JPH06188753A - Linearity compensation system - Google Patents
Linearity compensation systemInfo
- Publication number
- JPH06188753A JPH06188753A JP35637892A JP35637892A JPH06188753A JP H06188753 A JPH06188753 A JP H06188753A JP 35637892 A JP35637892 A JP 35637892A JP 35637892 A JP35637892 A JP 35637892A JP H06188753 A JPH06188753 A JP H06188753A
- Authority
- JP
- Japan
- Prior art keywords
- envelope
- circuit
- intermediate frequency
- modulated carrier
- input terminal
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はデジタル変調方式無線機
の直線性補償に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to linearity compensation for digital modulation type radios.
【０００２】[0002]
【従来の技術】図２は従来の直線性補償方式の一例で，
入力端子１から入力した被変調搬送波は，ミクサ３で局
発回路４からの局発信号と混合され，高周波に変換され
る。高周波に変換された被変調搬送波は帯域通過フィル
タ（Ｂ．Ｐ．Ｆ）５を経由して，ＡＧＣ回路１２に与え
られたのち，電力増幅器６で電力増幅され，結合回路７
を経て出力端子８に出力される。2. Description of the Related Art FIG. 2 shows an example of a conventional linearity compensation method.
The modulated carrier wave input from the input terminal 1 is mixed with the local oscillator signal from the local oscillator circuit 4 by the mixer 3 and converted into a high frequency. The modulated carrier that has been converted to a high frequency is supplied to the AGC circuit 12 via the band pass filter (BPF) 5 and then power-amplified by the power amplifier 6 to be combined with the coupling circuit 7.
Is output to the output terminal 8.
【０００３】ここで，前記結合回路７の出力の一部は，
包絡線検波回路９で包絡線検波され，その出力は差動増
幅器１０の一方の入力端子に与えられる。また，前記
Ｂ．Ｐ．Ｆ５の出力の一部は包絡線検波回路１１で包絡
線検波され，その出力は差動増幅器１０の他方の入力端
子に与えられる。差動増幅器１０は，前記２つの信号を
比較し，その差成分で前記ＡＧＣ回路１２の利得を制御
するように動作する。したがって，電力増幅器６で発生
する非直線性歪みを改善することができる。Here, a part of the output of the coupling circuit 7 is
Envelope detection is performed by the envelope detection circuit 9, and its output is given to one input terminal of the differential amplifier 10. Further, the B. P. A part of the output of F5 is subjected to envelope detection by the envelope detection circuit 11, and its output is given to the other input terminal of the differential amplifier 10. The differential amplifier 10 compares the two signals and operates to control the gain of the AGC circuit 12 by the difference component. Therefore, the nonlinear distortion generated in the power amplifier 6 can be improved.
【０００４】[0004]
【発明が解決しようとする課題】前述の従来技術では，
比較の基準となる信号として，高周波に変換された被変
調搬送波を用いていたため，通信周波数帯が広帯域であ
る場合には，包絡線検波回路１１と，ＡＧＣ回路１２の
帯域特性によって出力信号の帯域特性が影響を受けると
いう欠点があった。本発明はこのような欠点を除去し，
広帯域にわたって直線性補償を行うことを目的とする。In the above-mentioned prior art,
Since the modulated carrier that has been converted to a high frequency is used as the reference signal for comparison, if the communication frequency band is a wide band, the band characteristic of the envelope detection circuit 11 and the AGC circuit 12 causes the band of the output signal to change. There was a drawback that the characteristics were affected. The present invention eliminates such drawbacks,
The purpose is to perform linearity compensation over a wide band.
【０００５】[0005]
【課題を解決するための手段】本発明は上記の目的を達
成するため，比較の基準となる信号として，中間周波の
被変調搬送波を包絡線検波した信号を用い，かつＡＧＣ
回路も中間周波段に設けたものである。In order to achieve the above object, the present invention uses, as a reference signal for comparison, a signal obtained by performing envelope detection on a modulated carrier wave of an intermediate frequency and using AGC.
The circuit is also provided in the intermediate frequency stage.
