CN106788285A - A kind of power amplifier current feedback bias circuit - Google Patents
A kind of power amplifier current feedback bias circuit Download PDFInfo
- Publication number
- CN106788285A CN106788285A CN201510808625.5A CN201510808625A CN106788285A CN 106788285 A CN106788285 A CN 106788285A CN 201510808625 A CN201510808625 A CN 201510808625A CN 106788285 A CN106788285 A CN 106788285A
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- power
- tube
- current feedback
- bias circuit
- switching tube
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a kind of power amplifier current feedback bias circuit, including power amplification circuit and current feedback bias circuit, the biasing circuit in power amplification circuit is compensated by current feedback bias circuit, so as to improve the linearity of power amplifier；The current feedback bias circuit includes two switching tubes Q3, Q4 and resistance, electric capacity, the amplitude discriminator of diode composition；The emitter stage of the switching tube Q3 is connected by resistance with the base stage of power tube Q2, the emitter stage of switching tube Q4 is connected with the emitter stage of switching tube Q3, the base stage of switching tube Q4 is followed by the colelctor electrode of power tube Q2 by amplitude discriminator, switching tube Q3, the colelctor electrode of switching tube Q4 connect power supply, and the base stage of switching tube Q3 is by Vc controls.The main object of the present invention is a kind of power amplifier current feedback bias circuit of design, improves the linearity of power amplifier.
Description
Technical field
The present invention relates to circuit design field, especially Designing power amplifier field.
Background technology
Modern Communication System is constantly upgraded, from 2G to 3G, 3G to 4G, to system linearity requirement increasingly
It is high.Power amplifier is the Primary Component that signal power sends, linear finger of the biasing circuit to power amplifier
Mark is even more and plays vital effect.
As shown in figure 1, a conventional power amplifier circuit, the termination powers of inductance L1 mono-, another termination
The colelctor electrode of triode Q1, the termination powers of inductance L2 mono-, the colelctor electrode of another termination triode Q2.Electricity
Hold the termination signal input part node Pin of C1 mono-, the base stage of another termination triode Q1, the collection of triode Q1
Electrode connects the base stage of triode Q2, triode Q1, the grounded emitter of triode Q2 by electric capacity C2.
The base stage of triode Qa connects the emitter stage of control end node Va, resistance Ra mono- termination triode Qa, another
The base stage of termination triode Q1, the termination triode Qa emitter stages of resistance Re mono-, other end ground connection.Three poles
The base stage of pipe Q3 connects the emitter stage of control end node Vc, resistance Rb mono- termination triode Q3, another termination
The base stage of triode Q2, the termination triode Q3 emitter stages of resistance R1 mono-, other end ground connection.
Therefore traditional power amplifier, its biasing circuit does not possess feedback effect, it is therefore desirable to which design is a kind of
New circuit structure, realizes the bias compensation of power amplifier, improves the linearity of power amplifier.
The content of the invention
The main object of the present invention is a kind of power amplifier current feedback bias circuit of design, improves power and puts
The linearity of big device.
In order to solve above-mentioned technical problem, the invention provides a kind of power amplifier current feedback biasing electricity
Road, including power amplification circuit and current feedback bias circuit, power is compensated by current feedback bias circuit
Biasing circuit in amplifying circuit, so as to improve the linearity of power amplifier；
The power amplification circuit include input signal, power tube Q1, capacitance C1, power tube Q2,
Capacitance C2, output signal；Capacitance C1 is connected between input signal and power tube Q1 base stages, every
Straight electric capacity C2 is connected between power tube Q1 colelctor electrodes and power tube Q2 base stages, power tube Q1, power tube Q2
Colelctor electrode be connected with power supply by inductance, power tube Q1, the grounded emitter of power tube Q2；
The current feedback bias circuit includes two switching tubes Q3, Q4 and resistance, electric capacity, diode group
Into amplitude discriminator；The emitter stage of the switching tube Q3 is connected by resistance with the base stage of power tube Q2, switch
The emitter stage of pipe Q4 is connected with the emitter stage of switching tube Q3, and the base stage of switching tube Q4 is followed by by amplitude discriminator
The colelctor electrode of power tube Q2, switching tube Q3, the colelctor electrode of switching tube Q4 connect power supply, the base of switching tube Q3
Pole is by Vc controls.
In a preferred embodiment：The base stage of the switching tube Q4 is followed by diode D1's by resistance R2
Negative pole, the positive pole of diode D1 is followed by power tube Q2's by the resistance R1 and electric capacity C3 of a series connection
Colelctor electrode, the base stage of switching tube Q4 is grounded by electric capacity C4, and the negative pole of diode D1 is connect by resistance R3
Ground, the plus earth of diode D2, negative pole is connected on the positive pole of diode D1.
In a preferred embodiment：Described switching tube Q3, Q4 are triode or NMOS tube.
In a preferred embodiment：The power amplification circuit extends further to three-level or multiple power levels amplify
Circuit.
In a preferred embodiment：In three-level or multiple power levels amplifying circuit, the current feedback bias electricity
Road is connected between the base stage of the power tube Qn of afterbody amplifier and colelctor electrode.
