JP3019569B2 - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- JP3019569B2 JP3019569B2 JP3360346A JP36034691A JP3019569B2 JP 3019569 B2 JP3019569 B2 JP 3019569B2 JP 3360346 A JP3360346 A JP 3360346A JP 36034691 A JP36034691 A JP 36034691A JP 3019569 B2 JP3019569 B2 JP 3019569B2
- Authority
- JP
- Japan
- Prior art keywords
- gain control
- voltage
- variable
- phase
- 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.)
- Expired - Lifetime
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は受信信号の位相情報を利
用する受信機の自動利得制御回路に関し、特に位相変動
を防止した自動利得制御回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic gain control circuit for a receiver using phase information of a received signal, and more particularly to an automatic gain control circuit for preventing phase fluctuation.
【０００２】[0002]
【従来の技術】従来の自動利得制御回路は、受信系に可
変利得増幅器を介挿するとともに、受信入力信号の強度
に応じてその可変利得増幅器の利得を制御することで自
動利得制御を行っている。2. Description of the Related Art A conventional automatic gain control circuit performs automatic gain control by interposing a variable gain amplifier in a receiving system and controlling the gain of the variable gain amplifier according to the strength of a received input signal. I have.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
この種の自動利得制御回路では、回路内の位相特性に変
動を生じ易く、入力信号の強弱に伴う利得制御電圧の変
化によって自動利得制御回路の入力端の位相差、即ち位
相回転量を一定に保持することが困難であった。このた
め、自動利得制御回路内の絶対位相差変動を問題とする
ような受信機、例えばアンテナの自動追尾用の角度誤差
信号の検出を行う追尾受信機、又は地球局から衛星に正
確な搬送波位相を伝達するPhase Transfer Link システ
ムの受信機等においては、この絶対位相差変動によって
高精度な検出や伝達が不可能になるという問題がある。
本発明の目的は、位相変動が生じない自動利得制御回路
を提供することにある。However, in such a conventional automatic gain control circuit, the phase characteristics in the circuit tend to fluctuate, and the change in the gain control voltage due to the strength of the input signal causes the automatic gain control circuit to fail. It has been difficult to keep the phase difference at the input end, that is, the phase rotation amount constant. For this reason, a receiver that is concerned with the absolute phase difference fluctuation in the automatic gain control circuit, for example, a tracking receiver that detects an angle error signal for automatic tracking of an antenna, or an accurate carrier wave phase from the earth station to the satellite In a receiver of a Phase Transfer Link system for transmitting the signal, there is a problem that the detection and transmission with high accuracy are impossible due to the absolute phase difference fluctuation.
SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic gain control circuit that does not cause phase fluctuation.
【０００４】[0004]
【課題を解決するための手段】本発明は、受信信号レベ
ルに応じて可変利得増幅器の利得を制御して利得を自動
制御する回路に、可変利得増幅器の出力信号の位相回転
を補償するための可変移相器と、可変利得増幅器の利得
を制御するための利得制御電圧をＡ／Ｄ変換するＡ／Ｄ
変換器と、このＡ／Ｄ変換器の出力に応じて予め書き込
んであるデータを読み出し、このデータに基づいて前記
可変移相器の移相量を制御する記憶手段とを備える。SUMMARY OF THE INVENTION The present invention provides a circuit for controlling the gain of a variable gain amplifier in accordance with the level of a received signal and automatically controlling the gain to compensate for the phase rotation of the output signal of the variable gain amplifier. Variable phase shifter and A / D for A / D converting a gain control voltage for controlling the gain of variable gain amplifier
A conversion unit; and a storage unit that reads out data that has been written in advance according to the output of the A / D converter, and controls a phase shift amount of the variable phase shifter based on the data.
【０００５】[0005]
【作用】本発明は、利得制御電圧に対応した移相量を記
憶手段から読み出し、この読み出したデータに基づいて
可変利得増幅器から出力される信号の移相量を制御する
ことで、移相変動を解消する。According to the present invention, the phase shift amount corresponding to the gain control voltage is read from the storage means, and the phase shift amount of the signal output from the variable gain amplifier is controlled based on the read data, whereby the phase shift fluctuation is obtained. To eliminate.
【０００６】[0006]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の一実施例のブロック図である。同図
において、１は受信機の入力信号レベルに応じてその利
得が可変制御される可変利得増幅器、２は可変利得増幅
器１がその利得を変化させた際に生じる位相の変動を補
償する可変移相器、３は可変利得増幅器１から出力され
る出力信号レベルを検出する振幅検波器、４は振幅検波
器３の出力電圧の中に含まれている高周波成分を除去す
る低域ろ波器である。又、５は振幅検波器３と低域ろ波
器４によって検出された直流電圧と、基準電圧発生源６
の電圧ＥS の比較を行い、その差の電圧を増幅する直流
増幅器であり、この直流増幅器５の出力電圧は利得制御
電圧として可変利得増幅器に供給され、負帰還ループと
しての自動利得制御回路を構成している。Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a variable gain amplifier whose gain is variably controlled in accordance with the input signal level of a receiver, and 2 denotes a variable gain amplifier for compensating a phase change caused when the variable gain amplifier 1 changes its gain. A phase detector 3 is an amplitude detector for detecting the output signal level output from the variable gain amplifier 1, and 4 is a low-pass filter for removing high-frequency components contained in the output voltage of the amplitude detector 3. is there. Reference numeral 5 denotes a DC voltage detected by the amplitude detector 3 and the low-pass filter 4, and a reference voltage source 6
Is a DC amplifier that compares the voltage E S of the DC amplifier 5 and amplifies the difference voltage. Make up.