【０００６】[0006]
【作用】その結果，基準側の包絡線検波回路と，ＡＧＣ
回路は中間周波数で動作するので，チャネル周波数によ
らず常に一定の動作条件となる。As a result, the envelope detection circuit on the reference side and the AGC
Since the circuit operates at the intermediate frequency, the operating conditions are always constant regardless of the channel frequency.
【０００７】[0007]
【実施例】以下この発明の一実施例を図１により説明す
る。入力端子１から入力された中間周波の被変調搬送波
は，ＡＧＣ回路２を経由してミクサ３に与えられ，局発
回路４からの局発信号と混合されて，高周波に変換され
たのち，Ｂ．Ｐ．Ｆ５を経て電力増幅器６で電力増幅さ
れ，結合回路７を経由して出力端子８に出力される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The modulated carrier wave of the intermediate frequency input from the input terminal 1 is given to the mixer 3 via the AGC circuit 2, mixed with the local oscillation signal from the local oscillation circuit 4 and converted to a high frequency, and then B ． P. The power is amplified by the power amplifier 6 through F5 and output to the output terminal 8 via the coupling circuit 7.
【０００８】結合回路７の出力の一部は包絡線検波回路
９で包絡線検波され，差動増幅器１０の一方の入力端子
に与えられる。また，前記中間周波の被変調搬送波の一
部は，包絡線検波回路１１で包絡線検波され，前記差動
増幅器１０の他方の入力端子に与えられる。差動増幅器
１０は，前記２つの信号を比較し，その差の成分で前記
ＡＧＣ回路２の利得を制御するように動作する。したが
って電力増幅器６で発生する非直線性歪みを改善するこ
とができる。A part of the output of the coupling circuit 7 is subjected to envelope detection by the envelope detection circuit 9 and given to one input terminal of the differential amplifier 10. Further, a part of the modulated carrier wave of the intermediate frequency is subjected to envelope detection by the envelope detection circuit 11 and given to the other input terminal of the differential amplifier 10. The differential amplifier 10 operates to compare the two signals and control the gain of the AGC circuit 2 by the difference component. Therefore, the nonlinear distortion generated in the power amplifier 6 can be improved.
【０００９】また，前記局発回路４の局発周波数が変わ
っても，基準となる包絡線検波信号は，一定の中間周波
数で検波され，かつＡＧＣ回路２も中間周波数で動作す
るので，帯域特性の影響を受けることなく，安定な直線
性補償を得ることができる。Further, even if the local oscillator frequency of the local oscillator circuit 4 changes, the reference envelope detection signal is detected at a constant intermediate frequency, and the AGC circuit 2 also operates at the intermediate frequency, so the band characteristic It is possible to obtain stable linearity compensation without being affected by.
【００１０】本発明の他の実施例を図３により説明す
る。入力端子１から入力された中間周波の被変調搬送波
は，ミクサ３で局発回路４からの局発信号と混合され，
高周波に変換される。高周波に変換された被変調搬送波
は帯域通過フィルタ（Ｂ．Ｐ．Ｆ）４を経由して，ＡＧ
Ｃ回路２に与えられたのち，電力増幅器６で電力増幅さ
れ，結合回路７を経て出力端子８に出力される。ここ
で，前記結合回路７の出力の一部は，包絡線検波回路９
で包絡線検波され，その出力は差動増幅器１０の一方の
入力端子に与えられる。また，前記入力端子１から入力
された中間周波の被変調搬送波の一部は，包絡線検波回
路１１で包絡線検波され，その出力は差動増幅器１０の
他方の入力端子に与えられる。差動増幅器１０は前記２
つの信号を比較し，その差成分で前記ＡＧＣ回路２の利
得を制御するように動作する。したがって，電力増幅器
６で発生する非直線歪みを改善することができる。Another embodiment of the present invention will be described with reference to FIG. The intermediate frequency modulated carrier wave input from the input terminal 1 is mixed with the local oscillator signal from the local oscillator circuit 4 by the mixer 3,
Converted to high frequency. The modulated carrier converted into high frequency passes through a band pass filter (BPF) 4 and
After being supplied to the C circuit 2, the power is amplified by the power amplifier 6 and output to the output terminal 8 via the coupling circuit 7. Here, a part of the output of the coupling circuit 7 is the envelope detection circuit 9
Envelope detection is performed by and the output is given to one input terminal of the differential amplifier 10. Further, a part of the intermediate frequency modulated carrier wave inputted from the input terminal 1 is subjected to envelope detection by the envelope detection circuit 11, and its output is given to the other input terminal of the differential amplifier 10. The differential amplifier 10 has the above-mentioned 2
The two signals are compared with each other, and the difference component operates to control the gain of the AGC circuit 2. Therefore, the non-linear distortion generated in the power amplifier 6 can be improved.
