CN102075147A - Radio-frequency power amplifier method and feed-forward power amplifier - Google Patents
Radio-frequency power amplifier method and feed-forward power amplifier Download PDFInfo
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- CN102075147A CN102075147A CN2010106186805A CN201010618680A CN102075147A CN 102075147 A CN102075147 A CN 102075147A CN 2010106186805 A CN2010106186805 A CN 2010106186805A CN 201010618680 A CN201010618680 A CN 201010618680A CN 102075147 A CN102075147 A CN 102075147A
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Abstract
The invention is suitable for the wireless communication field, and provides a radio-frequency power amplifier method and a feed-forward power amplifier. In the embodiment of the invention, a high-level carrier signal is extracted from an input end of a last-stage power amplifier (a main power amplifier), and since the extracted signal is large, a larger error signal can be directly obtained. The gain of an auxiliary amplifier is greatly reduced, the anti-interference capacity of the power amplifier is greatly improved, the production difficulty is also greatly reduced at the same time, and the producibility is improved; and at the same time, the relative time delay of the error signal and the main signal is small, so a time delay wire on the output end of the main power amplifier can be shorter, the loss of the time delay wire is smaller, and the efficiency of the power amplifier can be improved.
Description
Technical field
The invention belongs to wireless communication field, relate in particular to a kind of method and Feed Forward Power Amplifier of radio-frequency (RF) power amplification.
Background technology
Consult Fig. 1, be traditional Feed Forward Power Amplifier schematic diagram, input signal at first is divided into two-way by the power splitter of power amplifier input, one the tunnel delivers to main power amplifier amplification will produce additional nonlinear distortion, this signal is through sampling coupler coupling, and a part and another road signal after by delay line synthesizes at the electric bridge synthesizer.Can the two paths of signals amplitude be equated by regulating adjustable attenuator and phase shifter, 180 ° of phase phasic differences, then the output of synthesizer will be an error signal.In essence, this error signal only comprises the nonlinear distortion that main amplifier produces in the ideal case.This error signal is amplified to required level through linearity, offsets most distortion at output.
Since error signal must from the power splitter of power amplifier input along separate routes after, amplify through the prime identical with main power amplifier, its multiplication factor is very high, as easy as rolling off a log being interfered, and influence the linearity of power amplifier.In order to reduce to disturb, the shielding construction of traditional feed forward power amplifier is quite complicated, and cost is high.And the auxiliary power amplifier of traditional power amplifier must have very big gain just can finish the counteracting of signal.And owing to being made up of casacade multi-amplifier of auxiliary power amplifier, the relative time delay of error signal and main signal can be very big, and therefore the delay line of main power amplifier output will be very long, causes the delay line loss bigger, reduced the efficient of power amplifier.And the susceptibility that system is disturbed is very big, manufactures difficulty, and debugging work load is big, is difficult to produce.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of the embodiment of the invention is to provide a kind of Feed Forward Power Amplifier.
The embodiment of the invention is to realize like this, a kind of Feed Forward Power Amplifier, comprise: first pre-amplifier of two series connection of the signal input part of connection Feed Forward Power Amplifier, second pre-amplifier, and the main power amplifier that connects second pre-amplifier, input at described main power amplifier connects the first sampling coupler, the described first sampling coupler is connected to first adjustable attenuator by first delay line, described first adjustable attenuator is connected to the input of electric bridge synthesizer by first adjustable phase shifter, output at described main power amplifier connects the second sampling coupler, the described second sampling coupler is connected with another input of described electric bridge synthesizer by attenuator, the output of described electric bridge synthesizer is by second adjustable attenuator, second adjustable phase shifter is connected to the auxiliary power amplifier input terminal, the output of described auxiliary power amplifier is connected to the input of the 3rd sampling coupler, the output of described main power amplifier also is connected to another input of the 3rd sampling coupler by second delay line, the output of described the 3rd sampling coupler is the last output of this Feed Forward Power Amplifier.
Further, described second pre-amplifier is the prime driving amplifier.
Another purpose of the embodiment of the invention is to provide a kind of method of radio-frequency (RF) power amplification, and described method comprises the steps:
A. input signal S0 is through the amplification of small-signal and the amplification of promotion level, output signal S1;
B. after signal S1 amplifies through main power amplifier again, output signal S2;
C. use the input extraction unit sub-signal P1 of first coupler at described main power amplifier;
D. use the output extraction unit sub-signal P2 of second coupler at described main power amplifier;
E. signal P1, P2 are carried out the counteracting of main carrier, and carry out the adjustment of amplitude and phase place, and draw error signal M through the amplification of booster amplifier through adjustable attenuator and adjustable phase shifter;
F. use the electric bridge synthesizer that the signal of error signal M and the described main power amplifier of process is carried out the counteracting of distorted signal, the signal behind the output offset.
