CN101674051A - Method for improving efficiency of radio frequency power amplifier and radio frequency power amplifier circuit - Google Patents
Method for improving efficiency of radio frequency power amplifier and radio frequency power amplifier circuit Download PDFInfo
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- CN101674051A CN101674051A CN200910057931A CN200910057931A CN101674051A CN 101674051 A CN101674051 A CN 101674051A CN 200910057931 A CN200910057931 A CN 200910057931A CN 200910057931 A CN200910057931 A CN 200910057931A CN 101674051 A CN101674051 A CN 101674051A
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Abstract
The invention discloses a method for improving the efficiency of a radio frequency power amplifier and a radio frequency power amplifier circuit which is adopted in order to realize the method. The radio frequency power amplifier circuit comprises a radio frequency power amplifier and an output matching network, wherein the output of the radio frequency power amplifier is connected to an output end of the radio frequency power amplifier circuit through the output matching network, as well as a secondary harmonic low-resistance network and a higher harmonic low-resistance network so that both the secondary harmonic impedance and the higher harmonic impedance of the output matching network are very low, and the triple harmonic impedance is very high. In the invention, the output of the radiofrequency power amplifier is connected with the secondary harmonic low-resistance network and the higher harmonic low-resistance network, thereby effectively inhibiting the secondary harmonic wave, the triple harmonic wave and the higher harmonic wave, greatly improving the efficiency of the radio frequency power amplifier and reducing the harmonic distortion of the radio frequency power amplifier.
Description
Technical field
The present invention relates to a kind of method of improving circuit performance, especially a kind of method that improves efficiency of RF power amplifier.The invention still further relates to a kind of radio frequency analog circuit, especially 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 can reflect that radio-frequency power amplifier converts direct current power the ability of radio-frequency power to, can reflect that again radio-frequency power amplifier amplifies the ability of radiofrequency signal power.
Existing radio-frequency (RF) power amplifier circuit as shown in Figure 1, radio-frequency power amplifier is connected to output by an output matching network.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 is lower than a certain value, not conducting of transistor promptly occurs one section not in the service area in the signal period, make distorted signals.For improving the power output of radio-frequency power amplifier, simultaneously higher efficient, existing technology being arranged again 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 further 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 method that improves efficiency of RF power amplifier, and realize the radio-frequency (RF) power amplifier circuit that this method adopts, can effectively suppress second harmonic, triple-frequency harmonics and high order harmonic component, significantly improve the efficient of radio-frequency power amplifier, 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, radio-frequency (RF) power amplifier circuit comprises radio-frequency power amplifier and output matching network, the output of described radio-frequency power amplifier is connected to the output of radio-frequency (RF) power amplifier circuit by described output matching network, output at described radio-frequency power amplifier also is connected with second harmonic lowohmic network and high order harmonic component lowohmic network, make that the second harmonic impedance and the high order harmonic component impedance of described output matching network are all very low, and the triple-frequency harmonics impedance is very high.
The present invention also provides a kind of radio-frequency (RF) power amplifier circuit that method adopted that realizes above-mentioned raising efficiency of RF power amplifier, its technical scheme is, comprise radio-frequency power amplifier and output matching network, the output of described radio-frequency power amplifier is connected to the output of radio-frequency (RF) power amplifier circuit by described output matching network, output at described radio-frequency power amplifier also is connected with second harmonic lowohmic network and high order harmonic component lowohmic network, make that the second harmonic impedance and the high order harmonic component impedance of described output matching network are all very low, and the triple-frequency harmonics impedance is very high.
The present invention connects second harmonic lowohmic network and high order harmonic component lowohmic network by the output at radio-frequency power amplifier, second harmonic, triple-frequency harmonics and high order harmonic component have effectively been suppressed, significantly improve the efficient of radio-frequency power amplifier, reduce 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;
Current-voltage waveform figure when Fig. 3 is the work of desirable F class radio-frequency (RF) power amplifier circuit;
Current-voltage waveform figure when Fig. 4 works for radio-frequency (RF) power amplifier circuit of the present invention.
Embodiment
The invention discloses a kind of method that improves efficiency of RF power amplifier, radio-frequency (RF) power amplifier circuit comprises radio-frequency power amplifier and output matching network, the output of described radio-frequency power amplifier is connected to the output of radio-frequency (RF) power amplifier circuit by described output matching network, output at described radio-frequency power amplifier also is connected with second harmonic lowohmic network and high order harmonic component lowohmic network, make that the second harmonic impedance and the high order harmonic component impedance of described output matching network are all very low, and the triple-frequency harmonics impedance is very high.
The present invention also provides a kind of radio-frequency (RF) power amplifier circuit that realizes the method for above-mentioned raising efficiency of RF power amplifier, as shown in Figure 2, comprise radio-frequency power amplifier and output matching network, the output of described radio-frequency power amplifier is connected to the output of radio-frequency (RF) power amplifier circuit by described output matching network, output at described radio-frequency power amplifier also is connected with second harmonic lowohmic network and high order harmonic component lowohmic network, make that the second harmonic impedance and the high order harmonic component impedance of described output matching network are all very low, and the triple-frequency harmonics impedance is very high.
