JPH06132735A - Feed forward amplifier - Google Patents
Feed forward amplifierInfo
- Publication number
- JPH06132735A JPH06132735A JP4276394A JP27639492A JPH06132735A JP H06132735 A JPH06132735 A JP H06132735A JP 4276394 A JP4276394 A JP 4276394A JP 27639492 A JP27639492 A JP 27639492A JP H06132735 A JPH06132735 A JP H06132735A
- Authority
- JP
- Japan
- Prior art keywords
- distortion
- input
- signal
- inputted
- main amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、通信システム等に使用
する、主増幅器による非直線歪を相殺して出力する線形
増幅器であるフィードフォワード増幅器の改良に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a feedforward amplifier, which is a linear amplifier for use in a communication system or the like, which cancels out non-linear distortion due to a main amplifier and outputs the cancelled nonlinear distortion.
【０００２】[0002]
【従来の技術】図３は従来例のフィードフォワード増幅
器のブロック図である。図３では、入力信号は、歪摘出
手段５０の電力分配器３０にて２分配され、一方は主増
幅器２に入力し、他方は減衰器３４に入力し、主増幅器
２では増幅され電力合成器３１に入力し、信号源３３よ
りの入力信号とは無関係な周波数の信号とを合成し、電
力分配器３２に入力して２分配され、一方は歪除去手段
５１の遅延線路３７に入力し、他方は電力合成器３６に
入力する。2. Description of the Related Art FIG. 3 is a block diagram of a conventional feedforward amplifier. In FIG. 3, the input signal is divided into two by the power distributor 30 of the distortion extracting means 50, one of which is input to the main amplifier 2 and the other of which is input to the attenuator 34. 31 and a signal of a frequency irrelevant to the input signal from the signal source 33 is combined and input to the power divider 32 and divided into two, one of which is inputted to the delay line 37 of the distortion removing means 51, The other is input to the power combiner 36.
【０００３】減衰器３４では減衰され遅延線路３５に入
力し遅延され電力合成器３６に入力するも、減衰器３
４，遅延線路３５では、入力信号が、主増幅器２，電力
合成器３１，電力分配器３２を経て電力合成器３６に入
力する信号と同レベルで逆位相になるようにし、電力合
成器３６の出力では、主増幅器２による非直線歪と、信
号源３３よりの信号とを取り出し、歪除去手段５１の可
変減衰器４０に入力し減衰され、移相器４１に入力し位
相が変えられ、補助増幅器３９にて増幅され電力合成器
３８に入力する。In the attenuator 34, it is attenuated and input to the delay line 35 and delayed and input to the power combiner 36.
4. In the delay line 35, the input signal is made to have the same level and opposite phase to the signal input to the power combiner 36 via the main amplifier 2, the power combiner 31, and the power distributor 32, and the power combiner 36 At the output, the non-linear distortion due to the main amplifier 2 and the signal from the signal source 33 are taken out, inputted to the variable attenuator 40 of the distortion removing means 51 and attenuated, and inputted to the phase shifter 41 so that the phase is changed and the auxiliary It is amplified by the amplifier 39 and input to the power combiner 38.
【０００４】遅延線路３７に入力した、主増幅器２の非
直線歪を含む出力信号と、信号源３３よりの信号とを含
む信号は、電力合成器３８に入力し、補助増幅器３９よ
り入力する主増幅器２の非直線歪及び信号源３３よりの
信号と相殺され、電力分配器４２に入力し２分配され、
一方は出力信号となり、他方は信号源３３よりの信号を
通すバンドパスフィルタ４３に入力し、相殺しても尚残
留した、信号源３３よりの信号が取り出され同期検波回
路４４に入力する。A signal including a non-linear distortion output signal of the main amplifier 2 and a signal from the signal source 33, which is input to the delay line 37, is input to the power combiner 38 and is input from the auxiliary amplifier 39. It is canceled by the non-linear distortion of the amplifier 2 and the signal from the signal source 33, input to the power divider 42 and divided into two,
One becomes an output signal, and the other is input to the bandpass filter 43 that allows the signal from the signal source 33 to pass, and the signal from the signal source 33 that remains even after cancellation is extracted and input to the synchronous detection circuit 44.
