CN101478288A - Method for enhancing efficiency of radio frequency power amplifier and radio frequency power amplifier circuit - Google Patents
Method for enhancing efficiency of radio frequency power amplifier and radio frequency power amplifier circuit Download PDFInfo
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- CN101478288A CN101478288A CNA2008100439827A CN200810043982A CN101478288A CN 101478288 A CN101478288 A CN 101478288A CN A2008100439827 A CNA2008100439827 A CN A2008100439827A CN 200810043982 A CN200810043982 A CN 200810043982A CN 101478288 A CN101478288 A CN 101478288A
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Abstract
The invention relates to a method for increasing the efficiency of a RF power amplifier and a RF power amplifier circuit. An even harmonic low-resistivity network is added in an output network of the RF power amplifier to lead the RF power amplifier to be in an class F functional mode, the efficiency of the RF power amplifier is obviously increased by more than 70 percent, even harmonic and odd harmonic are restrained effectively, and the harmonic distortion of the RF power amplifier is reduced.
Description
Technical field
The present invention relates to a kind of method that improves efficiency of RF power amplifier.The invention still further relates to a kind of radio-frequency (RF) power amplifier circuit.
Background technology
In modern wireless communication systems, radio-frequency power amplifier is a critical component of realizing the radiofrequency signal wireless transmission.Power added efficiency (efficient of the present invention is power added efficiency for Power-Added Efficiency, PAE) is one of important indicator of weighing power amplifier properties, and it is defined as power output P
OutWith input power P
InDifference and the power P supplied with of power supply
DcRatio, promptly
。It had both been shown radio-frequency power amplifier and had converted direct current power the ability of radio-frequency power to, can reflect that again radio-frequency power amplifier amplifies the ability of radio-frequency power.
Existing radio-frequency (RF) power amplifier circuit as shown in Figure 1, comprise radio-frequency power amplifier and the impedance matching network that is connected to described radio-frequency power amplifier output, described output impedance matching networks comprises two inductance L 2 and the L3 that are connected in series between described radio-frequency power amplifier output and the described radio-frequency (RF) power amplifier circuit output, be connected with an electric capacity between the two ends of a wherein back inductance and the ground respectively, as C1 among Fig. 1 and C2; Also be connected with an inductance L 1 between the output of described radio-frequency power amplifier and the power end, the input RFin1 of described radio-frequency (RF) power amplifier circuit is connected to the input of described power amplifier, and an end of described inductance L 3 is the output RFout of described radio-frequency (RF) power amplifier circuit.
When radio-frequency power amplifier is in the category-A operating state, be linear amplifier, for avoid allowing transistor near saturated with end, reduce output signal power usually, thereby make efficient be reduced to 30%～40%.When radio-frequency power amplifier was in the category-B operating state, efficient can arrive more than 70%, but because transistor is in zero bias condition, therefore when input signal was lower than a certain value, one section dead zone promptly appearred in not conducting of transistor in the signal period, make distorted signals.For improving the power output of radio-frequency power amplifier, higher efficient is arranged again, existing technology is to make radio-frequency power amplifier be in AB class operating state, and promptly the angle of flow is slightly larger than 180 °, and its efficient can reach 40%～50% usually.
Yet, when radio-frequency power amplifier is worked, consider the factor of thermal losses and battery working time two aspects in communication system, the efficient that how to improve radio-frequency power amplifier is exactly a major issue.
Summary of the invention
Technical problem to be solved by this invention provides a kind of radio-frequency (RF) power amplifier circuit that improves the method for efficiency of RF power amplifier and realize this method, can improve the efficient of radio-frequency power amplifier, and suppress even-order harmonic and odd harmonic effectively, reduce the harmonic distortion of radio-frequency power amplifier.
For solving the problems of the technologies described above, the technical scheme that the present invention improves the method for efficiency of RF power amplifier is, in the output network of radio-frequency power amplifier, add the even-order harmonic lowohmic network, make radio-frequency power amplifier be in F class operating state, thereby reduce the even-order harmonic impedance of radio-frequency power amplifier output matching network, improve the odd harmonic impedance simultaneously, make the radio-frequency power amplifier output end voltage be shaped as square wave, and the output end current rectification is a half-wave, and described output end voltage waveform is opposite with described output end current waveform phase.