【０００７】更に、前記直流増幅器５の出力をＡ／Ｄ変
換するＡ／Ｄ変換器７と、異なるアドレスに対して夫々
位相回転量を設定したＲＯＭ（リードオンリーメモリ）
８を接続し、このＲＯＭ８の出力で前記可変移相器２を
制御するように構成している。Further, an A / D converter 7 for A / D converting the output of the DC amplifier 5 and a ROM (read only memory) in which the phase rotation amount is set for different addresses, respectively.
The variable phase shifter 2 is controlled by the output of the ROM 8.
【０００８】このような負帰還ループにおいて、直流増
幅器５の直流利得を十分大きく定めておくことにより、
直流増幅器５の入力電圧は、基準電圧発生源６の電圧で
あるＥS に等しくなるように可変利得増幅器１の利得制
御が自動的に行われる。この結果、自動利得制御回路の
出力信号である可変利得増幅器１及び可変移相器２の出
力信号レベルは、基準電圧ＥS によって定まる一定の出
力信号レベルに自動利得制御が行われることになる。In such a negative feedback loop, by setting the DC gain of the DC amplifier 5 sufficiently large,
Input voltage of the DC amplifier 5, the gain control of the variable gain amplifier 1 is automatically carried out to be equal to E S is the voltage of the reference voltage generating source 6. As a result, the variable gain amplifier 1 and the output signal level of the variable phase shifter 2 which is an output signal of the automatic gain control circuit, the automatic gain control is performed in the constant output signal level determined by the reference voltage E S.
【０００９】又、直流増幅器５の出力電圧である利得制
御電圧はＡ／Ｄ変換器７においてＡ／Ｄ変換され、Ａ／
Ｄ変換後のデータはＲＯＭ８のアドレスポートに供給さ
れる。ＲＯＭ８は、入力データであるＡ／Ｄ変換された
利得制御電圧から可変移相器２の制御に必要なデータを
出力し、可変移相器２に供給して移相量を制御する。The gain control voltage, which is the output voltage of the DC amplifier 5, is A / D converted by the A / D converter 7, and
The data after the D conversion is supplied to the address port of the ROM 8. The ROM 8 outputs data necessary for controlling the variable phase shifter 2 from the A / D converted gain control voltage, which is input data, and supplies the data to the variable phase shifter 2 to control the amount of phase shift.
【００１０】前記ＲＯＭ８には、図２に示すように、利
得制御電圧と可変移相器の位相回転量の関係を満たす変
換が行われるような変換テーブルが予め書き込んであ
る。即ち、図２は可変利得増幅器１の利得制御電圧に対
する位相回転量を９とし、この位相回転の変動を補償す
るための可変移相器の利得制御電圧に対する位相回転量
を１０として示している。したがって、この位相回転量
１０をＲＯＭ８から読み出し、その読み出しデータに基
づいて可変移相器２の移相量を制御し、その移相量を可
変利得増幅器１の位相に加算することによって、出力信
号の位相は利得制御電圧によらず一定とすることができ
る。As shown in FIG. 2, a conversion table for performing conversion satisfying the relationship between the gain control voltage and the amount of phase rotation of the variable phase shifter is written in the ROM 8 in advance. That is, FIG. 2 shows that the amount of phase rotation of the variable gain amplifier 1 with respect to the gain control voltage is 9, and the amount of phase rotation of the variable phase shifter for compensating the fluctuation of the phase rotation is 10 with respect to the gain control voltage. Therefore, the phase rotation amount 10 is read from the ROM 8, the phase shift amount of the variable phase shifter 2 is controlled based on the read data, and the phase shift amount is added to the phase of the variable gain amplifier 1 to obtain the output signal. Can be constant regardless of the gain control voltage.
【００１１】[0011]
【発明の効果】以上説明したように本発明は、自動利得
制御を行うための利得制御電圧に応じて読み出される移
相量に基づいて出力の移相量を制御するため、可変利得
制御に際して生じる位相の変動を補償することができ、
利得制御によっても位相の変動が生ずることがない自動
利得制御回路を構成できる効果がある。As described above, according to the present invention, the output phase shift amount is controlled based on the phase shift amount read out in accordance with the gain control voltage for performing the automatic gain control. Phase fluctuations can be compensated,
There is an effect that an automatic gain control circuit in which the phase does not fluctuate even by the gain control can be configured.
【図１】本発明の自動利得制御回路の一実施例のブロッ
ク図である。FIG. 1 is a block diagram of an embodiment of an automatic gain control circuit according to the present invention.
