N-type electric crystal MN5, be used for providing between P type electric crystal MP5 and the grid of N-type electric crystal MN5 the capacitance that large, and electric capacity C2 is arranged between the grid of P type electric crystal MP6 and N-type electric crystal MN6, be used for providing between P type electric crystal MP6 and the grid of N-type electric crystal MN6 the capacitance that large.In the present embodiment, the capacitance of electric capacity C1 and electric capacity C2 is all greater than 500fF, and haply can between 500fF ~ 3pF.
In the present embodiment, power amplifier 200 is operationally AB power-like amplifier, that is in gain stage circuit, can by the grid bias of control N-type electric crystal MN3, MN4 and P type electric crystal MP3, MP4 to make power amplifier 200 operationally for AB power-like amplifier.On the other hand, the gain stage circuit of power amplifier 200 has various ways perhaps on the implementation, and is not limited to the circuit framework shown in Fig. 2.
When power amplifier 200 is operationally AB power-like amplifier time, first couple of control signal Ctrl_P1, Ctrl_N1 that gain stage circuit produces and second couple of control signal Ctrl_P2, Ctrl_N2 can rock significantly, now electric capacity C1, C2 can allow first couple of control signal Ctrl_P1, Ctrl_N1 and the second couple of control signal Ctrl_P2, Ctrl_N2 medium-high frequency the operation of part close to the operation of category-A power amplifier, to reach the effect of compacting common-mode noise, but more electric power can be saved compared to traditional class-a amplifier.In an analog result, suppose that the capacitance of electric capacity C1, C2 is 1pF, then the common-mode noise of power amplifier 200 can reduce by 10 ~ 20dB.
In addition, the power amplifier 200 shown in Fig. 2 is a differential architecture, but this is only an example explanation, and this area has knows that the knowledgeable should be able to recognize that the present invention also can be applicable to (be similar to the explanation of Fig. 1) in the circuit framework of single ended input usually.
Brief summary the present invention, in power amplifier of the present invention, between the N-type electric crystal and two grids of P type electric crystal of output-stage circuit, arrange one there is electric capacity compared with bulky capacitor value, to make power amplifier can suppress common-mode noise when not increasing power consumption, and solve the problem of prior art.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
[symbol description]
| 100 | Power amplifier |
| 110 | Gain stage circuit |
| 120 | Output-stage circuit |
| C、C1、C2 | Electric capacity |
| MN1～MN12 | N-type electric crystal |
| MP1～MP12 | P type electric crystal |
Claims (10)
1. a power amplifier, includes:
One gain stage circuit, in order to receive at least one first input signal to produce one first pair of control signal;
One output-stage circuit, has one first end points and one second end points to receive described first pair of control signal, and produces one first output signal according to described first pair of control signal; And
One first electric capacity, is coupled between described first end points and described second end points.
2. power amplifier according to claim 1, wherein said output-stage circuit includes:
One P type electric crystal; And
One N-type electric crystal, the drain electrode of wherein said N-type electric crystal is connected to the drain electrode of described P type electric crystal;
The grid of wherein said P type electric crystal and described N-type electric crystal respectively as described first end points and described second end points to receive described first pair of control signal, the drain electrode of described N-type electric crystal is used for exporting described first output signal, and described first electric capacity is arranged between the grid of described P type electric crystal and described N-type electric crystal.
3. power amplifier according to claim 1, the capacitance of wherein said first electric capacity is greater than 500fF.
4. power amplifier according to claim 1, wherein said gain stage circuit described first input signal of reception and one second input signal are to produce described first pair of control signal and one second pair of control signal, and described output-stage circuit separately has one the 3rd end points and one the 4th end points outputs signal to produce one second to receive described second pair of control signal, described first input signal and described second input signal are a differential input, and described first output signal is with described second to output signal be a differential output, and described power amplifier separately includes:
One second electric capacity, is coupled between described 3rd end points and described 4th end points.