【００１１】[0011]
【発明の効果】本発明によれば広帯域にわたって，直線
性補償を行うことができる。According to the present invention, linearity compensation can be performed over a wide band.
【図１】本発明の一実施例を示すブロック図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】従来の実施例を示すブロック図。FIG. 2 is a block diagram showing a conventional embodiment.
【図３】本発明の他の実施例を示すブロック図。FIG. 3 is a block diagram showing another embodiment of the present invention.
１ 入力端子 ２ ＡＧＣ回路 ３ ミクサ ４ 局発回路 ５ ＢＰＦ ６ 電力増幅器 ７ 結合回路 ８ 出力端子 ９ 包絡線検波回路 １０ 差動増幅器 １１ 包絡線検波回路 １２ ＡＧＣ回路 1 Input Terminal 2 AGC Circuit 3 Mixer 4 Local Circuit 5 BPF 6 Power Amplifier 7 Coupling Circuit 8 Output Terminal 9 Envelope Detection Circuit 10 Differential Amplifier 11 Envelope Detection Circuit 12 AGC Circuit
Claims (2)
を，局発信号と混合して高周波に周波数変換したのち電
力増幅する無線機において，前記中間周波の被変調搬送
波を包絡線検波した信号と，電力増幅器の出力の一部を
とり出して，包絡線検波した信号との差の成分をとり出
し，その差成分の信号で，中間周波段の増幅器の利得を
制御することを特徴とする直線性補償方式。1. A signal obtained by envelope-detecting the modulated carrier of the intermediate frequency in a radio device which mixes a quadrature-modulated modulated carrier of the intermediate frequency with a local signal, frequency-converts it to a high frequency, and then amplifies power. And a part of the output of the power amplifier is taken out to take out the difference component from the signal subjected to the envelope detection, and the gain of the amplifier at the intermediate frequency stage is controlled by the signal of the difference component. Linearity compensation method.
を，局発信号と混合して高周波に周波数変換したのち電
力増幅する無線機において，前記中間周波の被変調搬送
波を包絡線検波した信号と，電力増幅器の出力の一部を
とりだして，包絡線検波した信号との差の成分を取り出
し，その差成分の信号で，高周波段の増幅器の利得を制
御することを特徴とする直線性補償方式。2. A signal obtained by envelope-detecting the modulated carrier of the intermediate frequency in a radio device which mixes a quadrature-modulated modulated carrier of the intermediate frequency with a local signal, frequency-converts it to a high frequency, and then amplifies power. And a part of the output of the power amplifier, the difference component from the envelope-detected signal is extracted, and the gain of the amplifier in the high frequency stage is controlled by the signal of the difference component. method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35637892A JPH06188753A (en) | 1992-12-21 | 1992-12-21 | Linearity compensation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35637892A JPH06188753A (en) | 1992-12-21 | 1992-12-21 | Linearity compensation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06188753A true JPH06188753A (en) | 1994-07-08 |
Family
ID=18448720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35637892A Pending JPH06188753A (en) | 1992-12-21 | 1992-12-21 | Linearity compensation system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06188753A (en) |
Cited By (1)
| 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 |
-
1992
- 1992-12-21 JP JP35637892A patent/JPH06188753A/en active Pending
Cited By (1)
| 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 |
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