JPS5741012A - Variable gain circuit using field effect transistor - Google Patents

Variable gain circuit using field effect transistor

Info

Publication number
JPS5741012A
JPS5741012A JP11580480A JP11580480A JPS5741012A JP S5741012 A JPS5741012 A JP S5741012A JP 11580480 A JP11580480 A JP 11580480A JP 11580480 A JP11580480 A JP 11580480A JP S5741012 A JPS5741012 A JP S5741012A
Authority
JP
Japan
Prior art keywords
fetf1
source
substrate
field effect
effect transistor
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
JP11580480A
Other languages
Japanese (ja)
Other versions
JPS6228607B2 (en
Inventor
Masao Takeda
Kyoji Shinohara
Kiyoshi Minematsu
Yoshio Takekoshi
Shinichi Tsuchida
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11580480A priority Critical patent/JPS5741012A/en
Publication of JPS5741012A publication Critical patent/JPS5741012A/en
Publication of JPS6228607B2 publication Critical patent/JPS6228607B2/ja
Granted 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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/007—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using FET type devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To decrease generation of a secondary distortion, by providing a variable impedance element consisting of an FET, between the emitters or the collectors of differential amplifying circuits, and also grounding its substrate through a capacitor. CONSTITUTION:A control voltage source having a low enough AC output impedance is connected to a gate terminal of an FET provided between paired differential amplifiers. An input signal applied between terminals 1, 2 is transferred to the drain and the source of an FETF1 through transistors Q1, Q2, respectively. As a result, the gate-source voltage of the FETF1 is given by the sum of half input voltage and control voltage. In the FETF1, however, since there is a parasitic capacity between the channel and the substrate, a capacitor C1 is provided between the substrate SUB and ground in order to prevent deterioration of a secondary distortion.
JP11580480A 1980-08-25 1980-08-25 Variable gain circuit using field effect transistor Granted JPS5741012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11580480A JPS5741012A (en) 1980-08-25 1980-08-25 Variable gain circuit using field effect transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11580480A JPS5741012A (en) 1980-08-25 1980-08-25 Variable gain circuit using field effect transistor

Publications (2)

Publication Number Publication Date
JPS5741012A true JPS5741012A (en) 1982-03-06
JPS6228607B2 JPS6228607B2 (en) 1987-06-22

Family

ID=14671491

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11580480A Granted JPS5741012A (en) 1980-08-25 1980-08-25 Variable gain circuit using field effect transistor

Country Status (1)

Country Link
JP (1) JPS5741012A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62100569U (en) * 1985-12-14 1987-06-26
JPS62105572U (en) * 1985-12-20 1987-07-06
US4749957A (en) * 1986-02-27 1988-06-07 Yannis Tsividis Semiconductor transconductor circuits
JPH021093A (en) * 1988-12-15 1990-01-05 Fuji Electric Co Ltd Automatic vending machine
JPH081212U (en) * 1995-04-24 1996-07-30 株式会社エムアンドシーシステム Sales management device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62100569U (en) * 1985-12-14 1987-06-26
JPS62105572U (en) * 1985-12-20 1987-07-06
US4749957A (en) * 1986-02-27 1988-06-07 Yannis Tsividis Semiconductor transconductor circuits
JPH021093A (en) * 1988-12-15 1990-01-05 Fuji Electric Co Ltd Automatic vending machine
JPH081212U (en) * 1995-04-24 1996-07-30 株式会社エムアンドシーシステム Sales management device

Also Published As

Publication number Publication date
JPS6228607B2 (en) 1987-06-22

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