JPH0327607A - Gain control circuit - Google Patents
Gain control circuitInfo
- Publication number
- JPH0327607A JPH0327607A JP16170889A JP16170889A JPH0327607A JP H0327607 A JPH0327607 A JP H0327607A JP 16170889 A JP16170889 A JP 16170889A JP 16170889 A JP16170889 A JP 16170889A JP H0327607 A JPH0327607 A JP H0327607A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- gain control
- gain
- operational amplifier
- circuit
- 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
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は利得制御回路に関し、特にマイクロ波ヘテログ
イン中継機等で使用される中間周波増幅器の利得制御回
路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gain control circuit, and particularly to a gain control circuit for an intermediate frequency amplifier used in a microwave heterolog repeater or the like.
第２図にマイクロ波へテログイン中継機等で使用される
従来の利得制御回路を示す。図において、１１は複数段
に接続した中間周波増幅器、１２はこれら中間周波増幅
器１１の間に介挿した利得可変用ＰＩＮダイオード、１
３は利得制御用演算増幅器、Ｒは抵抗である．
この利得制御回路においては、利得制御電圧を利得制御
用演算増幅器１３を通してＰＩＮダイオードｌ３に印加
することにより、このＰＩＮダイオード１２における利
得を可変し、中間周波増幅器１１を通して出力される中
間周波数信号の利得を制御している．
〔発明が解決しようとする課題〕
上述した従来の利得制御回路においては、ＰＩＮダイオ
ード１２における電流とその高周波抵抗値の相関特性が
非直線性であるために、制？ｉｌｔ圧に対するＰＩＮダ
イオード１２の利得が直線的な関係とならず、利得制御
が困難になるという問題がある．
また、ＰＩＮダイオード１２に存在する温度特性により
、利得制御の温度変動が大きくなるという間一理が生じ
ている。FIG. 2 shows a conventional gain control circuit used in microwave totelogin repeaters and the like. In the figure, 11 is an intermediate frequency amplifier connected in multiple stages, 12 is a variable gain PIN diode inserted between these intermediate frequency amplifiers 11, and 1
3 is an operational amplifier for gain control, and R is a resistor. In this gain control circuit, by applying a gain control voltage to the PIN diode l3 through the gain control operational amplifier 13, the gain in the PIN diode 12 is varied, and the gain of the intermediate frequency signal output through the intermediate frequency amplifier 11 is changed. is controlled. [Problems to be Solved by the Invention] In the conventional gain control circuit described above, since the correlation characteristic between the current in the PIN diode 12 and its high frequency resistance value is non-linear, it is difficult to control the gain control circuit. There is a problem in that the gain of the PIN diode 12 does not have a linear relationship with respect to the ilt pressure, making gain control difficult. Furthermore, there is a theory that temperature fluctuations in gain control become large due to temperature characteristics existing in the PIN diode 12.
本発明は利得制御電圧対利得の関係を直線的にし、かつ
その温度変動を少なくした利得制御回路を提供すること
を目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a gain control circuit in which the relationship between gain control voltage and gain is linear and temperature fluctuations thereof are reduced.
本発明の利得制御回路は、利得制御用のダイオードに印
加する利得制御電圧の回路を演算増幅器で構成し、この
演算増幅器の帰還回路とリファレンス電圧回路のそれぞ
れに、前記ダイオードと同じ特性のダイオードを接続し
ている。In the gain control circuit of the present invention, a circuit for a gain control voltage applied to a diode for gain control is composed of an operational amplifier, and a feedback circuit and a reference voltage circuit of the operational amplifier each include a diode having the same characteristics as the diode. Connected.
この構成によれば、利得制御電圧の回路に接続したダイ
オードと、増幅器の利得を制御するダイオードの特性が
互いに逆方向に作用し、ダイオードの非線形性を解消し
て利得と電圧との関係及び温度との関係を直線的なもの
とする．
〔実施例〕
次に、本発明を図面を参照して説明する。According to this configuration, the characteristics of the diode connected to the gain control voltage circuit and the diode that controls the gain of the amplifier act in opposite directions to each other, eliminating the nonlinearity of the diode and adjusting the relationship between gain and voltage and temperature. Let the relationship be linear. [Example] Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の回路図である。図において
、１は多段に接続した中間周波増幅器、２はこの中間周
波増幅器１間に介挿して利得を可変ずるＰＩＮダイオー
ドである。また、３，４は前記ＰＩＮダイオードに利得
制御用の制御電圧を印加するための回路を構戒する演算
増幅器である。FIG. 1 is a circuit diagram of an embodiment of the present invention. In the figure, 1 is an intermediate frequency amplifier connected in multiple stages, and 2 is a PIN diode inserted between the intermediate frequency amplifiers 1 to vary the gain. Further, numerals 3 and 4 are operational amplifiers that serve as a circuit for applying a control voltage for gain control to the PIN diode.
