JPS57196609A - Gain adjusting circuit - Google Patents

Gain adjusting circuit

Info

Publication number
JPS57196609A
JPS57196609A JP8227781A JP8227781A JPS57196609A JP S57196609 A JPS57196609 A JP S57196609A JP 8227781 A JP8227781 A JP 8227781A JP 8227781 A JP8227781 A JP 8227781A JP S57196609 A JPS57196609 A JP S57196609A
Authority
JP
Japan
Prior art keywords
collector
base
trs
power supply
voltage source
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
Application number
JP8227781A
Other languages
Japanese (ja)
Inventor
Masahiro Watanabe
Yoichi Morita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8227781A priority Critical patent/JPS57196609A/en
Publication of JPS57196609A publication Critical patent/JPS57196609A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Landscapes

  • Television Receiver Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To prevent the change of a video signal output due to temperature and the dispersion in a contrast adjusting function, by making the gain adjustment indirectly, that is, in the way of DC level. CONSTITUTION:The base of the 1st transistor (TR)11 is connected to a variable DC voltage source and the collector is connected to a power supply terminal 8 via a resistor 16. The base of the 2nd TR12 is connected to a fixed DC voltage source 18 and the collector is connected to the 1st TR11. At least one of the 3rd TRs 13-15 is provided, the collector is connected to a power supply terminal 8 and the emitters are commonly connected. A differential amplifier is composed of the TRs 11-15. The 4th TR9 is provided between the common connecting point of said emitter and ground of the differential amplifier, and the base is taken as a signal input terminal 4 and the collector is provided with an output terminal 5.
JP8227781A 1981-05-28 1981-05-28 Gain adjusting circuit Pending JPS57196609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8227781A JPS57196609A (en) 1981-05-28 1981-05-28 Gain adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8227781A JPS57196609A (en) 1981-05-28 1981-05-28 Gain adjusting circuit

Publications (1)

Publication Number Publication Date
JPS57196609A true JPS57196609A (en) 1982-12-02

Family

ID=13769997

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8227781A Pending JPS57196609A (en) 1981-05-28 1981-05-28 Gain adjusting circuit

Country Status (1)

Country Link
JP (1) JPS57196609A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6097712A (en) * 1983-11-01 1985-05-31 Mitsubishi Electric Corp Variable gain amplifier
WO2004027987A1 (en) * 2002-09-19 2004-04-01 Mitsubishi Denki Kabushiki Kaisha Variable gain amplifier
JP2015192268A (en) * 2014-03-28 2015-11-02 日本電信電話株式会社 variable gain transimpedance amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6097712A (en) * 1983-11-01 1985-05-31 Mitsubishi Electric Corp Variable gain amplifier
WO2004027987A1 (en) * 2002-09-19 2004-04-01 Mitsubishi Denki Kabushiki Kaisha Variable gain amplifier
JP2015192268A (en) * 2014-03-28 2015-11-02 日本電信電話株式会社 variable gain transimpedance amplifier

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