JPH05167356A - Distortion compensator - Google Patents
Distortion compensatorInfo
- Publication number
- JPH05167356A JPH05167356A JP32933891A JP32933891A JPH05167356A JP H05167356 A JPH05167356 A JP H05167356A JP 32933891 A JP32933891 A JP 32933891A JP 32933891 A JP32933891 A JP 32933891A JP H05167356 A JPH05167356 A JP H05167356A
- Authority
- JP
- Japan
- Prior art keywords
- directional coupler
- signal
- coupler
- distortion component
- 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、マイクロ波帯で使用さ
れる高効率の歪補償器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly efficient distortion compensator used in the microwave band.
【０００２】[0002]
【従来の技術】従来の歪補償器を第２図で説明する。2. Description of the Related Art A conventional distortion compensator will be described with reference to FIG.
【０００３】入力端子ＩＮから高周波信号が入力され
る。この高周波信号は、第一の方向性結合器１、帯域通
過フィルタ２を経て、電力増幅器３で増幅される。増幅
された高周波信号は、第二の方向性結合器４で、その一
部が取り出され帰還ループ５に加えられる。A high frequency signal is input from the input terminal IN. This high-frequency signal passes through the first directional coupler 1 and the bandpass filter 2 and is amplified by the power amplifier 3. A part of the amplified high frequency signal is taken out by the second directional coupler 4 and added to the feedback loop 5.
【０００４】この帰還ループ５に取り出された高周波信
号は、所望の帯域で位相が反転され、前記第一の方向性
結合器１で、入力端子ＩＮから入力される高周波信号と
結合し、いわゆる負帰還をかけ、電力増幅器３で発生す
る歪成分を補償する。歪成分の補償された高周波信号
は、電力増幅器３から第二の方向性結合器４を通り、出
力端子ＯＵＴから取り出される。The high frequency signal taken out to the feedback loop 5 has its phase inverted in a desired band and is combined with the high frequency signal input from the input terminal IN by the first directional coupler 1 to obtain a so-called negative signal. Feedback is applied to compensate the distortion component generated in the power amplifier 3. The high-frequency signal in which the distortion component has been compensated is taken out from the power amplifier 3 through the second directional coupler 4 and the output terminal OUT.
【０００５】[0005]
【発明が解決しようとする課題】上記の歪補償器におい
て、電力増幅器３の帯域が広い場合、帰還ループ５で所
望帯域の信号の位相は反転するが、それ以外の帯域の信
号については、位相が反転せずに正帰還となり、発振す
る可能性がある。これを防止するため所望の帯域の信号
だけを通過させる帯域通過フィルタ２を、電力増幅器３
の前に入れている。In the above distortion compensator, when the power amplifier 3 has a wide band, the feedback loop 5 inverts the phase of the signal in the desired band, but for the signals in other bands, the phase is reversed. May not be inverted, but may be positive feedback and may oscillate. In order to prevent this, a bandpass filter 2 that passes only a signal in a desired band is provided in the power amplifier 3
I put it in front of.
【０００６】しかし、帰還型歪補償器では、電力増幅器
の出力信号の一部を、そのまま位相を反転して負帰還を
かけているため、歪補償量を大きくしようとすると、帰
還ループの利得を大きくしなければならない。このた
め、電力増幅器の利得に比べ、負帰還増幅器の利得が減
少するという欠点があった。However, in the feedback type distortion compensator, a part of the output signal of the power amplifier is inverted as it is and negative feedback is applied. It has to be big. Therefore, there is a drawback that the gain of the negative feedback amplifier is reduced as compared with the gain of the power amplifier.
【０００７】[0007]
【課題を解決するための手段】本発明の歪補償器は、高
周波入力信号を、まず主信号と補助信号とに分配し、主
信号を電力増幅器で増幅する。この電力増幅器で増幅さ
れた主信号および前記主増幅器で発生した相互変調歪成
分の一部を取り出し、この取り出された信号と前記分配
された補助信号とを逆相で結合させ、電力増幅器で発生
した相互変調歪成分を取り出す。次に、この相互変調歪
成分を増幅し、この増幅された相互変調歪成分を、前記
電力増幅器の前段に帰還し、前記主信号と結合させる構
成である。In the distortion compensator of the present invention, a high frequency input signal is first divided into a main signal and an auxiliary signal, and the main signal is amplified by a power amplifier. The main signal amplified by this power amplifier and a part of the intermodulation distortion component generated by the main amplifier are taken out, and the taken out signal and the distributed auxiliary signal are combined in anti-phase and generated by the power amplifier. Then, the intermodulation distortion component is extracted. Next, the intermodulation distortion component is amplified, and the amplified intermodulation distortion component is fed back to the preceding stage of the power amplifier to be coupled with the main signal.