ここで、この演算増幅器３．４は２段に構成しており、
一方の演算増幅器３には、その帰還回路にＰＩＮダイオ
ード５を接続している．また、他方の演算増幅器４のリ
ファレンス側にはＰＩＮダイオード６を接続している。Here, this operational amplifier 3.4 is configured in two stages,
One operational amplifier 3 has a PIN diode 5 connected to its feedback circuit. Further, a PIN diode 6 is connected to the reference side of the other operational amplifier 4.
なお、これらＰＩＮダイオード５．６は前記ＰＩＮダイ
オード２と同じ特性のものが用いられる。なお、Ｒは抵
抗である．
この構戒の利得制御回路によれば、演算増幅器３では、
その帰還回路にＰＩＮダイオード５を使用しているので
、その出力電圧は入力電圧に対して非直線となる。そし
て、この出力電圧を演算増幅器４を通して利得可変用Ｐ
ＩＮダイオード２に加えることにより、電圧一利得の特
性がＰＩＮダイオード５と２で相殺し、結果として演算
増幅器の入力電圧とＰＩＮダイオード２の利得の関係を
直線的にし、利得制御を容易にする。Note that these PIN diodes 5.6 have the same characteristics as the PIN diode 2 described above. Note that R is resistance. According to this structured gain control circuit, in the operational amplifier 3,
Since the PIN diode 5 is used in the feedback circuit, the output voltage is non-linear with respect to the input voltage. Then, this output voltage is passed through an operational amplifier 4 to a variable gain P.
By adding it to the IN diode 2, the voltage-gain characteristics are canceled out by the PIN diodes 5 and 2, and as a result, the relationship between the input voltage of the operational amplifier and the gain of the PIN diode 2 becomes linear, making gain control easier.
また、ＰＩＮダイオード６により演算増幅器４のリファ
レンス電圧に温度補償を施すことになり、ＰＩＮダイオ
ード２の順方向電圧の温度変化による制ｉｔ圧の変動を
低減し、温度変動を抑制することができる．
〔発明の効果〕
以上説明したように本発明は、利得制Ｗｊｔ圧の回路を
構或する演算増幅器の帰還回路とリファレンス電圧回路
のそれぞれに、利得制御用ダイオードと同じ特性のダイ
オードを接続しているので、両ダイオードが互いに逆方
向に作用し、各ダイオードの非線形性を解消して利得制
御電圧対利得の関係を直線的にすることができ、かつそ
の温度変動を少なくすることができる効果がある。In addition, temperature compensation is applied to the reference voltage of the operational amplifier 4 by the PIN diode 6, so that it is possible to reduce fluctuations in the IT pressure due to temperature changes in the forward voltage of the PIN diode 2, and to suppress temperature fluctuations. [Effects of the Invention] As explained above, the present invention connects diodes with the same characteristics as the gain control diode to each of the feedback circuit and reference voltage circuit of the operational amplifier that constitute the gain control Wjt voltage circuit. As a result, both diodes act in opposite directions, eliminating the nonlinearity of each diode, making the relationship between gain control voltage and gain linear, and reducing temperature fluctuations. be.
第１図は本発明の利得制御回路の一実施例の回路図、第
２図は従来の利得制御回路の回路図である。FIG. 1 is a circuit diagram of an embodiment of the gain control circuit of the present invention, and FIG. 2 is a circuit diagram of a conventional gain control circuit.
Claims (1)
ドに印加する電圧を制御して前記増幅器における利得制
御を行う回路において、前記利得制御用の電圧を発生す
る回路を演算増幅器で構成し、この演算増幅器の帰還回
路とリファレンス電圧回路のそれぞれに、前記ダイオー
ドと同じ特性のダイオードを接続したことを特徴とする
利得制御回路。1. In a circuit that inserts a diode in series with an amplifier and controls the voltage applied to the diode to control the gain of the amplifier, the circuit that generates the gain control voltage is configured with an operational amplifier, and the circuit that generates the gain control voltage is configured with an operational amplifier. A gain control circuit characterized in that diodes having the same characteristics as the diodes are connected to each of a feedback circuit and a reference voltage circuit of an amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16170889A JPH0327607A (en) | 1989-06-23 | 1989-06-23 | Gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16170889A JPH0327607A (en) | 1989-06-23 | 1989-06-23 | Gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0327607A true JPH0327607A (en) | 1991-02-06 |
Family
ID=15740370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16170889A Pending JPH0327607A (en) | 1989-06-23 | 1989-06-23 | Gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0327607A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100397332B1 (en) * | 2001-06-11 | 2003-09-13 | 엘지전자 주식회사 | A temperature compensation circuit of agc for movable handset |
-
1989
- 1989-06-23 JP JP16170889A patent/JPH0327607A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100397332B1 (en) * | 2001-06-11 | 2003-09-13 | 엘지전자 주식회사 | A temperature compensation circuit of agc for movable handset |
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