The technical scheme of radio-frequency (RF) power amplifier circuit of the present invention is, comprise radio-frequency power amplifier and the output impedance matching networks that is connected this radio-frequency power amplifier output, the output of described radio-frequency power amplifier also is connected with the even-order harmonic lowohmic network, make radio-frequency power amplifier be in F class operating state, thereby reduce the even-order harmonic impedance of radio-frequency power amplifier output matching network, improve the odd harmonic impedance simultaneously, make the radio-frequency power amplifier output end voltage be shaped as square wave, and the output end current rectification is a half-wave, and described output end voltage waveform is opposite with described output end current waveform phase.
The present invention adds the even-order harmonic lowohmic network in the output network of radio-frequency power amplifier, make radio-frequency power amplifier be in F class operating state, obviously improve more than the efficient to 70% of radio-frequency power amplifier, and suppress even-order harmonic and odd harmonic effectively, reduced the harmonic distortion of radio-frequency power amplifier.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 is the circuit diagram of existing radio-frequency (RF) power amplifier circuit;
Fig. 2 is the circuit diagram of radio-frequency (RF) power amplifier circuit of the present invention;
Fig. 3 is the oscillogram of radio-frequency (RF) power amplifier circuit output signal of the present invention.
Embodiment
The invention discloses a kind of method that improves efficiency of RF power amplifier, in the output network of radio-frequency power amplifier, add the even-order harmonic lowohmic network, make radio-frequency power amplifier be in F class operating state, thereby reduce the even-order harmonic impedance of radio-frequency power amplifier output matching network, improve the odd harmonic impedance simultaneously, make the radio-frequency power amplifier output end voltage be shaped as square wave, and the output end current rectification is a half-wave, and described output end voltage waveform is opposite with described output end current waveform phase.The even-order harmonic lowohmic network of described adding can be for a plurality of.
The invention also discloses a kind of radio-frequency (RF) power amplifier circuit that adopts said method to realize, comprise radio-frequency power amplifier and the output impedance matching networks that is connected this radio-frequency power amplifier output, the output of described radio-frequency power amplifier also is connected with the even-order harmonic lowohmic network, make radio-frequency power amplifier be in F class operating state, thereby reduce the even-order harmonic impedance of radio-frequency power amplifier output matching network, improve the odd harmonic impedance simultaneously, make the radio-frequency power amplifier output end voltage be shaped as square wave, and the output end current rectification is a half-wave, and described output end voltage waveform is opposite with described output end current waveform phase.
Described even-order harmonic lowohmic network is be connected in parallel a plurality of.
Described each even-order harmonic lowohmic network is the LC series resonance network that is connected between described radio-frequency power amplifier output and the ground, described LC series resonance network comprises an electric capacity that is connected in series, C3 as shown in Figure 2 or C4, with an inductance, L5 as shown in Figure 2 or L6, described capacitor C 3 or C4 are connected with described radio-frequency power amplifier output, and described inductance L 5 or L6 are connected with ground.
Among the present invention, described output impedance matching networks is identical with prior art shown in Figure 1, also is connected with an inductance L 4 between the output of described radio-frequency power amplifier and the power end.
As shown in Figure 2, the output adding even-order harmonic lowohmic network at radio-frequency power amplifier makes that the even-order harmonic impedance of radio-frequency power amplifier output matching network is very low, and the odd harmonic impedance is very high simultaneously.Like this, the radio-frequency power amplifier output end voltage is shaped as square wave, and the output end current rectification is a half-wave, as shown in Figure 3.Therefore, still be that the odd harmonic frequency does not all have harmonic power and produces no matter, thereby greatly improved the efficient of radio-frequency power amplifier, and suppress even-order harmonic and odd harmonic effectively, reduced the harmonic distortion of radio-frequency power amplifier in even-order harmonic.