In an embodiment of the present invention, extract the carrier signal of high level,, therefore can directly obtain bigger error signal because the signal itself that extracts is very big from the input of final stage power amplifier (main power amplifier).Significantly reduce the gain of booster amplifier, significantly improved the antijamming capability of power amplifier, also significantly reduced the production difficulty simultaneously, improved productibility; The relative time delay of error signal and main signal can be very little simultaneously, and therefore the delay line of main power amplifier output will be very short, and the delay line loss is less, has improved the efficient of power amplifier.
Description of drawings
Fig. 1 is the structure principle chart of the Feed Forward Power Amplifier that provides of prior art;
Fig. 2 is the structure principle chart of the Feed Forward Power Amplifier that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 2 shows the structural principle of the Feed Forward Power Amplifier that the embodiment of the invention provides, this Feed Forward Power Amplifier comprises: first pre-amplifier of two series connection of the signal input part of connection Feed Forward Power Amplifier, second pre-amplifier, and the main power amplifier that connects second pre-amplifier, input at described main power amplifier connects the first sampling coupler, the described first sampling coupler is connected to first adjustable attenuator by first delay line, described first adjustable attenuator is connected to the input of electric bridge synthesizer by first adjustable phase shifter, output at described main power amplifier connects the second sampling coupler, the described second sampling coupler is connected with another input of described electric bridge synthesizer by attenuator, the output of described electric bridge synthesizer is by second adjustable attenuator, second adjustable phase shifter is connected to the auxiliary power amplifier input terminal, the output of described auxiliary power amplifier is connected to the input of the 3rd sampling coupler, the output of described main power amplifier also is connected to another input of the 3rd sampling coupler by second delay line, the output of described the 3rd sampling coupler is the last output of this Feed Forward Power Amplifier.
Input signal (RF IN) is at first amplified (wherein by two pre-amplifiers (first pre-amplifier, second pre-amplifier), second pre-amplifier is the prime driving amplifier), input at main power amplifier takes out the part main signal by the first sampling coupler, this part main signal equates with part signal (being got by the second sampling coupler) amplitude that the output of main power amplifier takes out, 180 ° of phase phasic differences, like this, the output of electric bridge synthesizer has only an error signal that main carrier is offset.In essence, this error signal only comprises the nonlinear distortion that main power amplifier produces in the ideal case.Distorted signal is amplified to required level through the auxiliary power amplifier again, then, the 3rd sampling coupler is superimposed with error signal and main signal, same second adjustable attenuator and second adjustable phase shifter regulated, the two paths of signals amplitude is equated, 180 ° of phase phasic differences will have only the linear component signal at total output (RF OUT) in theory.Simultaneously because resulting error signal is very high, the auxiliary power amplifier magnification ratio is just less, so the relative time delay of error signal and main signal can be very little, and therefore the delay line of main power amplifier output will be very short, the delay line loss is less, has improved the efficient of power amplifier.
The present invention is based on two amplitudes and equate, the signal stack that the phase phasic difference is 180 ° is offset error signal on the amplifier output spectrum.
Embodiments of the invention also provide a kind of method of radio-frequency (RF) power amplification, and this method comprises the steps:
A. input signal S0 is through the amplification of small-signal and the amplification of promotion level, output signal S1;
B. after signal S1 amplifies through main power amplifier again, output signal S2;
C. use the input extraction unit sub-signal P1 of first coupler at described main power amplifier;
D. use the output extraction unit sub-signal P2 of second coupler at described main power amplifier;
E. signal P1, P2 are carried out the counteracting of main carrier, and carry out the adjustment of amplitude and phase place, and draw error signal M through the amplification of booster amplifier through adjustable attenuator and adjustable phase shifter;
F. use the electric bridge synthesizer that the signal of error signal M and the described main power amplifier of process is carried out the counteracting of distorted signal, the signal behind the output offset.