【０００５】同期検波回路４４には信号源３３より信号
が入力しており、同期検波することにより残留した信号
源３３よりの信号が取り出され、制御回路４５に入力
し、制御回路４５では、可変減衰器４０，移相器４１を
制御し、同期検波回路４４より入力する残留した信号源
３３よりの信号が最小になるように制御し、主増幅器２
にて生ずる非直線歪も取り除くようにしている。A signal is input from the signal source 33 to the synchronous detection circuit 44, and the signal from the remaining signal source 33 is extracted by the synchronous detection and input to the control circuit 45. The attenuator 40 and the phase shifter 41 are controlled so that the residual signal from the signal source 33 input from the synchronous detection circuit 44 is minimized, and the main amplifier 2
The non-linear distortion caused by is also removed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、温度変
動があると信号源３３の出力信号の周波数が変わりバン
ドパスフィルタ４３を通らなくなり、主増幅器２にて生
ずる非直線歪を十分取り除けなくなる問題点と、信号源
３３の出力信号が空間及び電源廻りにて、電力分配器４
２及び補助増幅器３９に入力すると、この入力した信号
源３３の出力信号は取り除けない問題点がある。However, if there is a temperature change, the frequency of the output signal of the signal source 33 changes, and the bandpass filter 43 cannot be passed through, so that the non-linear distortion generated in the main amplifier 2 cannot be sufficiently removed. , The output signal of the signal source 33 is in the space and around the power source, and the power distributor 4
2 and the auxiliary amplifier 39, the output signal of the input signal source 33 cannot be removed.
【０００７】本発明は、入力信号と無関係な周波数を出
力する信号源を用いなくとも、主増幅器にて生ずる非直
線歪を取り除くことが出来るフィードフォワード増幅器
の提供を目的としている。It is an object of the present invention to provide a feedforward amplifier capable of removing the non-linear distortion generated in the main amplifier without using a signal source which outputs a frequency unrelated to the input signal.
【０００８】[0008]
【課題を解決するための手段】図１は本発明の原理ブロ
ック図である。図１に示す如く、入力された信号を、第
１の電力分配器１で２分配し、一方は主増幅器２に入力
し、他方は残留歪摘出手段３に入力し、歪摘出手段４に
て摘出した該主増幅器２による非直線歪を、歪除去手段
５の可変減衰器６及び移相器７を通して該主増幅器２の
出力に加え非直線歪を相殺し、相殺した信号を第２の電
力分配器８に入力して２分配し、一方は出力信号とし、
他方は該残留歪摘出手段３に入力し、摘出した残留歪成
分を制御回路９に入力し、該制御回路９にて該可変減衰
器６及び移相器７を制御し、入力する残留歪成分を最小
にする構成とする。FIG. 1 is a block diagram showing the principle of the present invention. As shown in FIG. 1, the input signal is divided into two by the first power divider 1, one is inputted to the main amplifier 2, the other is inputted to the residual distortion extracting means 3 and the distortion extracting means 4 is inputted. The extracted non-linear distortion by the main amplifier 2 is added to the output of the main amplifier 2 through the variable attenuator 6 and the phase shifter 7 of the distortion removing means 5 to cancel the non-linear distortion, and the canceled signal is supplied with the second power. It is input to the distributor 8 and divided into two, one of which is an output signal,
The other is input to the residual distortion extracting means 3 and the extracted residual distortion component is input to the control circuit 9. The control circuit 9 controls the variable attenuator 6 and the phase shifter 7 to input the residual distortion component. To minimize.
【０００９】[0009]
【作用】本発明によれば、歪摘出手段４にて摘出した主
増幅器２による非直線歪を、可変減衰器６及び移相器７
を通して主増幅器２の出力に加え、非直線歪を相殺する
時、残留歪摘出手段３にて摘出した残留歪が最小になる
ように、制御回路９にて可変減衰器６及び移相器７を制
御するので、信号源がなくとも主増幅器２による非直線
歪を除去することが出来る。According to the present invention, the non-linear distortion due to the main amplifier 2 extracted by the distortion extracting means 4 is eliminated by the variable attenuator 6 and the phase shifter 7.
In addition to the output of the main amplifier 2 through, the control circuit 9 controls the variable attenuator 6 and the phase shifter 7 so that the residual distortion extracted by the residual distortion extracting means 3 is minimized when the nonlinear distortion is canceled. Since the control is performed, the non-linear distortion due to the main amplifier 2 can be removed without the signal source.
【００１０】[0010]
【実施例】図２は本発明の実施例のフィードフォワード
増幅器のブロック図である。図２では、入力信号は、電
力分配器１にて２分配し、一方は、歪摘出手段４の電力
分配器１０に入力し、他方は残留歪摘出手段３の遅延線
路１８に入力する。2 is a block diagram of a feedforward amplifier according to an embodiment of the present invention. In FIG. 2, the input signal is divided into two by the power distributor 1, one of which is input to the power distributor 10 of the distortion extracting unit 4 and the other of which is input to the delay line 18 of the residual distortion extracting unit 3.
