JPS56732A - Amplifying circuit for gain control - Google Patents

Amplifying circuit for gain control

Info

Publication number
JPS56732A
JPS56732A JP6612279A JP6612279A JPS56732A JP S56732 A JPS56732 A JP S56732A JP 6612279 A JP6612279 A JP 6612279A JP 6612279 A JP6612279 A JP 6612279A JP S56732 A JPS56732 A JP S56732A
Authority
JP
Japan
Prior art keywords
voltage
amplifier
inputting
controlled
output signal
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
JP6612279A
Other languages
Japanese (ja)
Inventor
Noriaki Fujimura
Tsuneo Kinoshita
Masa Aono
Takashi Kako
Hiroya Tanaka
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 JP6612279A priority Critical patent/JPS56732A/en
Publication of JPS56732A publication Critical patent/JPS56732A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To increase the quality of line, by enabling to remove the harmonic distortion and DC offset at the same time, through the provision of two voltage controlled amplifiers inverting and inputting the input signal as it is. CONSTITUTION:The voltage control amplifier 61' inputting the input voltage Vi as it is and the voltage control amplifier 61'' inputting the voltage Vi with the inverter 66 after inversion are provided. These two amplifiers 61', 61'' are controlled with one control voltage Vc, which converts the output voltage Vo into DC voltage Vo' with the rectifier 62 and the smoothing unit 63, and after obtaining the difference between this voltage Vo' and the reference voltage VR preset at the operator 64, this is amplified 65. Thus, the difference between the output signal (a) of the amplifier 61' controlled with the voltage Vc and the output signal (b) of the amplifier 61'' is taken at the operator 67, cancelling the harmonic distortion included in each output signal and DC offset due to leakage of the voltage Vc.
JP6612279A 1979-05-30 1979-05-30 Amplifying circuit for gain control Pending JPS56732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6612279A JPS56732A (en) 1979-05-30 1979-05-30 Amplifying circuit for gain control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6612279A JPS56732A (en) 1979-05-30 1979-05-30 Amplifying circuit for gain control

Publications (1)

Publication Number Publication Date
JPS56732A true JPS56732A (en) 1981-01-07

Family

ID=13306749

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6612279A Pending JPS56732A (en) 1979-05-30 1979-05-30 Amplifying circuit for gain control

Country Status (1)

Country Link
JP (1) JPS56732A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112021005379T5 (en) 2020-10-12 2023-07-20 Denso Corporation leakage current determination device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120155A (en) * 1975-04-15 1976-10-21 Oki Electric Ind Co Ltd Balanced type dc feedback gain control circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120155A (en) * 1975-04-15 1976-10-21 Oki Electric Ind Co Ltd Balanced type dc feedback gain control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112021005379T5 (en) 2020-10-12 2023-07-20 Denso Corporation leakage current determination device

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