JPS62136910A - Automatic gain adjusting circuit - Google Patents
Automatic gain adjusting circuitInfo
- Publication number
- JPS62136910A JPS62136910A JP27671685A JP27671685A JPS62136910A JP S62136910 A JPS62136910 A JP S62136910A JP 27671685 A JP27671685 A JP 27671685A JP 27671685 A JP27671685 A JP 27671685A JP S62136910 A JPS62136910 A JP S62136910A
- Authority
- JP
- Japan
- Prior art keywords
- pin diode
- circuit
- current
- agc
- automatic gain
- 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】
〔発明の利用分野〕
本発明は自動利得調整回路（ＡＧＣ）に係シ、特に歪特
性改善に適したＡＧＣ回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an automatic gain control circuit (AGC), and particularly to an AGC circuit suitable for improving distortion characteristics.
〔発明の背景） 第３図は従来のＡＧＣ回路の一例を示す回路図である。[Background of the invention] FIG. 3 is a circuit diagram showing an example of a conventional AGC circuit.
同図において、１はＤＣカット用コンデンサ、２は接地
用コンデンサ、３はバイアス供給用抵抗、４はＡＧＯ供
給用抵抗、５はバイポーラトランジスタ、である。In the figure, 1 is a DC cut capacitor, 2 is a grounding capacitor, 3 is a bias supply resistor, 4 is an AGO supply resistor, and 5 is a bipolar transistor.
第３図に見られる如く、従来のＡＧＣ回路は、ベース電
圧を制御することによう増幅利得を調整する方式がとら
れていたが、トランジスタによってバイアス電圧による
歪特性の最良点が異なり、ＡＧＣをかける事によシ歪特
性が劣化する場合が生じていた。As shown in Figure 3, conventional AGC circuits have adopted a method of adjusting the amplification gain by controlling the base voltage, but the best point of distortion characteristics due to bias voltage differs depending on the transistor, In some cases, the distortion characteristics deteriorated due to this.
なお、かかるＡＧＣ回路の従来例を記載した文献として
は、実開昭５６−２６４１８号公報（％に第１図）、実
公昭４４−１９３７７号公報等を挙げることができる。Documents describing conventional examples of such AGC circuits include Japanese Utility Model Application No. 56-26418 (Figure 1 in %), Japanese Utility Model Publication No. 19377-1980, and the like.
本発明の目的は歪特性を劣化させることなく、増幅利得
を調整することのできる自動利得調整回路を提供するこ
とにある。An object of the present invention is to provide an automatic gain adjustment circuit that can adjust amplification gain without deteriorating distortion characteristics.
〔発明の概要Ｊ
一般にトランジスタ増幅回路は、バイアス電圧を可変に
することによシ歪特性が変化する為、本発明においては
、バイアスを固定ＫＬ、増幅回路に帰還回路を設けて、
その帰還量を変える事によシ増幅度を制御する方式を採
用した。[Summary of the Invention J Generally, in a transistor amplifier circuit, the distortion characteristics change by making the bias voltage variable.
We adopted a method to control the amplification degree by changing the amount of feedback.
以下、本発明の一実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.
第１図は本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
同図において、６はビンダイオードである。第１図に示
した実施例は、トランジスタ５の増幅度をビンダイオー
ド６で構成された帰還回路で制御する方式をとっておシ
、ビンダイオード６にＡＧＣ端子より抵抗４を介して電
流が供給され、その電波量によって可変するビンダイオ
ード６の抵抗値で増幅度を制御するようにしている。In the figure, 6 is a bin diode. The embodiment shown in FIG. 1 uses a method in which the amplification degree of the transistor 5 is controlled by a feedback circuit composed of a bin diode 6, and a current is supplied to the bin diode 6 from the AGC terminal via the resistor 4. The degree of amplification is controlled by the resistance value of the bin diode 6, which varies depending on the amount of radio waves.
ビンダイオードは通常第２図に示す如き抵抗・電流特性
をしており、０〜１ｍＡ電流を流すことにより帰還量を
可変することができるようになっている。A bin diode usually has resistance/current characteristics as shown in FIG. 2, and the amount of feedback can be varied by passing a current of 0 to 1 mA.
〔発明の効果ｊ
本発明によれば、歪特性を劣化させることなくＡＧＣを
かけることが出来るので強電界入力又は広帯域増幅器と
して性能向上を図ることができる。[Effects of the Invention j] According to the present invention, since AGC can be applied without deteriorating the distortion characteristics, performance can be improved as a strong electric field input or broadband amplifier.
第１図は本発明の一実施例を示す回路図、第２図は第１
図におけるビンダイオードの電流・抵抗特性を示すグラ
フ、第３図けＡＧＣ回路の従来例を示す回路図、である
。
１・・・ＤＣカット用コンデンサ
２・・・接地用コンデンサ
３・・・バイアス供給用抵抗
４・・・ＡＧＣ供給用抵抗
５・・・バイポーラトランジスタ
６・・・ビンダイオードFig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
FIG. 3 is a graph showing the current/resistance characteristics of the Vin diode in the figure, and FIG. 3 is a circuit diagram showing a conventional example of an AGC circuit. 1...DC cut capacitor 2...Grounding capacitor 3...Bias supply resistor 4...AGC supply resistor 5...Bipolar transistor 6...Bin diode
Claims (1)
前記トランジスタの帰還回路を構成するピンダイオード
と、前記ピンダイオードへ自動利得制御端子から可変電
流を給供する手段と、を具備し、前記可変電流により前
記ピンダイオードによる帰還量を可変して増幅利得を制
御するようにしたことを特徴とする自動利得調整回路。1) In an amplifier circuit using a transistor as an amplifier element,
A pin diode constituting a feedback circuit of the transistor, and means for supplying a variable current to the pin diode from an automatic gain control terminal, the feedback amount of the pin diode being varied by the variable current to adjust the amplification gain. An automatic gain adjustment circuit characterized by controlling the gain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27671685A JPS62136910A (en) | 1985-12-11 | 1985-12-11 | Automatic gain adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27671685A JPS62136910A (en) | 1985-12-11 | 1985-12-11 | Automatic gain adjusting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62136910A true JPS62136910A (en) | 1987-06-19 |
Family
ID=17573332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27671685A Pending JPS62136910A (en) | 1985-12-11 | 1985-12-11 | Automatic gain adjusting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62136910A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355096A (en) * | 1993-07-06 | 1994-10-11 | Trw Inc. | Compace HBT wide band microwave variable gain active feedback amplifier |
| US5546050A (en) * | 1995-03-14 | 1996-08-13 | The Boeing Company | Radio frequency bus leveling system |
-
1985
- 1985-12-11 JP JP27671685A patent/JPS62136910A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355096A (en) * | 1993-07-06 | 1994-10-11 | Trw Inc. | Compace HBT wide band microwave variable gain active feedback amplifier |
| US5546050A (en) * | 1995-03-14 | 1996-08-13 | The Boeing Company | Radio frequency bus leveling system |
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