JPS5781712A - Gain variable circuit - Google Patents

Gain variable circuit

Info

Publication number
JPS5781712A
JPS5781712A JP14665381A JP14665381A JPS5781712A JP S5781712 A JPS5781712 A JP S5781712A JP 14665381 A JP14665381 A JP 14665381A JP 14665381 A JP14665381 A JP 14665381A JP S5781712 A JPS5781712 A JP S5781712A
Authority
JP
Japan
Prior art keywords
emitter
differential pair
transistors
varied
current
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
JP14665381A
Other languages
Japanese (ja)
Other versions
JPH0230604B2 (en
Inventor
Nobukazu Hosoya
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP14665381A priority Critical patent/JPH0230604B2/en
Publication of JPS5781712A publication Critical patent/JPS5781712A/en
Publication of JPH0230604B2 publication Critical patent/JPH0230604B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • Processing Of Color Television Signals (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To improve the temperature characteristics, by connecting the 2nd differential pair to the emitter joint of the 1st differential pair to which the input signal is applied and thus varying the emitter DC current of the 2nd differential pair. CONSTITUTION:The 2nd differential pair consisting of transistors T52 and T53 having comparatively large emitter resistances R64 and R65 is connected to the 1st differential pair consisting of transistors T51 and T54 as well as to a differential circuit comprising a constant current transistor T55 and a resistance R67. The point of connection of resistances R68 and R70, i.e. the base potential of the transistor T52 and T53 is varied by controlling a volume VR. Accordingly the emitter current is varied for the transistors T52 and T53. As a result, the DC current flowing between the collector and the emitter of the T51 and T54 is varied to change the gain of the input signal.
JP14665381A 1981-09-16 1981-09-16 RITOKUKAHENKAIRO Expired - Lifetime JPH0230604B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14665381A JPH0230604B2 (en) 1981-09-16 1981-09-16 RITOKUKAHENKAIRO

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14665381A JPH0230604B2 (en) 1981-09-16 1981-09-16 RITOKUKAHENKAIRO

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP55127581A Division JPS5752288A (en) 1980-09-11 1980-09-11 Color gain variable circuit

Publications (2)

Publication Number Publication Date
JPS5781712A true JPS5781712A (en) 1982-05-21
JPH0230604B2 JPH0230604B2 (en) 1990-07-09

Family

ID=15412585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14665381A Expired - Lifetime JPH0230604B2 (en) 1981-09-16 1981-09-16 RITOKUKAHENKAIRO

Country Status (1)

Country Link
JP (1) JPH0230604B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933054A (en) * 1995-09-19 1999-08-03 Nec Corporation Bipolar operational transconductance amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933054A (en) * 1995-09-19 1999-08-03 Nec Corporation Bipolar operational transconductance amplifier

Also Published As

Publication number Publication date
JPH0230604B2 (en) 1990-07-09

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