CN101651477B - Efficiency intensifying method of radio frequency power amplifiers and efficiency intensifying circuit thereof - Google Patents
Efficiency intensifying method of radio frequency power amplifiers and efficiency intensifying circuit thereof Download PDFInfo
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- CN101651477B CN101651477B CN 200910192106 CN200910192106A CN101651477B CN 101651477 B CN101651477 B CN 101651477B CN 200910192106 CN200910192106 CN 200910192106 CN 200910192106 A CN200910192106 A CN 200910192106A CN 101651477 B CN101651477 B CN 101651477B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
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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
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Abstract
The invention discloses an efficiency intensifying method of radio frequency power amplifiers and an efficiency intensifying circuit thereof. The method is used for detecting current or power by a detecting circuit; then a control signal is produced by a control circuit for regulating a biasing circuit of a radio frequency power amplifier, thereby gradually slowing the increase of the current of the radio frequency power amplifier along with input power; or when the current or the power achieves a certain value, the increase of the current along with the input power is slowed. The invention enhances the efficiency of the radio frequency power amplifier and also effectively improves the linearity of the radio frequency power amplifier; moreover, the invention can be better combined with the prior efficiency intensifying technique for better enhancing the efficiency of the radio frequency power amplifier.
Description
Technical field
The present invention relates to a kind of efficient Enhancement Method of radio-frequency power amplifier, the invention still further relates to a kind of efficient intensifier circuit of radio-frequency power amplifier.
Background technology
Radio-frequency power amplifier is widely used in various wireless telecommunications systems and the electronic system, such as mobile phone, portable terminal etc., it is the critical component of realizing wireless transmission, is used for modulated radiofrequency signal is amplified to certain performance number, is transferred to antenna transmission again and goes out.Radio-frequency power amplifier is as the module of power consumption maximum in the transceiver, and its efficient has just determined the efficient of whole transceiver, and for this handheld device of picture mobile phone, the efficient of radio-frequency power amplifier has just directly determined the service time of battery of mobile phone.The efficient of radio-frequency power amplifier is generally used power added efficiency (Power Anded Efficiency, PAE, efficient of the present invention is power added efficiency) characterize, it is defined as power output Pout and the difference of input power Pin and the ratio of electrical source consumption power P dc, namely
In the 3G communication system, because what adopt is non-constant envelope modulation, signal is inclusion information on amplitude, this just requires radio-frequency power amplifier is a linear power amplifier, thereby usually all allow it be offset to category-A or the AB class magnifying state of high linearity, when peak power output Pout=28dBm, the efficient of this class radio-frequency power amplifier only has 35%, and efficient was lower when power output was low.Therefore in the 3G communication system that needs data high-speed to transmit, improve the efficient of radio-frequency power amplifier for more seeming particularly crucial the service time that prolongs battery.
The method of existing raising efficiency of RF power amplifier mainly realizes by the bias state of change radio-frequency power amplifier with in the impedance of radio-frequency power amplifier output increase resonant network change output harmonic wave.
At first, because it is a linear amplifier that the 3G communication system requires radio-frequency power amplifier, so that radio-frequency power amplifier all is offset to category-A or the AB class magnifying state of high linearity usually, thus very limited to the raising of efficient under the prerequisite that guarantees the linearity by the method that changes the radio-frequency power amplifier bias state.
Secondly, output at radio-frequency power amplifier adds the LC resonant network, by regulating the harmonic impedance of radio-frequency power amplifier, so that when the voltage on the transistor in the power amplifier reaches maximum and the electric current that flows through above it is controlled to minimum value, can reduce the power loss of transistor self like this, thereby reach the purpose that improves efficiency power amplifier.Adopt existing method of raising the efficiency still inadequate for the radio-frequency power amplifier that is applied to the 3G system; because for non-constant envelope signal; linear RF power amplifier can not be pushed to the compressional zone; and must adopt Power back to make radio-frequency power amplifier work in linear zone; rollback is more; linearity is better; but the efficient of radio-frequency power amplifier is also lower; usually the linear efficiency behind the rollback drops to about 30%, and this is so that only adopt prior art to be difficult to satisfy 3G standard to the requirement of efficiency of RF power amplifier.