Be without loss of generality, we are designed to example with the circuit way of realization of Fig. 2 with GSM radio-frequency power amplifier output matching network, set forth the embodiment of this patent.Output at radio-frequency power amplifier adds the even-order harmonic lowohmic network, and promptly capacitor C 3 and C4 are parallel to ground.Wherein capacitor C 3 series inductance L5 form a LC series resonance network to ground, and resonance frequency is at second harmonic, make the output network of radio-frequency power amplifier at the output impedance X of second harmonic
2Very low; Capacitor C 4 series inductance L6 form the 2nd LC series resonance network equally to ground, and resonance frequency is at four-time harmonic, make the output network of radio-frequency power amplifier at the output impedance X of four-time harmonic
4Very low.The output that the even-order harmonic lowohmic network that is made of two LC series resonance networks is connected in parallel to radio-frequency power amplifier forms odd harmonic high resistant network, makes the output network of radio-frequency power amplifier at the output impedance X of triple-frequency harmonics
3Very high.Like this, the radio-frequency power amplifier output end voltage is shaped as square wave, and the output end current rectification is a half-wave.Because harmonic power P
n=I
nU
n, wherein n is a harmonic order, works as U
n0 o'clock, I
n≈ 0; Work as I
n0 o'clock, U
n≈ 0, so P
n≈ 0.Adopt the efficient of the radio-frequency power amplifier of this output network can reach more than 70%, harmonic wave suppresses to reach more than the 70dBc.
In said process, the even-order harmonic lowohmic network of actual radio frequency power amplifier is determined by physical circuit.
In sum, the present invention adds the even-order harmonic lowohmic network in the output network of radio-frequency power amplifier, make radio-frequency power amplifier be in F class operating state, obviously improve more than the efficient to 70% of radio-frequency power amplifier, and suppress even-order harmonic and odd harmonic effectively, reduced the harmonic distortion of radio-frequency power amplifier.
Claims (6)
1. method that improves efficiency of RF power amplifier, it is characterized in that, in the output network of radio-frequency power amplifier, add the even-order harmonic lowohmic network, make radio-frequency power amplifier be in F class operating state, thereby reduce the even-order harmonic impedance of radio-frequency power amplifier output matching network, improve the odd harmonic impedance simultaneously, make the radio-frequency power amplifier output end voltage be shaped as square wave, and the output end current rectification is a half-wave, and described output end voltage waveform is opposite with described output end current waveform phase.
2. the method for raising efficiency of RF power amplifier according to claim 1 is characterized in that, the even-order harmonic lowohmic network of described adding is a plurality of.
3. radio-frequency (RF) power amplifier circuit that adopts claim 1 or 2 described methods, comprise radio-frequency power amplifier and the output impedance matching networks that is connected this radio-frequency power amplifier output, it is characterized in that, the output of described radio-frequency power amplifier also is connected with the even-order harmonic lowohmic network, make radio-frequency power amplifier be in F class operating state, thereby reduce the even-order harmonic impedance of radio-frequency power amplifier output matching network, improve the odd harmonic impedance simultaneously, make the radio-frequency power amplifier output end voltage be shaped as square wave, and the output end current rectification is a half-wave, and described output end voltage waveform is opposite with described output end current waveform phase.
4. radio-frequency (RF) power amplifier circuit according to claim 3 is characterized in that, described even-order harmonic lowohmic network is be connected in parallel a plurality of.
5. according to claim 3 or 4 described radio-frequency (RF) power amplifier circuit, it is characterized in that, described each even-order harmonic lowohmic network is the LC series resonance network that is connected between described radio-frequency power amplifier output and the ground, described LC series resonance network comprises an electric capacity and inductance that is connected in series, described electric capacity is connected with described radio-frequency power amplifier output, and described inductance is connected with ground.
