JPS5696516A - Gain adjusting circuit - Google Patents

Gain adjusting circuit

Info

Publication number
JPS5696516A
JPS5696516A JP17255679A JP17255679A JPS5696516A JP S5696516 A JPS5696516 A JP S5696516A JP 17255679 A JP17255679 A JP 17255679A JP 17255679 A JP17255679 A JP 17255679A JP S5696516 A JPS5696516 A JP S5696516A
Authority
JP
Japan
Prior art keywords
differential amplifier
gain
input signal
trq5
base
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
JP17255679A
Other languages
Japanese (ja)
Inventor
Shigeru Nakajima
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 JP17255679A priority Critical patent/JPS5696516A/en
Publication of JPS5696516A publication Critical patent/JPS5696516A/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

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a wide range of gain adjustment, without deteriorating the distortion characteristics, by the adjustment that the amplitude of an input signal can be adjusted through the adjustment of the gain of a differential amplifier. CONSTITUTION:When a base potential of a transistor (TR) Q5 is sufficiently small, the constant current all flows to a differential amplifier consisting of TRs Q3, Q4, and the differential amplifier has the gain determined with a constant current value and a resistor R3. When the base potential of TRQ5 is increased to the base potential of TRQ6, the constant current is branched to TRQ5, the current fed to a differential amplifier is lowered and the gain is lowered. Simultaneously, a bias is fed to the base of TRQ1 to lower the impedance between the emitter and collector of TRQ1, and the input signal is divided with the impedance of this and input signal terminal Vin to reduce the amplitude of input signal input to the differential amplifier. Thus, the gain of the differential amplifier can be adjusted with the gain control signal fed to the base of TRQ5 and the input signal versus output current characteristics can be made linear.
JP17255679A 1979-12-28 1979-12-28 Gain adjusting circuit Pending JPS5696516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17255679A JPS5696516A (en) 1979-12-28 1979-12-28 Gain adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17255679A JPS5696516A (en) 1979-12-28 1979-12-28 Gain adjusting circuit

Publications (1)

Publication Number Publication Date
JPS5696516A true JPS5696516A (en) 1981-08-04

Family

ID=15944037

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17255679A Pending JPS5696516A (en) 1979-12-28 1979-12-28 Gain adjusting circuit

Country Status (1)

Country Link
JP (1) JPS5696516A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369469A2 (en) * 1988-11-18 1990-05-23 Sanyo Electric Co., Ltd. Variable gain amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369469A2 (en) * 1988-11-18 1990-05-23 Sanyo Electric Co., Ltd. Variable gain amplifier

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