Compared to prior art, the present invention possesses following beneficial effect：
The present invention increases by electric capacity C3 by conventional power amplifier circuit base, resistance R1, and two
The amplitude discriminator of pole pipe D1, diode D2, resistance R2, resistance R3, electric capacity C4 composition, to output signal
Amplitude be monitored and by triode Q4 formed current feedback to power tube Q2 base stage, to Q2's
Bias current is compensated.Realize when output power signal increases, the bias current of power tube Q2 is certainly
Dynamic increase；When power output reduces, the automatic adaptive process for reducing of bias current of power tube Q2.
So as to the linearity of boost amplifier.
Brief description of the drawings
Fig. 1 is conventional power amplifier circuit diagram；
Fig. 2 is preferred embodiment of the present invention intermediate power amplifier current feedback bias circuit figure.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
A kind of power amplifier current feedback bias circuit of the present invention by the first order as shown in Fig. 2 put
Big circuit 101, second level amplifying circuit 102 and current feedback bias circuit 103 are constituted.
First order amplifying circuit 101 and second level amplifying circuit 102, including input signal, power tube Q1,
Capacitance C1, power tube Q2, capacitance C2, output signal, C1 are connected on input signal and Q1 bases
Between pole, C2 is connected between power tube Q1 colelctor electrodes and power tube Q2 base stages, power tube Q1, power tube
The grounded emitter of Q2.
In current feedback bias circuit 103, the plus earth of diode D2, negative pole connects diode D1's
Positive pole.R1 and C3 is concatenated respectively between the positive best triode Q2 colelctor electrodes of diode D1.Resistance R3 one end
Ground connection, the negative pole of another terminating diode D1.The negative pole of the terminating diode D1 of resistance R2 mono-, the other end
Connect the base stage of triode Q4.The base stage of the termination triodes of electric capacity C3 mono- Q4, other end ground connection.Triode
The colelctor electrode of Q4 connects power supply.The emitter stage of triode Q4 connects the emitter stage of triode Q3.Triode Q3's
Base stage meets control end node Vc.The colelctor electrode of triode Q3 connects power supply.The termination triodes of resistance Rb mono- Q3
Emitter-base bandgap grading, the base stage of another termination triode Q4.
The present invention increases by electric capacity C3 by conventional power amplifier circuit base, resistance R1, and two
The amplitude discriminator of pole pipe D1, diode D2, resistance R2, resistance R3, electric capacity C4 composition, to output signal
Amplitude be monitored and by triode Q4 formed current feedback to power tube Q2 base stage, to Q2's
Bias current is compensated.Realize when output power signal increases, the bias current of power tube Q2 is certainly
Dynamic increase；When power output reduces, the automatic adaptive process for reducing of bias current of power tube Q2.
So as to the linearity of boost amplifier.
It should be noted that be two-stage structure for amplifying in power amplification circuit above, in fact, of the invention
Current biasing circuit can also apply three-level amplify or the multistage power amplification circuit for amplifying in.Only need
The current feedback bias circuit is connected on the base stage and colelctor electrode of the power tube Qn of afterbody amplifier
Between.Also, the triode Q3 and Q4 can also replace with metal-oxide-semiconductor.
The above, is only present pre-ferred embodiments, not makees any to technical scope of the invention
Limitation, therefore every any trickle amendment made to above example according to technical spirit of the invention, it is equivalent to become
Change and modify, still fall within the range of technical solution of the present invention.
Claims (5)
1. a kind of power amplifier current feedback bias circuit, it is characterised in that：Including power amplification electricity
Road and current feedback bias circuit, by inclined in current feedback bias circuit compensation power amplification circuit
Circuits, so as to improve the linearity of power amplifier；
The power amplification circuit includes input signal, power tube Q1, capacitance C1, power tube
Q2, capacitance C2, output signal；Capacitance C1 is connected on input signal and power tube Q1 bases
Between pole, capacitance C2 is connected between power tube Q1 colelctor electrodes and power tube Q2 base stages, power
Pipe Q1, the colelctor electrode of power tube Q2 are connected by inductance with power supply, power tube Q1, power tube Q2
Grounded emitter；
The current feedback bias circuit includes two switching tubes Q3, Q4 and resistance, electric capacity, two poles
The amplitude discriminator of pipe composition；The emitter stage of the switching tube Q3 passes through the base stage phase of resistance and power tube Q2
Even, the emitter stage of switching tube Q4 is connected with the emitter stage of switching tube Q3, and the base stage of switching tube Q4 is led to
The colelctor electrode that amplitude discriminator is followed by power tube Q2 is crossed, switching tube Q3, the colelctor electrode of switching tube Q4 connect electricity
Source, the base stage of switching tube Q3 is by Vc controls.
2. a kind of power amplifier current feedback bias circuit according to claim 1, its feature
It is：The base stage of the switching tube Q4 is followed by the negative pole of diode D1, diode by resistance R2
The positive pole of D1 is followed by the colelctor electrode in power tube Q2 by the resistance R1 and electric capacity C3 of a series connection,
The base stage of switching tube Q4 is grounded by electric capacity C4, and the negative pole of diode D1 is grounded by resistance R3,
The plus earth of diode D2, negative pole is connected on the positive pole of diode D1.