Summary of the invention
Goal of the invention of the present invention provides a kind of efficient Enhancement Method of radio-frequency power amplifier, and to satisfy 3G standard to the requirement of radio-frequency power amplifier, simultaneously, the present invention also provides a kind of efficient intensifier circuit of radio-frequency power amplifier.
In order to take into account efficient and the linearity, radio-frequency power amplifier is offset to AB class operating state usually, and for the characteristics of AB class operating state, along with the increase of input power, power output and direct current increase synchronously, by effectiveness formula
As can be known, the control dc power helps to improve the efficient of radio-frequency power amplifier.
Based on foregoing description, the present invention proposes a kind of Enhancement Method of efficiency of RF power amplifier, the method utilizes a testing circuit to detect electric current or power, then produce the biasing circuit that a control signal is regulated radio-frequency power amplifier by a control circuit, in order to the increase with input power of the electric current that progressively slows down radio-frequency power amplifier, perhaps, when reaching certain value, electric current or input power slow down again electric current with the increase of input power.
For realizing the second goal of the invention of the present invention, the invention provides a kind of efficient intensifier circuit of radio-frequency power amplifier, this circuit comprises,
A testing circuit, in order to electric current or the power that detects described power amplifier,
A control circuit, this control circuit are connected between described testing circuit and the following biasing circuit, in order to producing control signal according to testing circuit,
A biasing circuit, link to each other with described radio-frequency power amplifier, can be regulated by the control signal of prime, in order to the increase with input power of the electric current that progressively slows down radio-frequency power amplifier, perhaps, when reaching certain value, electric current or input power slow down again electric current with the increase of input power.
In one embodiment of the invention, described testing circuit is in order to detect the electric current of radio-frequency power amplifier.
In one embodiment of the invention, described radio-frequency power amplifier has first order amplifier and second level amplifier, and described testing circuit is in order to detect the electric current of first order amplifier, and described biasing circuit is the biasing circuit of the second amplifier.This circuit can progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, perhaps, slows down it with the increase of input power when electric current reaches certain value again, to reach the purpose that improves efficiency of RF power amplifier.Based on same principle, also can be set to by this efficient intensifier circuit, control the biasing circuit of first order amplifier by the electric current that detects second level amplifier, or control the wherein biasing circuit of one-level by the electric current that detects whole radio-frequency power amplifier.
In one embodiment of the invention, described testing circuit is in order to detect the power output of radio-frequency power amplifier, thereby progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, perhaps, when power output reaches certain value, slow down again electric current with the increase of input power.
In one embodiment of the invention, described radio-frequency power amplifier has first order amplifier and second level amplifier, and described testing circuit is in order to detect the power output of first order amplifier, and described biasing circuit is the biasing circuit of the second amplifier.This circuit can progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, perhaps, slows down electric current with the increase of input power when input power reaches certain value again.
Compare with conventional art, the present invention has following advantage: 1, the present invention by detecting radio-frequency power amplifier electric current or power regulate biasing circuit with the method that improves efficiency of RF power amplifier when improving efficiency of RF power amplifier, also can effectively improve the linearity of radio-frequency power amplifier.2, the efficient of the present invention's proposition strengthens the good use that combine with existing efficient enhancing technology of technology energy, to improve better the efficient of radio-frequency power amplifier.
Description of drawings
Fig. 1 is the circuit diagram of the 1st embodiment, and it regulates biasing circuit by detecting electric current;
Fig. 2 is the circuit diagram of the 2nd embodiment, and it regulates the biasing circuit of second level amplifier by the electric current that detects first order amplifier.
Fig. 3 is the circuit diagram of the 3rd embodiment, and it regulates biasing circuit by detecting power output;
Fig. 4 is the circuit diagram of the 4th embodiment, and it is by the detection input power, or the power output of previous stage amplifier is regulated biasing circuit.