Described output matching network comprises two inductance of series connection, and the two ends of a back inductance are respectively by a capacity earth.
Described second harmonic lowohmic network is included in an electric capacity and inductance that is connected in series between described power amplifier output and the ground, and an end of described electric capacity connects described power amplifier, an end ground connection of described inductance.
Described high order harmonic component lowohmic network comprises an electric capacity that is connected between described power amplifier output and the ground.
Circuit way of realization shown in Figure 2 is designed to example with GSM radio-frequency power amplifier output matching network.Output at radio-frequency power amplifier adds second harmonic lowohmic network and high order harmonic component lowohmic network, and promptly capacitor C 3 and C4 are parallel to ground.Wherein capacitor C 3 polyphone inductance L 4 form LC series resonance network LC34 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 directly is parallel to ground, and capacitor C 4 is used for the filtering high order harmonic component, makes that the output network of radio-frequency power amplifier is very low in the output impedance of high order harmonic component.The output that is connected in parallel to radio-frequency power amplifier by this second harmonic lowohmic network of LC34 and this high order harmonic component lowohmic network of C4 forms triple-frequency harmonics 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 approximate square wave, and the output end current rectification is a half-wave.Transistor can be similar to as a perfect switch in traditional desirable F class radio-frequency power amplifier, the impedance of high-order odd harmonic is infinitely great, and the impedance of high-order even-order harmonic is 0, therefore will include each odd harmonic composition in the transistor output voltage waveforms, make that the radio-frequency power amplifier output voltage is a square wave by full line; Include fundamental frequency composition and each high-order even-order harmonic composition in the transistor output current waveform, this electric current composition is identical with category-B radio-frequency power amplifier output current composition, and institute thinks the half period sine wave, as shown in Figure 3.Comprise the triple-frequency harmonics composition among the present invention in the transistor output voltage waveforms; Include fundamental frequency composition and the above odd harmonic composition of each high-order even-order harmonic and three rank in the transistor output current waveform, so the radio-frequency power amplifier output end voltage is shaped as approximate square wave, and the output end current rectification is a half-wave, as Fig. 4.Because harmonic power P
n=I
nU
n, wherein n is a harmonic order, works as U
n＞0 o'clock, I
n≈ 0; Work as I
n＞0 o'clock, U
n≈ 0, so P
n≈ 0.Adopt the efficient of radio-frequency power amplifier of the present invention can reach more than 70%, harmonic wave suppresses to reach more than the 70dBc.
In said process, the second harmonic lowohmic network of actual radio frequency power amplifier and high order harmonic component lowohmic network are determined by physical circuit.
In sum, the present invention adds second harmonic lowohmic network and high order harmonic component lowohmic network in the output of radio-frequency power amplifier, make that the second harmonic impedance of radio-frequency power amplifier output matching network is very low, triple-frequency harmonics impedance simultaneously is very high, and the high order harmonic component impedance is very low.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.Therefore, no matter second harmonic still be three times or more the high order harmonic component frequency all do not have harmonic power and produce, thereby greatly improved the efficient of radio-frequency power amplifier, and suppressed second harmonic, triple-frequency harmonics and high order harmonic component effectively, reduced the harmonic distortion of radio-frequency power amplifier.
Claims (5)
1. method that improves efficiency of RF power amplifier, radio-frequency (RF) power amplifier circuit comprises radio-frequency power amplifier and output matching network, the output of described radio-frequency power amplifier is connected to the output of radio-frequency (RF) power amplifier circuit by described output matching network, it is characterized in that, output at described radio-frequency power amplifier also is connected with second harmonic lowohmic network and high order harmonic component lowohmic network, make that the second harmonic impedance and the high order harmonic component impedance of described output matching network are all very low, and the triple-frequency harmonics impedance is very high.
2. a realization improves the radio-frequency (RF) power amplifier circuit of the method for efficiency of RF power amplifier according to claim 1, comprise radio-frequency power amplifier and output matching network, the output of described radio-frequency power amplifier is connected to the output of radio-frequency (RF) power amplifier circuit by described output matching network, it is characterized in that, output at described radio-frequency power amplifier also is connected with second harmonic lowohmic network and high order harmonic component lowohmic network, make that the second harmonic impedance and the high order harmonic component impedance of described output matching network are all very low, and the triple-frequency harmonics impedance is very high.
3. radio-frequency (RF) power amplifier circuit according to claim 2 is characterized in that, described output matching network comprises two inductance of series connection, and the two ends of a back inductance are respectively by a capacity earth.
4. radio-frequency (RF) power amplifier circuit according to claim 2, it is characterized in that, described second harmonic lowohmic network is included in an electric capacity and inductance that is connected in series between described power amplifier output and the ground, one end of described electric capacity connects described power amplifier, an end ground connection of described inductance.