【００１１】電力分配器１０では、入力信号を２分配
し、一方は主増幅器２に入力し、他方は減衰器１１に入
力し、主増幅器２では増幅され電力分配器１３に入力
し、２分配され、一方は歪除去手段５の遅延線路１５に
入力し、他方は電力合成器１４に入力する。In the power divider 10, the input signal is divided into two, one of which is input to the main amplifier 2 and the other of which is input to the attenuator 11, which is amplified by the main amplifier 2 and input to the power divider 13 to be divided into two. One is input to the delay line 15 of the distortion removing means 5, and the other is input to the power combiner 14.
【００１２】減衰器１１では減衰され遅延線路１２に入
力し遅延され電力合成器１４に入力するも、減衰器１
１，遅延線路１２では、入力信号が主増幅器２，電力分
配器１３を経て電力合成器１４に入力する信号と同じレ
ベルで逆位相になるようにするので、電力合成器１４の
出力では主増幅器２による非直線歪が摘出され、歪除去
手段５の可変減衰器６に入力する。In the attenuator 11, the data is attenuated and input to the delay line 12 and then delayed and input to the power combiner 14.
1. In the delay line 12, the input signal is made to have the same level and opposite phase as the signal input to the power combiner 14 via the main amplifier 2 and the power distributor 13, so that the output of the power combiner 14 is the main amplifier. The non-linear distortion due to 2 is extracted and input to the variable attenuator 6 of the distortion removing means 5.
【００１３】遅延線路１５に入力した、主増幅器２によ
る非直線歪を含む出力信号は、電力合成器１６に入力
し、補助増幅器１７より入力する主増幅器２の非直線歪
と相殺され、電力分配器８に入力し２分配され、一方は
出力信号となり、他方は電力合成器２０に入力する。The output signal including the non-linear distortion by the main amplifier 2 which is input to the delay line 15 is input to the power combiner 16 and is canceled by the non-linear distortion of the main amplifier 2 input by the auxiliary amplifier 17 to distribute the power. The output signal is input to the power combiner 20 and the other is input to the power combiner 20.
【００１４】遅延線路１８に入力した非直線歪のない信
号は、遅延線路１８にて、入力信号が主増幅器２及び各
所を通り電力分配器８より電力合成器２０に入力する信
号と逆位相にされ電力合成器２０に入力し、出力より残
留歪を出力し検波回路１９に入力し、検波回路１９にて
残留歪を検出し制御回路９に入力する。In the delay line 18, the non-linear distortion-free signal input to the delay line 18 has an opposite phase to the signal input to the power combiner 20 from the power distributor 8 through the main amplifier 2 and various places. Then, the residual distortion is output from the output to the power combiner 20, the residual distortion is input to the detection circuit 19, the residual distortion is detected by the detection circuit 19, and the residual distortion is input to the control circuit 9.
【００１５】可変減衰器６に入力した非直線歪の信号は
可変減衰器６及び移相器７を通り補助増幅器１７に入力
し増幅され電力合成器１６に入力し、電力合成器１６で
は、主増幅器２による非直線歪を含む出力信号とが合成
され非直線歪を相殺するようにし、電力分配器８を経て
出力信号となるが、制御回路９では、可変減衰器６及び
移相器７を制御し、制御回路９に入力する残留歪成分が
最小になるようにし、主増幅器２による非直線歪を除去
するようにする。The non-linear distortion signal input to the variable attenuator 6 passes through the variable attenuator 6 and the phase shifter 7, is input to the auxiliary amplifier 17, is amplified, and is input to the power combiner 16. The output signal including the non-linear distortion by the amplifier 2 is combined to cancel the non-linear distortion, and becomes an output signal through the power distributor 8. In the control circuit 9, the variable attenuator 6 and the phase shifter 7 are connected. The residual distortion component input to the control circuit 9 is controlled to be minimum, and the non-linear distortion due to the main amplifier 2 is removed.
【００１６】即ち、信号源を用いずに主増幅器２による
非直線歪を除去出来るので、空間及び電源から不要信号
が入力することもなく、又温度変動があつても、主増幅
器２による非直線歪を除去することが出来る。That is, since the non-linear distortion by the main amplifier 2 can be removed without using a signal source, an unnecessary signal is not input from the space and the power source, and the non-linear distortion by the main amplifier 2 is caused even if the temperature changes. The distortion can be removed.
【００１７】[0017]
【発明の効果】以上詳細に説明せる如く本発明によれ
ば、入力信号と無関係な信号を出力する信号源を用いず
に、主増幅器により生ずる非直線歪を除去するフィード
フォワード増幅器が得られる効果がある。As described in detail above, according to the present invention, it is possible to obtain a feedforward amplifier which eliminates the non-linear distortion generated by the main amplifier without using a signal source which outputs a signal unrelated to the input signal. There is.