Embodiment
Fig. 1 is the circuit diagram of the present invention the 1st embodiment.Such as figure, radio-frequency power amplifier PA is connected between input signal RFin and the output signal RFout, and link to each other with the input of current detection circuit and the output of biasing circuit, the output of current detection circuit links to each other with the input of control circuit, the output of control circuit then links to each other with the biasing circuit input, and inductance L 1 links to each other with power supply VCC with the output of PA respectively.The implementation of this embodiment is at first to utilize current detection circuit to detect the electric current of radio-frequency power amplifier, then pass to control circuit and produce a control signal, regulate biasing circuit by control signal again, thereby progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, or, when reaching certain value, slows down again in electric current it with the increase of input power, to reach the purpose that improves efficiency of RF power amplifier.
Fig. 2 is the circuit diagram of the present invention the 2nd embodiment.Such as figure, the first order PA1 of radio-frequency power amplifier and second level PA2 are serially connected with between input signal RFin and the output signal RFout, inductance L 1 is connected between the PA1 output and power supply VCC1 of radio-frequency power amplifier, inductance L 2 is connected between the output and power supply VCC2 of PA2, the input of current detection circuit links to each other with PA1, output links to each other with the input of control circuit, and the output of control circuit links to each other with the input of biasing circuit, and the output of biasing circuit links to each other with PA2 again.The implementation of this embodiment is for utilizing first current detection circuit to detect the electric current of first order amplifier, then pass to control circuit and produce a control signal, regulated again the biasing circuit of second level amplifier by control signal, thereby progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, or, when reaching certain value, slows down again in electric current it with the increase of input power, to reach the purpose that improves efficiency of RF power amplifier.The electric current that also can detect second level amplifier based on same principle is controlled the biasing circuit of first order amplifier, or, detect the electric current of whole radio-frequency power amplifier and control the wherein biasing circuit of certain one-level, to reach the purpose that improves whole efficiency of RF power amplifier.
Fig. 3 is the circuit diagram of the present invention the 3rd embodiment.Such as figure, radio-frequency power amplifier PA is connected between input signal RFin and the power-sensing circuit, power-sensing circuit links to each other with input, inductance L 1 and the output signal RFout of control circuit respectively again, the output of control circuit links to each other with the input of biasing circuit, and the output of biasing circuit links to each other with PA again, and the choke induction L1 other end of radio-frequency power amplifier is connected with power supply VCC.The implementation of this embodiment is at first utilizing power-sensing circuit to detect power output, then pass to control circuit and produce a control signal, regulate biasing circuit by control signal again, thereby progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, or, when reaching certain value, power output slows down again electric current with the increase of input power, to reach the purpose that improves efficiency of RF power amplifier.
Fig. 4 is the circuit diagram of the 4th kind of embodiment of the present invention.Such as figure, radio-frequency power amplifier PA is connected between power-sensing circuit and the output signal RFout, power-sensing circuit links to each other with the input of input signal RFin and control circuit respectively again, the output of control circuit links to each other with the input of biasing circuit, the output of biasing circuit links to each other with PA again, and inductance L 1 links to each other with power supply VCC with the output of PA respectively.The implementation of this embodiment is for utilizing first power-sensing circuit to detect the input power of radio-frequency power amplifier, or the power output of previous stage amplifier, then it passes to control circuit and produces a control signal, regulated again the biasing circuit of radio-frequency power amplifier by control signal, thereby progressively slow down the electric current of radio-frequency power amplifier with the increase of input power, or, when reaching certain value, input power slows down again electric current with the increase of input power, to reach the purpose that improves efficiency of RF power amplifier.
The above it should be noted that only for the better embodiment of the present invention, conceives under the prerequisite its any minor variations of doing and is equal to replacement not breaking away from the present invention, all should belong to protection scope of the present invention.