5. radio-frequency (RF) power amplifier circuit according to claim 2 is characterized in that, described high order harmonic component lowohmic network comprises an electric capacity that is connected between described power amplifier output and the ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910057931A CN101674051A (en) | 2009-09-22 | 2009-09-22 | Method for improving efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
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| CN200910057931A CN101674051A (en) | 2009-09-22 | 2009-09-22 | Method for improving efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882910A (en) * | 2010-04-30 | 2010-11-10 | 苏州英诺迅科技有限公司 | Output matching circuit for improving power added efficiency and linearity of power amplifier |
| CN101888212A (en) * | 2010-04-30 | 2010-11-17 | 苏州英诺迅科技有限公司 | Circuit structure capable of increasing linearity and power added efficiency of power amplifier |
| 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 |
| CN102270968A (en) * | 2010-06-03 | 2011-12-07 | 中国科学院微电子研究所 | Off-chip harmonic wave absorbing circuit |
| CN102570991A (en) * | 2012-02-22 | 2012-07-11 | 刘轶 | Output matching circuit of radio frequency (RF) power amplifier |
| CN103716870A (en) * | 2013-12-31 | 2014-04-09 | 北京朗波芯微技术有限公司 | Power control device for mobile communication terminal |
| CN104506143A (en) * | 2014-12-25 | 2015-04-08 | 天津大学 | High-order harmonic suppression circuit for 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 |
| CN105262446A (en) * | 2015-10-23 | 2016-01-20 | 锐迪科创微电子（北京）有限公司 | Multilevel radio-frequency power amplification circuit |
| CN105471397A (en) * | 2015-12-11 | 2016-04-06 | 锐迪科创微电子（北京）有限公司 | Double-frequency radio frequency power amplification module |
| CN106253866A (en) * | 2016-08-03 | 2016-12-21 | 苏州能讯高能半导体有限公司 | A kind of power amplifier |
| CN107370460A (en) * | 2017-07-12 | 2017-11-21 | 深圳国民飞骧科技有限公司 | A kind of circuit structure and method for improving radio-frequency power amplifier harmonic inhibition capability |
| CN107528548A (en) * | 2017-08-29 | 2017-12-29 | 清华大学 | Broadband multi-frequency power amplifier based on more impedance zero point intermodulation matching networks |
-
2009
- 2009-09-22 CN CN200910057931A patent/CN101674051A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888212A (en) * | 2010-04-30 | 2010-11-17 | 苏州英诺迅科技有限公司 | Circuit structure capable of increasing linearity and power added efficiency of power amplifier |
| CN101888212B (en) * | 2010-04-30 | 2012-10-31 | 苏州英诺迅科技有限公司 | Circuit structure capable of increasing linearity and power added efficiency of power amplifier |
| CN101882910A (en) * | 2010-04-30 | 2010-11-10 | 苏州英诺迅科技有限公司 | Output matching circuit for improving power added efficiency and linearity of power amplifier |
| CN102270968A (en) * | 2010-06-03 | 2011-12-07 | 中国科学院微电子研究所 | Off-chip harmonic wave absorbing circuit |
| CN102270968B (en) * | 2010-06-03 | 2013-08-28 | 中国科学院微电子研究所 | Off-chip harmonic wave absorbing 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 |
| CN102570991A (en) * | 2012-02-22 | 2012-07-11 | 刘轶 | Output matching circuit of radio frequency (RF) power amplifier |
| 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 |
| CN103716870A (en) * | 2013-12-31 | 2014-04-09 | 北京朗波芯微技术有限公司 | Power control device for mobile communication terminal |
| CN104506143A (en) * | 2014-12-25 | 2015-04-08 | 天津大学 | High-order harmonic suppression circuit for radio frequency power amplifier |
| CN104506143B (en) * | 2014-12-25 | 2018-04-03 | 天津大学 | A kind of radio-frequency power amplifier limitation of high harmonics circuit |
| 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 |
| CN105262446A (en) * | 2015-10-23 | 2016-01-20 | 锐迪科创微电子（北京）有限公司 | Multilevel radio-frequency power amplification circuit |
| CN105471397A (en) * | 2015-12-11 | 2016-04-06 | 锐迪科创微电子（北京）有限公司 | Double-frequency radio frequency power amplification module |
| CN106253866A (en) * | 2016-08-03 | 2016-12-21 | 苏州能讯高能半导体有限公司 | A kind of power amplifier |
| CN107370460A (en) * | 2017-07-12 | 2017-11-21 | 深圳国民飞骧科技有限公司 | A kind of circuit structure and method for improving radio-frequency power amplifier harmonic inhibition capability |
| CN107370460B (en) * | 2017-07-12 | 2021-07-27 | 深圳飞骧科技有限公司 | Circuit structure and method for improving harmonic suppression capability of radio frequency power amplifier |
| CN107528548A (en) * | 2017-08-29 | 2017-12-29 | 清华大学 | Broadband multi-frequency power amplifier based on more impedance zero point intermodulation matching networks |
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