6. radio-frequency (RF) power amplifier circuit according to claim 3, it is characterized in that, described output impedance matching networks comprises two inductance that are connected in series between described radio-frequency power amplifier output and the described radio-frequency (RF) power amplifier circuit output, is connected with an electric capacity between the two ends of a wherein back inductance and the ground respectively; Also be connected with an inductance between the output of described radio-frequency power amplifier and the power end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100439827A CN101478288A (en) | 2008-11-24 | 2008-11-24 | Method for enhancing efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
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|---|---|---|---|
| CNA2008100439827A CN101478288A (en) | 2008-11-24 | 2008-11-24 | Method for enhancing efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
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| CN101478288A true CN101478288A (en) | 2009-07-08 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098009A (en) * | 2010-12-20 | 2011-06-15 | 芯通科技（成都）有限公司 | Output match circuit of radio frequency (RF) power amplifier and design method thereof |
| CN101667810B (en) * | 2009-09-29 | 2011-11-16 | 锐迪科科技有限公司 | Chip of double-frequency radio-frequency power amplifier circuit |
| CN102255606A (en) * | 2011-07-25 | 2011-11-23 | 中国科学院微电子研究所 | Solid-state RF (radio frequency) power supply based on E-power amplifying circuit |
| CN102969986A (en) * | 2012-11-19 | 2013-03-13 | 苏州远创达科技有限公司 | Output circuit structure of radio frequency power amplifier |
| CN104579189A (en) * | 2015-02-04 | 2015-04-29 | 广东工业大学 | Circuit structure for improving harmonic performance of radio frequency power amplifier |
| CN104716906A (en) * | 2015-04-03 | 2015-06-17 | 广东工业大学 | Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier |
| CN106416061A (en) * | 2014-04-29 | 2017-02-15 | 天工方案公司 | Broadband power amplifier systems and methods |
| CN106470014A (en) * | 2015-08-17 | 2017-03-01 | 飞思卡尔半导体公司 | Having harmonic wave prevents the output impedance matching networks of circuit |
| CN107147365A (en) * | 2017-04-27 | 2017-09-08 | 中国科学院微电子研究所 | A kind of Class E power amplifiers |
| CN107453731A (en) * | 2017-08-16 | 2017-12-08 | 湖南时变通讯科技有限公司 | A kind of radio-frequency power synthesizer |
| CN110289819A (en) * | 2019-07-04 | 2019-09-27 | 广东工业大学 | A kind of output matching network of radio-frequency front-end and its radio-frequency power amplifier |
-
2008
- 2008-11-24 CN CNA2008100439827A patent/CN101478288A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101667810B (en) * | 2009-09-29 | 2011-11-16 | 锐迪科科技有限公司 | Chip of double-frequency radio-frequency power amplifier circuit |
| CN102098009A (en) * | 2010-12-20 | 2011-06-15 | 芯通科技（成都）有限公司 | Output match circuit of radio frequency (RF) power amplifier and design method thereof |
| CN102255606A (en) * | 2011-07-25 | 2011-11-23 | 中国科学院微电子研究所 | Solid-state RF (radio frequency) power supply based on E-power amplifying circuit |
| CN102969986B (en) * | 2012-11-19 | 2015-07-08 | 苏州远创达科技有限公司 | Output circuit structure of radio frequency power amplifier |
| CN102969986A (en) * | 2012-11-19 | 2013-03-13 | 苏州远创达科技有限公司 | Output circuit structure of radio frequency power amplifier |
| CN106416061A (en) * | 2014-04-29 | 2017-02-15 | 天工方案公司 | Broadband power amplifier systems and methods |
| CN106416061B (en) * | 2014-04-29 | 2018-09-11 | 天工方案公司 | Wideband power amplifer system and method |
| CN104579189A (en) * | 2015-02-04 | 2015-04-29 | 广东工业大学 | Circuit structure for improving harmonic performance of radio frequency power amplifier |
| CN104716906A (en) * | 2015-04-03 | 2015-06-17 | 广东工业大学 | Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier |
| CN106470014A (en) * | 2015-08-17 | 2017-03-01 | 飞思卡尔半导体公司 | Having harmonic wave prevents the output impedance matching networks of circuit |
| CN107147365A (en) * | 2017-04-27 | 2017-09-08 | 中国科学院微电子研究所 | A kind of Class E power amplifiers |
| CN107147365B (en) * | 2017-04-27 | 2020-12-11 | 中国科学院微电子研究所 | Class-E power amplifier |
| CN107453731A (en) * | 2017-08-16 | 2017-12-08 | 湖南时变通讯科技有限公司 | A kind of radio-frequency power synthesizer |
| CN110289819A (en) * | 2019-07-04 | 2019-09-27 | 广东工业大学 | A kind of output matching network of radio-frequency front-end and its radio-frequency power amplifier |
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Open date: 20090708 |