JPS56114413A - Current control type variable gain amplifying circuit - Google Patents

Current control type variable gain amplifying circuit

Info

Publication number
JPS56114413A
JPS56114413A JP1586680A JP1586680A JPS56114413A JP S56114413 A JPS56114413 A JP S56114413A JP 1586680 A JP1586680 A JP 1586680A JP 1586680 A JP1586680 A JP 1586680A JP S56114413 A JPS56114413 A JP S56114413A
Authority
JP
Japan
Prior art keywords
control type
current control
type variable
diodes
input
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
JP1586680A
Other languages
Japanese (ja)
Inventor
Fumihiko Yokogawa
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP1586680A priority Critical patent/JPS56114413A/en
Publication of JPS56114413A publication Critical patent/JPS56114413A/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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Abstract

PURPOSE:To simplify a circuit constitution, by controlling a supply current through the formation of both of a negative feedback resistive element and an input resistive element which determines the amplified gain with a current control type variable resistive element. CONSTITUTION:N sets of diodes D1-DN are connected in series between the output and inverting input of an operational amplifier 1 to constitute the impedance element of the negative feedback circuit. The input signal VIN is fed to diodes D1'- DM' of M sets in series connection operated as input impedance element to the inverting input. The current supply sources 2, 3 feed currents I1, I2 to both the diodes. The gain of the entire circuit is G=(N.I2)/(M.I1), (where N,M are natural numbers). The gain is controlled by controlling the currents I1 and I2.
JP1586680A 1980-02-12 1980-02-12 Current control type variable gain amplifying circuit Pending JPS56114413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1586680A JPS56114413A (en) 1980-02-12 1980-02-12 Current control type variable gain amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1586680A JPS56114413A (en) 1980-02-12 1980-02-12 Current control type variable gain amplifying circuit

Publications (1)

Publication Number Publication Date
JPS56114413A true JPS56114413A (en) 1981-09-09

Family

ID=11900716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1586680A Pending JPS56114413A (en) 1980-02-12 1980-02-12 Current control type variable gain amplifying circuit

Country Status (1)

Country Link
JP (1) JPS56114413A (en)

Similar Documents

Publication Publication Date Title
JPS55136708A (en) Voltage current conversion circuit
JPS56114413A (en) Current control type variable gain amplifying circuit
ES8102434A1 (en) Amplifier and power supply circuit
JPS5582512A (en) Amplifier
JPS56114412A (en) Variable gain amplifying circuit of current control type
JPS5494213A (en) Amplifier for transmitter
JPS57199396A (en) Speaker input controlling circuit
JPS5780816A (en) Voltage control variable gain circuit
JPS5620315A (en) Low-frequency amplifying circuit
JPS54100644A (en) Automatic gain control system
JPS6451704A (en) Feedback amplifier circuit
JPS5518130A (en) Offset circuit
JPS5555608A (en) Automatic gain control circuit
JPS5696307A (en) Constant-current circuit
JPS5582519A (en) Amplifier
JPS5366143A (en) Power amplifier circuit
JPS57141114A (en) Output characteristic control circuit of amplifier
JPS568908A (en) Amplifier
JPS5779722A (en) Automatic gain controlling circuit
JPS5482948A (en) Functional amplifier
JPS5678207A (en) Line amplifier
JPS56164412A (en) Constant voltage regulated power supply circuit
JPS5585115A (en) Gain control and amplifying circuit
JPS5539918A (en) Voltage and current output circuit
JPS5441053A (en) Gain control amplifier