JPS5696514A - Amplifying circuit with variable gain - Google Patents

Amplifying circuit with variable gain

Info

Publication number
JPS5696514A
JPS5696514A JP17081679A JP17081679A JPS5696514A JP S5696514 A JPS5696514 A JP S5696514A JP 17081679 A JP17081679 A JP 17081679A JP 17081679 A JP17081679 A JP 17081679A JP S5696514 A JPS5696514 A JP S5696514A
Authority
JP
Japan
Prior art keywords
voltage
circuit
current
amplifiers
conversion circuit
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
JP17081679A
Other languages
Japanese (ja)
Other versions
JPS641973B2 (en
Inventor
Kenji Yokoyama
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP17081679A priority Critical patent/JPS5696514A/en
Priority to US06/133,990 priority patent/US4331929A/en
Priority to DE19803012965 priority patent/DE3012965A1/en
Publication of JPS5696514A publication Critical patent/JPS5696514A/en
Publication of JPS641973B2 publication Critical patent/JPS641973B2/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
    • H03G1/0017—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

Abstract

PURPOSE:To reduce S/N without changing distortion factor, by constituting the circuit with two differential amplifiers, current Miller circuit, voltage-current conversion circuit and current-voltage conversion circuit. CONSTITUTION:A current Miller circuit 24 being a common load is connected to differential amplifiers 22, 23. A voltage-current conversion circuit 26 which changes common emitter currents i1, i2 of the amplifiers 22, 23 in opposite phase according to the input signal fed to input terminals 25a, 25b, is connected to a common emitter circuit to the amplifiers 22, 23. Further, an output voltage V0 is obtained from a connection point 27 between the amplifiers 22, 23 and a circuit 24 via a current- voltage conversion circuit 28. With such circuit constitution, the output voltage V0 is proportional to an input voltage Vi, and the gain is determined with the exponential function of a control voltage given to the terminal 35. When the control voltage is increased and the gain is decreased, the collector currents i3, i4 of transistors 29, 33 are decreased, resulting that noise voltage is made smaller.
JP17081679A 1979-04-04 1979-12-29 Amplifying circuit with variable gain Granted JPS5696514A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP17081679A JPS5696514A (en) 1979-12-29 1979-12-29 Amplifying circuit with variable gain
US06/133,990 US4331929A (en) 1979-04-04 1980-03-26 Gain-controlled amplifier
DE19803012965 DE3012965A1 (en) 1979-04-04 1980-04-02 GAIN-CONTROLLED AMPLIFIER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17081679A JPS5696514A (en) 1979-12-29 1979-12-29 Amplifying circuit with variable gain

Publications (2)

Publication Number Publication Date
JPS5696514A true JPS5696514A (en) 1981-08-04
JPS641973B2 JPS641973B2 (en) 1989-01-13

Family

ID=15911858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17081679A Granted JPS5696514A (en) 1979-04-04 1979-12-29 Amplifying circuit with variable gain

Country Status (1)

Country Link
JP (1) JPS5696514A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108749A (en) * 1975-03-20 1976-09-27 Tokyo Shibaura Electric Co DENATSUSEIGYOKAHENRITOKUKAIRO

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108749A (en) * 1975-03-20 1976-09-27 Tokyo Shibaura Electric Co DENATSUSEIGYOKAHENRITOKUKAIRO

Also Published As

Publication number Publication date
JPS641973B2 (en) 1989-01-13

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