JPS5689110A - Variable gain amplifying circuit - Google Patents

Variable gain amplifying circuit

Info

Publication number
JPS5689110A
JPS5689110A JP16722779A JP16722779A JPS5689110A JP S5689110 A JPS5689110 A JP S5689110A JP 16722779 A JP16722779 A JP 16722779A JP 16722779 A JP16722779 A JP 16722779A JP S5689110 A JPS5689110 A JP S5689110A
Authority
JP
Japan
Prior art keywords
resistances
parallel
increased
gain
amplifying 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.)
Pending
Application number
JP16722779A
Other languages
Japanese (ja)
Inventor
Shin Abe
Toshikatsu Wataya
Yoshitaka Oike
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 JP16722779A priority Critical patent/JPS5689110A/en
Publication of JPS5689110A publication Critical patent/JPS5689110A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make the output level constant independently of relative differences, by providing plural circuits, which become conductive for the voltage between the input and the output of the negative feedback circuit with values different from one another, in parallel. CONSTITUTION:For the input increased, since amplification is performed with the gain determined by resistances R1 and R2 first, the output is increased, and diode D1 becomes conductive by increment components, and resistances R2 and R1 are connected in parallel. Therefore, the feedback resistance becomes smaller, and the gain of the amplifying circuit is lowered to reduce the output level. According as the input waveform is increased, resistances R3, R4 and R5 are connected in parallel, and the feedback resistance becomes smaller to lower the gain.
JP16722779A 1979-12-22 1979-12-22 Variable gain amplifying circuit Pending JPS5689110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16722779A JPS5689110A (en) 1979-12-22 1979-12-22 Variable gain amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16722779A JPS5689110A (en) 1979-12-22 1979-12-22 Variable gain amplifying circuit

Publications (1)

Publication Number Publication Date
JPS5689110A true JPS5689110A (en) 1981-07-20

Family

ID=15845798

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16722779A Pending JPS5689110A (en) 1979-12-22 1979-12-22 Variable gain amplifying circuit

Country Status (1)

Country Link
JP (1) JPS5689110A (en)

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