5. power amplifier according to claim 4, wherein said output-stage circuit includes:
One the one P type electric crystal;
One first N-type electric crystal, the drain electrode of wherein said first N-type electric crystal is connected to the drain electrode of a described P type electric crystal, the grid of a described P type electric crystal and described first N-type electric crystal is respectively as described first end points and described second end points to receive described first pair of control signal, and the drain electrode of described first N-type electric crystal is used for exporting described first output signal;
One the 2nd P type electric crystal; And
One second N-type electric crystal, the drain electrode of wherein said second N-type electric crystal is connected to the drain electrode of described 2nd P type electric crystal, the grid of described 2nd P type electric crystal and described second N-type electric crystal is respectively as described 3rd end points and described 4th end points to receive described second pair of control signal, and the drain electrode of described second N-type electric crystal is used for exporting described second output signal.
6. power amplifier according to claim 1, the capacitance of wherein said first electric capacity and described second electric capacity is all greater than 500fF.
7. power amplifier according to claim 1 is a class ab ammplifier.
8. an AB power-like amplifier, includes:
One gain stage circuit, in order to receive one first input signal and one second input signal to produce one first pair of control signal and one second pair of control signal, wherein said first input signal and described second input signal are a differential input;
One output-stage circuit, has one first end points and one second end points to receive described first pair of control signal, and produces one first output signal according to described first pair of control signal; Described output-stage circuit separately has one the 3rd end points and one the 4th end points to receive described second pair of control signal, and producing one second output signal according to described second pair of control signal, it is a differential output that wherein said first output signal and described second outputs signal;
One first electric capacity, is coupled between described first end points and described second end points; And
One second electric capacity, is coupled between described 3rd end points and described 4th end points.
9. power amplifier according to claim 8, wherein said output-stage circuit includes:
One the one P type electric crystal;
One first N-type electric crystal, the drain electrode of wherein said first N-type electric crystal is connected to the drain electrode of a described P type electric crystal, the grid of a described P type electric crystal and described first N-type electric crystal is respectively as described first end points and described second end points to receive described first pair of control signal, and the drain electrode of described first N-type electric crystal is used for exporting described first output signal;
One the 2nd P type electric crystal; And
One second N-type electric crystal, the drain electrode of wherein said second N-type electric crystal is connected to the drain electrode of described 2nd P type electric crystal, the grid of described 2nd P type electric crystal and described second N-type electric crystal is respectively as described 3rd end points and described 4th end points to receive described second pair of control signal, and the drain electrode of described second N-type electric crystal is used for exporting described second output signal.
10. power amplifier according to claim 8, the capacitance of wherein said first electric capacity and described second electric capacity is all greater than 500fF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310902.5A CN105305987A (en) | 2014-06-30 | 2014-06-30 | Power amplifier and class AB power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310902.5A CN105305987A (en) | 2014-06-30 | 2014-06-30 | Power amplifier and class AB power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105305987A true CN105305987A (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410310902.5A Pending CN105305987A (en) | 2014-06-30 | 2014-06-30 | Power amplifier and class AB power amplifier |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028479A (en) * | 1998-01-07 | 2000-02-22 | Plato Labs, Inc. | Low voltage transmission line driver |
| CN1767379A (en) * | 2004-09-24 | 2006-05-03 | 三星电子株式会社 | Be used to improve the circuit and the method for slew rate of differential amplifiers |
| US7425867B2 (en) * | 2005-09-30 | 2008-09-16 | Agere Systems Inc. | Differential input/differential output converter circuit |
-
2014
- 2014-06-30 CN CN201410310902.5A patent/CN105305987A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028479A (en) * | 1998-01-07 | 2000-02-22 | Plato Labs, Inc. | Low voltage transmission line driver |
| CN1767379A (en) * | 2004-09-24 | 2006-05-03 | 三星电子株式会社 | Be used to improve the circuit and the method for slew rate of differential amplifiers |
| US7425867B2 (en) * | 2005-09-30 | 2008-09-16 | Agere Systems Inc. | Differential input/differential output converter circuit |
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Application publication date: 20160203 |
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