【図２】入力信号レベルと位相回転量（位相差）との相
関を示す図である。FIG. 2 is a diagram illustrating a correlation between an input signal level and a phase rotation amount (phase difference).
１ 可変利得増幅器 ２ 可変移相器 ３ 振幅検波器 ４ 低域ろ波器 ５ 直流増幅器 ６ 基準電圧発生源 ７ Ａ／Ｄ変換器 ８ ＲＯＭ DESCRIPTION OF SYMBOLS 1 Variable gain amplifier 2 Variable phase shifter 3 Amplitude detector 4 Low-pass filter 5 DC amplifier 6 Reference voltage generator 7 A / D converter 8 ROM
Claims (1)
と、この可変利得増幅器の出力振幅を検出する振幅検波
器と、出力振幅から直流電圧のみを抽出する低域ろ波器
と、抽出された直流電圧と基準電圧との電圧差を求めて
前記可変利得増幅器の利得制御電圧を出力する直流増幅
器と、前記可変利得増幅器の出力信号の位相回転を補償
するための可変移相器と、前記直流増幅器の出力電圧を
Ａ／Ｄ変換するＡ／Ｄ変換器と、このＡ／Ｄ変換器の出
力に基づいて予め書き込んであるデータを読み出し、こ
の読み出したデータに基づいて前記可変移相器の移相量
を制御する記憶手段とを備えることを特徴とする自動利
得制御回路。A variable gain amplifier for amplifying a received signal; an amplitude detector for detecting an output amplitude of the variable gain amplifier; a low-pass filter for extracting only a DC voltage from the output amplitude; A DC amplifier for obtaining a voltage difference between a DC voltage and a reference voltage and outputting a gain control voltage of the variable gain amplifier; a variable phase shifter for compensating a phase rotation of an output signal of the variable gain amplifier; An A / D converter for A / D converting the output voltage of the amplifier; reading data written in advance based on the output of the A / D converter; shifting the variable phase shifter based on the read data; An automatic gain control circuit, comprising: storage means for controlling a phase amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3360346A JP3019569B2 (en) | 1991-12-30 | 1991-12-30 | Automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3360346A JP3019569B2 (en) | 1991-12-30 | 1991-12-30 | Automatic gain control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05183359A JPH05183359A (en) | 1993-07-23 |
| JP3019569B2 true JP3019569B2 (en) | 2000-03-13 |
Family
ID=18469007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3360346A Expired - Lifetime JP3019569B2 (en) | 1991-12-30 | 1991-12-30 | Automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3019569B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3214463B2 (en) * | 1998-10-21 | 2001-10-02 | 日本電気株式会社 | Wireless communication device |
| JP3709316B2 (en) | 1999-05-28 | 2005-10-26 | 松下電器産業株式会社 | Communication apparatus and communication method |
| US20060183451A1 (en) * | 2003-06-06 | 2006-08-17 | Interdigital Technology Corporation | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments |
| JP2006086894A (en) * | 2004-09-16 | 2006-03-30 | Matsushita Electric Ind Co Ltd | Radio transmitting circuit, radio receiving circuit and radio equipment of array antenna system |
-
1991
- 1991-12-30 JP JP3360346A patent/JP3019569B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05183359A (en) | 1993-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5266906A (en) | Linear amplifier performing distortion compensation control | |
| US7408489B2 (en) | Method and system for mixed analog-digital automatic gain control | |
| US4968968A (en) | Transmitter phase and amplitude correction for linear FM systems | |
| US5355101A (en) | Quadrature modulator having circuit for correcting phase error | |
| US5408197A (en) | Automatic power control circuit for controlling transmitting power of modulated radio frequency signal | |
| US5422601A (en) | Hybrid analog digital automatic gain control gain recovery system | |
| US4752941A (en) | Diversity receiving system of in-phase combination type | |
| EP1193865B1 (en) | Distortion compensation apparatus and distortion compensation method | |
| US5172071A (en) | Linearized output control of a nonlinear amplifier | |
| JP3019569B2 (en) | Automatic gain control circuit | |
| US7486131B2 (en) | Quadrature demodulator and interrogator | |
| GB2264829A (en) | Rf receiver agc incorporating time domain equalizer circuitry | |
| US20050073450A1 (en) | Temperature compensation device for automatic gain control loop | |
| US6370210B1 (en) | Circuitry for generating a gain control signal applied to an AGC amplifier and method thereof | |
| JPS6025310A (en) | Fet linear power amplifier for ssb multiplex radio equipment | |
| US7027791B2 (en) | Analog baseband signal processing system and method | |
| JP2684848B2 (en) | Transmission power control method | |
| JPH04291829A (en) | Distortion compensation circuit | |
| JPH11168335A (en) | Receiver with gain control function | |
| US6269134B1 (en) | Data transmission method and apparatus in pulse amplitude modulation communication system | |
| US5982310A (en) | Digital signal processing apparatus | |
| US7120848B2 (en) | Apparatus and method for forward error correction | |
| JPH05175771A (en) | Linear amplifier | |
| KR100469239B1 (en) | Method for auto gain compensation to Digital TV modulator | |
| JPH1022757A (en) | Automatic transmission power control circuit |