【０００８】[0008]
【作用】本発明によれば、電力増幅器の出力信号から相
互変調歪成分だけを取り出し、この相互変調歪成分だけ
で負帰還をかけている。したがって、歪補償量を大きく
しても、全体の利得が減少しない歪補償器を提供でき
る。According to the present invention, only the intermodulation distortion component is extracted from the output signal of the power amplifier, and the negative feedback is applied only by this intermodulation distortion component. Therefore, it is possible to provide a distortion compensator in which the overall gain does not decrease even if the distortion compensation amount is increased.
【０００９】[0009]
【実施例】以下、本発明の一実施例を、図１を参照して
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
【００１０】入力端子ＩＮから高周波信号が入力され
る。この高周波入力信号は、第一の方向性結合器１１で
主信号と補助信号とに分配される。分配された主信号
は、主増幅器である電力増幅器１２で増幅される。一
方、前記第一の方向性結合器１１で分配された補助信号
は帰還ループＬに加えられる。A high frequency signal is input from the input terminal IN. This high frequency input signal is split into a main signal and an auxiliary signal by the first directional coupler 11. The distributed main signal is amplified by the power amplifier 12, which is the main amplifier. On the other hand, the auxiliary signal distributed by the first directional coupler 11 is added to the feedback loop L.
【００１１】また、前記増幅器１２で増幅された主信号
には、増幅時に発生した相互変調歪成分が含まれる。相
互変調歪成分を含んだ主信号は、第二の方向性結合器１
３で、その一部が取り出され、第三の方向性結合器１４
に供給される。第三の方向性結合器１４には、前記第一
の方向性結合器１１で分配された補助信号も供給されて
おり、この方向性結合器１４において、第二の方向性結
合器１３から取り出された相互変調歪成分を含んだ主信
号と、前記第一の方向性結合器１１で分配された補助信
号とが逆相で結合する。The main signal amplified by the amplifier 12 contains an intermodulation distortion component generated during amplification. The main signal containing the intermodulation distortion component is the second directional coupler 1
At 3, a part of the third directional coupler 14 is taken out.
Is supplied to. The auxiliary signal distributed by the first directional coupler 11 is also supplied to the third directional coupler 14, and in this directional coupler 14, it is extracted from the second directional coupler 13. The main signal including the generated intermodulation distortion component and the auxiliary signal distributed by the first directional coupler 11 are coupled in antiphase.
【００１２】この結果、第三の方向性結合器１４から
は、電力増幅器１２で発生した相互変調歪成分のみが取
り出される。この第三の方向性結合器１４で取り出され
た相互変調歪成分は補助増幅器１５で増幅される。この
補助増幅器１５で増幅された相互変調歪成分は、発振防
止用の帯域通過フィルタ１６を通って、前記第一の方向
性結合器１１と前記電力増幅器１２との間に位置する第
四の方向性結合器１７に加えられる。第四の方向性結合
器１７では、帯域通過フィルタ１６を通った相互変調歪
成分が、第一の方向性結合器１１で分配された主信号と
結合され、電力増幅器１２で発生する相互変調歪成分を
補償するように作用する。As a result, only the intermodulation distortion component generated in the power amplifier 12 is extracted from the third directional coupler 14. The intermodulation distortion component extracted by the third directional coupler 14 is amplified by the auxiliary amplifier 15. The intermodulation distortion component amplified by the auxiliary amplifier 15 passes through a bandpass filter 16 for preventing oscillation and passes through a fourth direction located between the first directional coupler 11 and the power amplifier 12. It is added to the sex coupler 17. In the fourth directional coupler 17, the intermodulation distortion component that has passed through the bandpass filter 16 is combined with the main signal distributed by the first directional coupler 11, and the intermodulation distortion generated in the power amplifier 12 is generated. It acts to compensate the component.
【００１３】そして、相互変調歪成分が補償された電力
増幅器１２の出力は、第二の方向性結合器１３を経て、
出力端子ＯＵＴから出力される。The output of the power amplifier 12 in which the intermodulation distortion component has been compensated passes through the second directional coupler 13 and
It is output from the output terminal OUT.
【００１４】なお、上記の実施例では、帯域通過フィル
タ１６を補助増幅器１５の後段に設けているが、補助増
幅器１５の前段に設けてもよい。また、条件によって
は、帯域通過フィルタ１６を省略することもできる。In the above embodiment, the bandpass filter 16 is provided after the auxiliary amplifier 15, but it may be provided before the auxiliary amplifier 15. Further, depending on the conditions, the bandpass filter 16 may be omitted.
【００１５】[0015]
【発明の効果】本発明によれば、主信号は、負帰還がか
からないため、全体の利得は、歪補償量の大小にかかわ
らず、主増幅器の利得から主増幅器の前後の方向性結合
器などの損失分を引いただけの、ほぼ主増幅器の利得に
等しくすることができる。According to the present invention, since the main signal is not subjected to negative feedback, the overall gain is the gain of the main amplifier from the gain of the main amplifier to the directional couplers before and after the main amplifier, regardless of the amount of distortion compensation. It can be made almost equal to the gain of the main amplifier by subtracting the loss of.