3. a kind of power amplifier current feedback bias circuit according to claim 1, its feature
It is：Described switching tube Q3, Q4 are triode or NMOS tube.
4. a kind of power amplifier current feedback bias circuit according to claim 1, its feature
It is：The power amplification circuit extends further to three-level or multiple power levels amplifying circuit.
5. a kind of power amplifier current feedback bias circuit according to claim 4, its feature
It is：In three-level or multiple power levels amplifying circuit, the current feedback bias circuit is connected on last
Between the base stage and colelctor electrode of the power tube Qn of level amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510808625.5A CN106788285A (en) | 2015-11-20 | 2015-11-20 | A kind of power amplifier current feedback bias circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510808625.5A CN106788285A (en) | 2015-11-20 | 2015-11-20 | A kind of power amplifier current feedback bias circuit |
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| CN106788285A true CN106788285A (en) | 2017-05-31 |
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| CN201510808625.5A Pending CN106788285A (en) | 2015-11-20 | 2015-11-20 | A kind of power amplifier current feedback bias circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019007294A1 (en) * | 2017-07-05 | 2019-01-10 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier based on power detection feedback, chip, and communication terminal |
| WO2019007295A1 (en) * | 2017-07-05 | 2019-01-10 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier based on current detection feedback, chip, and communication terminal |
| CN114039556A (en) * | 2021-09-30 | 2022-02-11 | 锐磐微电子科技(上海)有限公司 | Radio frequency power amplifier and radio frequency power amplification system |
| CN115882795A (en) * | 2023-02-03 | 2023-03-31 | 成都明夷电子科技有限公司 | Power amplifier with linearization compensation structure |
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| US5710523A (en) * | 1996-01-16 | 1998-01-20 | Trw Inc. | Low noise-low distortion hemt low noise amplifier (LNA) with monolithic tunable HBT active feedback |
| US6111466A (en) * | 1999-03-22 | 2000-08-29 | Motorola, Inc. | Amplifier with feedback to provide bias adjustment |
| CN102624344A (en) * | 2012-03-22 | 2012-08-01 | 无锡士康通讯技术有限公司 | Power amplifier |
| CN103023440A (en) * | 2012-12-20 | 2013-04-03 | 中国科学院微电子研究所 | Circuit for improving linearity of power amplifier |
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2015
- 2015-11-20 CN CN201510808625.5A patent/CN106788285A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5710523A (en) * | 1996-01-16 | 1998-01-20 | Trw Inc. | Low noise-low distortion hemt low noise amplifier (LNA) with monolithic tunable HBT active feedback |
| US6111466A (en) * | 1999-03-22 | 2000-08-29 | Motorola, Inc. | Amplifier with feedback to provide bias adjustment |
| CN102624344A (en) * | 2012-03-22 | 2012-08-01 | 无锡士康通讯技术有限公司 | Power amplifier |
| CN103023440A (en) * | 2012-12-20 | 2013-04-03 | 中国科学院微电子研究所 | Circuit for improving linearity of power amplifier |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019007294A1 (en) * | 2017-07-05 | 2019-01-10 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier based on power detection feedback, chip, and communication terminal |
| WO2019007295A1 (en) * | 2017-07-05 | 2019-01-10 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier based on current detection feedback, chip, and communication terminal |
| EP3651356A1 (en) * | 2017-07-05 | 2020-05-13 | Vanchip (Tianjin) Technology Co., Ltd. | Radio frequency power amplifier based on current detection feedback, chip, and communication terminal |
| EP3651357A4 (en) * | 2017-07-05 | 2021-04-07 | Vanchip (Tianjin) Technology Co., Ltd. | Radio frequency power amplifier based on power detection feedback, chip, and communication terminal |
| EP3651356A4 (en) * | 2017-07-05 | 2021-04-07 | Vanchip (Tianjin) Technology Co., Ltd. | Radio frequency power amplifier based on current detection feedback, chip, and communication terminal |
| US11177781B2 (en) | 2017-07-05 | 2021-11-16 | Vanchip (Tianjin) Technology Co., Ltd. | Radio frequency power amplifier based on current detection feedback, chip and communication terminal |
| US11323074B2 (en) | 2017-07-05 | 2022-05-03 | Vanchip (Tianjin) Technology Co., Ltd. | Radio frequency power amplifier based on power detection feedback, chip and communication terminal |
| CN114039556A (en) * | 2021-09-30 | 2022-02-11 | 锐磐微电子科技(上海)有限公司 | Radio frequency power amplifier and radio frequency power amplification system |
| CN115882795A (en) * | 2023-02-03 | 2023-03-31 | 成都明夷电子科技有限公司 | Power amplifier with linearization compensation structure |
| CN115882795B (en) * | 2023-02-03 | 2023-04-28 | 成都明夷电子科技有限公司 | Power amplifier with linearization compensation structure |
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Application publication date: 20170531 |