【図１】は本発明の原理ブロック図、FIG. 1 is a block diagram of the principle of the present invention,
【図２】は本発明の実施例のフィードフォワード増幅器
のブロック図、FIG. 2 is a block diagram of a feedforward amplifier according to an embodiment of the present invention,
【図３】は従来例のフィードフォワード増幅器のブロッ
ク図である。FIG. 3 is a block diagram of a conventional feedforward amplifier.
１，８，１０，１３，３０，４２は電力分配器、２は主
増幅器、３は残留歪摘出手段、４，５０は歪摘出手段、
５，５１は歪除去手段、６，４０は可変減衰器、７，４
１は移相器、９，４５は制御回路、１１，３４は減衰
器、１２，１５，１８，３５，３７は遅延線路、１４，
１６，２０，３１，３６，３８は電力合成器、１７，３
９は補助増幅器、１９は検波回路、３１は信号源、４３
はバンドパスフィルタ、４４は同期検波回路を示す。1, 8, 10, 13, 30, and 42 are power distributors, 2 is a main amplifier, 3 is residual distortion extracting means, 4 and 50 are distortion extracting means,
5, 51 are distortion removing means, 6, 40 are variable attenuators, 7, 4
1 is a phase shifter, 9 and 45 are control circuits, 11 and 34 are attenuators, 12, 15, 18, 35 and 37 are delay lines, 14,
16, 20, 31, 36, 38 are power combiners, 17, 3
9 is an auxiliary amplifier, 19 is a detection circuit, 31 is a signal source, 43
Is a bandpass filter, and 44 is a synchronous detection circuit.
Claims (1)
（１）で２分配し、一方は主増幅器（２）に入力し、他
方は残留歪摘出手段（３）に入力し、 歪摘出手段（４）にて摘出した該主増幅器（２）による
非直線歪を、歪除去手段（５）の可変減衰器（６）及び
移相器（７）を通して該主増幅器（２）の出力に加え非
直線歪を相殺し、相殺した信号を第２の電力分配器
（８）に入力して２分配し、一方は出力信号とし、他方
は該残留歪摘出手段（３）に入力し、摘出した残留歪成
分を制御回路（９）に入力し、該制御回路（９）にて該
可変減衰器（６）及び移相器（７）を制御し、入力する
残留歪成分を最小にすることを特徴とするフィードフォ
ワード増幅器。1. The input signal is divided into two by a first power divider (1), one is inputted to a main amplifier (2) and the other is inputted to a residual distortion extracting means (3), The non-linear distortion by the main amplifier (2) extracted by the extracting means (4) is output from the main amplifier (2) through the variable attenuator (6) and the phase shifter (7) of the distortion removing means (5). In addition to canceling out the non-linear distortion, the canceled signal is input to the second power divider (8) and divided into two, one of which is an output signal and the other is inputted to the residual distortion extracting means (3), The extracted residual distortion component is input to the control circuit (9), and the control circuit (9) controls the variable attenuator (6) and the phase shifter (7) to minimize the input residual distortion component. A feed forward amplifier characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4276394A JPH06132735A (en) | 1992-10-15 | 1992-10-15 | Feed forward amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4276394A JPH06132735A (en) | 1992-10-15 | 1992-10-15 | Feed forward amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06132735A true JPH06132735A (en) | 1994-05-13 |
Family
ID=17568801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4276394A Pending JPH06132735A (en) | 1992-10-15 | 1992-10-15 | Feed forward amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06132735A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100309808B1 (en) * | 1996-07-23 | 2001-09-29 | 스펙트리안 | Rf amplifier having adaptative predistortion circuit |
| KR100318919B1 (en) * | 1998-07-07 | 2002-07-12 | 윤종용 | Precompensator with automatic gain control circuit and precompensation method using it |
| ES2262427A1 (en) * | 2005-03-23 | 2006-11-16 | Angel Iglesias, S.A. | Non-linear distortion measurement and monitoring system for linearization devices has attenuator for equalizing magnitudes of useful signal in useful channel and distortion signal in adjacent channel |
-
1992
- 1992-10-15 JP JP4276394A patent/JPH06132735A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100309808B1 (en) * | 1996-07-23 | 2001-09-29 | 스펙트리안 | Rf amplifier having adaptative predistortion circuit |
| KR100318919B1 (en) * | 1998-07-07 | 2002-07-12 | 윤종용 | Precompensator with automatic gain control circuit and precompensation method using it |
| ES2262427A1 (en) * | 2005-03-23 | 2006-11-16 | Angel Iglesias, S.A. | Non-linear distortion measurement and monitoring system for linearization devices has attenuator for equalizing magnitudes of useful signal in useful channel and distortion signal in adjacent channel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
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