Claims (1)
1. the efficient intensifier circuit of a radio-frequency power amplifier is characterized in that, described efficient intensifier circuit comprises,
A testing circuit is in order to electric current or the power that detects described power amplifier;
A control circuit, this control circuit are connected between described testing circuit and the following biasing circuit, produce control signal in order to the state according to testing circuit;
A biasing circuit, link to each other with described radio-frequency power amplifier, can be regulated by the control signal that described control circuit produces, in order to the increase with input power of the electric current that progressively slows down radio-frequency power amplifier, perhaps, when reaching certain value, electric current or input power slow down again electric current with the increase of input power;
Described radio-frequency power amplifier has first order amplifier and second level amplifier, and described testing circuit is in order to detect the electric current of first order amplifier, and described biasing circuit is the biasing circuit of second level amplifier;
Described radio-frequency power amplifier has first order amplifier and second level amplifier, and described testing circuit is in order to detect the power output of first order amplifier, and described biasing circuit is the biasing circuit of second level amplifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910192106 CN101651477B (en) | 2009-09-04 | 2009-09-04 | Efficiency intensifying method of radio frequency power amplifiers and efficiency intensifying circuit thereof |
| PCT/CN2009/075974 WO2011026292A1 (en) | 2009-09-04 | 2009-12-24 | Method for enhancing efficiency of radio frequency power amplifier and efficiency enhancing circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910192106 CN101651477B (en) | 2009-09-04 | 2009-09-04 | Efficiency intensifying method of radio frequency power amplifiers and efficiency intensifying circuit thereof |
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| Publication Number | Publication Date |
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| CN101651477A CN101651477A (en) | 2010-02-17 |
| CN101651477B true CN101651477B (en) | 2013-01-02 |
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| CN 200910192106 Active CN101651477B (en) | 2009-09-04 | 2009-09-04 | Efficiency intensifying method of radio frequency power amplifiers and efficiency intensifying circuit thereof |
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| WO (1) | WO2011026292A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8463208B2 (en) * | 2010-08-30 | 2013-06-11 | Intel Mobile Communications GmbH | DC power control for power amplifiers |
| CN102386865B (en) * | 2011-09-22 | 2014-07-30 | 四川和芯微电子股份有限公司 | Operational amplification circuit |
| CN103716870B (en) * | 2013-12-31 | 2018-02-06 | 北京朗波芯微技术有限公司 | Output control device for mobile communication terminal |
| CN105871388B (en) * | 2016-04-25 | 2018-08-14 | 埃赋隆半导体（上海）有限公司 | Radio-frequency power amplifier and mobile communication terminal |
| CN108123693B (en) * | 2017-12-20 | 2021-06-15 | 湖南智领通信科技有限公司 | Automatic control method for improving efficiency of radio frequency power amplifier |
| CN108259007B (en) * | 2017-12-29 | 2021-06-04 | 思瑞浦微电子科技（苏州）股份有限公司 | Enhancement circuit applied to operational amplifier conversion rate |
| CN109150115B (en) * | 2018-08-01 | 2022-07-12 | 北京昂瑞微电子技术股份有限公司 | Radio frequency power amplifier bias circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081794A (en) * | 1992-07-02 | 1994-02-09 | 莫托罗拉公司 | The method and apparatus of radio frequency amplifier biasing control |
| CN1788412A (en) * | 2002-12-16 | 2006-06-14 | 皇家飞利浦电子股份有限公司 | Self adaptable bias circuit for enabling dynamic control of quiescent current in a linear power amplifier |
| CN101124723A (en) * | 2004-11-29 | 2008-02-13 | 皇家飞利浦电子股份有限公司 | Current limiting circuit for RF power amplifier |
-
2009
- 2009-09-04 CN CN 200910192106 patent/CN101651477B/en active Active
- 2009-12-24 WO PCT/CN2009/075974 patent/WO2011026292A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081794A (en) * | 1992-07-02 | 1994-02-09 | 莫托罗拉公司 | The method and apparatus of radio frequency amplifier biasing control |
| CN1788412A (en) * | 2002-12-16 | 2006-06-14 | 皇家飞利浦电子股份有限公司 | Self adaptable bias circuit for enabling dynamic control of quiescent current in a linear power amplifier |
| CN101124723A (en) * | 2004-11-29 | 2008-02-13 | 皇家飞利浦电子股份有限公司 | Current limiting circuit for RF power amplifier |
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| Publication number | Publication date |
|---|---|
| CN101651477A (en) | 2010-02-17 |
| WO2011026292A1 (en) | 2011-03-10 |
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