JPH01160716U - - Google Patents

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Publication number
JPH01160716U
JPH01160716U JP5605688U JP5605688U JPH01160716U JP H01160716 U JPH01160716 U JP H01160716U JP 5605688 U JP5605688 U JP 5605688U JP 5605688 U JP5605688 U JP 5605688U JP H01160716 U JPH01160716 U JP H01160716U
Authority
JP
Japan
Prior art keywords
transistor
circuit
current source
differential amplifier
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.)
Granted
Application number
JP5605688U
Other languages
Japanese (ja)
Other versions
JPH066607Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1988056056U priority Critical patent/JPH066607Y2/en
Publication of JPH01160716U publication Critical patent/JPH01160716U/ja
Application granted granted Critical
Publication of JPH066607Y2 publication Critical patent/JPH066607Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Amplification And Gain Control (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、本考案に係る可変利得制御回路の一
実施例を示す回路図、第２図は、本考案に係る可
変利得制御回路の他の実施例を示す回路図。第３
図は、従来の利得制御回路を示す回路図である。 Ａ１，Ａ２：差動増幅回路、ＩＮ：入力端子、
ＯＵＴ：出力端子、１乃至４，６乃至９：トラン
ジスタ、５，１０：電流源回路、１１：バイアス
電圧源、２０，２１：能動負荷回路。 FIG. 1 is a circuit diagram showing one embodiment of the variable gain control circuit according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment of the variable gain control circuit according to the present invention. Third
The figure is a circuit diagram showing a conventional gain control circuit. A 1 , A 2 : Differential amplifier circuit, IN: Input terminal,
OUT: output terminal, 1 to 4, 6 to 9: transistors, 5, 10: current source circuit, 11: bias voltage source, 20, 21: active load circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 第１の能動負荷回路を具えた第１と第２のトラ
ンジスタからなる差動対と第１の電流源回路とか
らなる第１の差動増幅回路と、第２の能動負荷回
路を具えた第３と第４のトランジスタからなる差
動対と第２の電流源回路とからなる第２の差動増
幅回路と、該第２と該第３のトランジスタのベー
スに接続されるバイアス電圧源からなり、該第１
のトランジスタのベース・コレクタと該第４のト
ランジスタのベースが接続された接続点に入力信
号が供給されており、該第１と該第２の電流源回
路の少なくとも一方の電流値を制御して利得を可
変することにより、該第２の差動増幅回路から出
力を得ることを特徴とする利得制御回路。 A first differential amplifier circuit includes a differential pair of first and second transistors each having a first active load circuit, and a first current source circuit; a second differential amplifier circuit consisting of a differential pair consisting of a third transistor and a fourth transistor, a second current source circuit, and a bias voltage source connected to the bases of the second and third transistors. , the first
An input signal is supplied to a connection point where the base-collector of the transistor and the base of the fourth transistor are connected, and the current value of at least one of the first and second current source circuits is controlled. A gain control circuit characterized in that an output is obtained from the second differential amplifier circuit by varying the gain.
JP1988056056U 1988-04-26 1988-04-26 Gain control circuit Expired - Lifetime JPH066607Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988056056U JPH066607Y2 (en) 1988-04-26 1988-04-26 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988056056U JPH066607Y2 (en) 1988-04-26 1988-04-26 Gain control circuit

Publications (2)

Publication Number Publication Date
JPH01160716U true JPH01160716U (en) 1989-11-08
JPH066607Y2 JPH066607Y2 (en) 1994-02-16

Family

ID=31281942

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988056056U Expired - Lifetime JPH066607Y2 (en) 1988-04-26 1988-04-26 Gain control circuit

Country Status (1)

Country Link
JP (1) JPH066607Y2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051309A (en) * 1983-08-31 1985-03-22 Toshiba Corp Gain control circuit
JPS6238012A (en) * 1985-08-12 1987-02-19 Toshiba Corp Variable gain circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051309A (en) * 1983-08-31 1985-03-22 Toshiba Corp Gain control circuit
JPS6238012A (en) * 1985-08-12 1987-02-19 Toshiba Corp Variable gain circuit

Also Published As

Publication number Publication date
JPH066607Y2 (en) 1994-02-16

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