In sum, in the Feed Forward Power Amplifier provided by the invention, extract the carrier signal of high level,, therefore can directly obtain bigger error signal because the signal itself that extracts is very big from the input of final stage power amplifier (main power amplifier).Significantly reduce the gain of booster amplifier, significantly improved the antijamming capability of power amplifier, also significantly reduced the production difficulty simultaneously, improved productibility; The relative time delay of error signal and main signal can be very little simultaneously, and therefore the delay line of main power amplifier output will be very short, and the delay line loss is less, has improved the efficient of power amplifier.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. Feed Forward Power Amplifier, it is characterized in that, comprise: first pre-amplifier of two series connection of the signal input part of connection Feed Forward Power Amplifier, second pre-amplifier, and the main power amplifier that connects second pre-amplifier, input at described main power amplifier connects the first sampling coupler, the described first sampling coupler is connected to first adjustable attenuator by first delay line, described first adjustable attenuator is connected to the input of electric bridge synthesizer by first adjustable phase shifter, output at described main power amplifier connects the second sampling coupler, the described second sampling coupler is connected with another input of described electric bridge synthesizer by attenuator, the output of described electric bridge synthesizer is by second adjustable attenuator, second adjustable phase shifter is connected to the auxiliary power amplifier input terminal, the output of described auxiliary power amplifier is connected to the input of the 3rd sampling coupler, the output of described main power amplifier also is connected to another input of the 3rd sampling coupler by second delay line, the output of described the 3rd sampling coupler is the last output of this Feed Forward Power Amplifier.
2. Feed Forward Power Amplifier according to claim 1 is characterized in that, described second pre-amplifier is the prime driving amplifier.
3. the method for a radio-frequency (RF) power amplification is characterized in that, described method comprises the steps:
A. input signal S0 is through the amplification of small-signal and the amplification of promotion level, output signal S1;
B. after signal S1 amplifies through main power amplifier again, output signal S2;
C. use the input extraction unit sub-signal P1 of first coupler at described main power amplifier;
D. use the output extraction unit sub-signal P2 of second coupler at described main power amplifier;
E. signal P1, P2 are carried out the counteracting of main carrier, and carry out the adjustment of amplitude and phase place, and draw error signal M through the amplification of booster amplifier through adjustable attenuator and adjustable phase shifter;
F. use the electric bridge synthesizer that the signal of error signal M and the described main power amplifier of process is carried out the counteracting of distorted signal, the signal behind the output offset.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106186805A CN102075147A (en) | 2010-12-31 | 2010-12-31 | Radio-frequency power amplifier method and feed-forward power amplifier |
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| CN2010106186805A CN102075147A (en) | 2010-12-31 | 2010-12-31 | Radio-frequency power amplifier method and feed-forward power amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095228A (en) * | 2013-01-10 | 2013-05-08 | 三维通信股份有限公司 | Intermodulation suppression amplifying circuit and control method |
| CN103607175A (en) * | 2013-11-29 | 2014-02-26 | 深圳市虹远通信有限责任公司 | Radio frequency power amplifier device based on signal extraction counteraction |
| CN104270104A (en) * | 2014-09-25 | 2015-01-07 | 武汉虹信通信技术有限责任公司 | High-intermodulation power amplifier employing APD (Amplitude Probability Distribution) technology |
| CN108111129A (en) * | 2016-11-24 | 2018-06-01 | 株式会社村田制作所 | Power amplifier |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040189384A1 (en) * | 2001-06-29 | 2004-09-30 | Gerard Kemna | Feed forward amplifying circuit |
| CN101051818A (en) * | 2007-01-30 | 2007-10-10 | 深圳国人通信有限公司 | Intelligent control system and method for carrier cancellation in feedforward linear power amplifier |
| US20090302945A1 (en) * | 2008-06-05 | 2009-12-10 | Raytheon Canada Limited | Linearizing technique for power amplifiers |
| CN101789764A (en) * | 2010-03-09 | 2010-07-28 | 广州市圣大电子有限公司 | Radio frequency power amplifier |
-
2010
- 2010-12-31 CN CN2010106186805A patent/CN102075147A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040189384A1 (en) * | 2001-06-29 | 2004-09-30 | Gerard Kemna | Feed forward amplifying circuit |
| CN101051818A (en) * | 2007-01-30 | 2007-10-10 | 深圳国人通信有限公司 | Intelligent control system and method for carrier cancellation in feedforward linear power amplifier |
| US20090302945A1 (en) * | 2008-06-05 | 2009-12-10 | Raytheon Canada Limited | Linearizing technique for power amplifiers |
| CN101789764A (en) * | 2010-03-09 | 2010-07-28 | 广州市圣大电子有限公司 | Radio frequency power amplifier |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095228A (en) * | 2013-01-10 | 2013-05-08 | 三维通信股份有限公司 | Intermodulation suppression amplifying circuit and control method |
| CN103607175A (en) * | 2013-11-29 | 2014-02-26 | 深圳市虹远通信有限责任公司 | Radio frequency power amplifier device based on signal extraction counteraction |
| CN104270104A (en) * | 2014-09-25 | 2015-01-07 | 武汉虹信通信技术有限责任公司 | High-intermodulation power amplifier employing APD (Amplitude Probability Distribution) technology |
| CN108111129A (en) * | 2016-11-24 | 2018-06-01 | 株式会社村田制作所 | Power amplifier |
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Application publication date: 20110525 |