【００１６】さらに、歪補償量は、相互変調歪成分を増
幅する補助増幅器の利得で制御することができる。Further, the amount of distortion compensation can be controlled by the gain of the auxiliary amplifier that amplifies the intermodulation distortion component.
【００１７】また、この補助増幅器は主信号よりもレベ
ルの小さい相互変調歪成分だけを増幅するため、従来と
同じ出力レベル・利得・歪補償量を得るために必要とな
る高周波電力増幅器の前段に比べ、消費電力はずっと小
さくて済み、全体の消費電力を低減できる。Further, since this auxiliary amplifier amplifies only the intermodulation distortion component whose level is lower than that of the main signal, it is provided before the high-frequency power amplifier required to obtain the same output level, gain, and distortion compensation amount as in the conventional case. In comparison, the power consumption is much smaller, and the overall power consumption can be reduced.
【図１】本発明の一実施例を示す回路構成図である。FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.
【図２】従来の一例を示す回路構成図である。FIG. 2 is a circuit configuration diagram showing a conventional example.
１１、１３、１４、１７…方向性結合器 １２、１５…増幅器 １６…帯域通過フィルタ Ｌ…帰還ループ 11, 13, 14, 17 ... Directional coupler 12, 15 ... Amplifier 16 ... Bandpass filter L ... Feedback loop
Claims (2)
分配する第一の方向性結合器と、前記主信号を増幅する
主増幅器と、この主増幅器で増幅された主信号および前
記主増幅器で発生した相互変調歪成分の一部を取り出す
第二の方向性結合器と、この第二の方向性結合器で取り
出された信号と前記第一の方向性結合器で分配された補
助信号とが逆相で結合し、主増幅器で発生した相互変調
歪成分が取り出される第三の方向性結合器と、この第三
の方向性結合器で取り出された相互変調歪成分を増幅す
る補助増幅器と、この補助増幅器で増幅された相互変調
歪成分と前記第一の方向性結合器で分配された主信号と
を、前記主増幅器の前段で結合させる第四の方向性結合
器とを具備した歪補償器。1. A first directional coupler for distributing a high-frequency input signal into a main signal and an auxiliary signal, a main amplifier for amplifying the main signal, a main signal amplified by the main amplifier, and the main amplifier. A second directional coupler for extracting a part of the intermodulation distortion component generated in, a signal extracted by the second directional coupler, and an auxiliary signal distributed by the first directional coupler. Are coupled in opposite phase, and the third directional coupler from which the intermodulation distortion component generated in the main amplifier is extracted, and the auxiliary amplifier that amplifies the intermodulation distortion component extracted from this third directional coupler , A distortion provided with a fourth directional coupler that combines the intermodulation distortion component amplified by the auxiliary amplifier and the main signal distributed by the first directional coupler in a stage preceding the main amplifier. Compensator.
向性結合器との間で、相互変調歪成分が伝送するループ
に帯域通過フィルタを設けた請求項１記載の歪補償器。2. The distortion compensator according to claim 1, wherein a bandpass filter is provided in a loop for transmitting an intermodulation distortion component between the third directional coupler and the fourth directional coupler. ..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32933891A JPH05167356A (en) | 1991-12-13 | 1991-12-13 | Distortion compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32933891A JPH05167356A (en) | 1991-12-13 | 1991-12-13 | Distortion compensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05167356A true JPH05167356A (en) | 1993-07-02 |
Family
ID=18220339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32933891A Pending JPH05167356A (en) | 1991-12-13 | 1991-12-13 | Distortion compensator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05167356A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486734B2 (en) | 2000-06-14 | 2002-11-26 | Fujitsu Limited | Amplifier apparatus |
| KR100458998B1 (en) * | 1995-12-29 | 2005-02-28 | 퀄컴 인코포레이티드 | Out-of-band compensation for non-linear device |
| JP2011097186A (en) * | 2009-10-27 | 2011-05-12 | Panasonic Corp | Device and method for compensating negative feedback type distortion |
-
1991
- 1991-12-13 JP JP32933891A patent/JPH05167356A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100458998B1 (en) * | 1995-12-29 | 2005-02-28 | 퀄컴 인코포레이티드 | Out-of-band compensation for non-linear device |
| US6486734B2 (en) | 2000-06-14 | 2002-11-26 | Fujitsu Limited | Amplifier apparatus |
| EP1164693A3 (en) * | 2000-06-14 | 2007-05-02 | Fujitsu Limited | Amplifier apparatus |
| JP2011097186A (en) * | 2009-10-27 | 2011-05-12 | Panasonic Corp | Device and method for compensating negative feedback type distortion |
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