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JPS5545230A - Variable gain amplifier circuit - Google Patents

Variable gain amplifier circuit

Info

Publication number
JPS5545230A
JPS5545230A JP11826678A JP11826678A JPS5545230A JP S5545230 A JPS5545230 A JP S5545230A JP 11826678 A JP11826678 A JP 11826678A JP 11826678 A JP11826678 A JP 11826678A JP S5545230 A JPS5545230 A JP S5545230A
Authority
JP
Japan
Prior art keywords
gain
circuit
feedback quantity
input
logarithmic
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
JP11826678A
Other languages
Japanese (ja)
Inventor
Ryoji Azuma
Hiroyuki Hirano
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 JP11826678A priority Critical patent/JPS5545230A/en
Priority to US06/078,269 priority patent/US4328465A/en
Priority to GB7933037A priority patent/GB2034138B/en
Priority to DE19792938798 priority patent/DE2938798A1/en
Publication of JPS5545230A publication Critical patent/JPS5545230A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make it possible that gain changes logarithmic-linearly for the change of a feedback quantity by providing mixer circuits in the output and the input of a gain control circuit, which has an operational amplifier and changes the feedback quantity to control gain, to constitute a variable gain amplifier circuit. CONSTITUTION:Gain control circuit 1 which is constituted by an operational amplifier and has feedback quantity x generates output xX for the input of state variable X. This output xX is mixed with input signal ei by first mixer circuit 2 and is mixed with the state variable by second mixer circuit 3 to obtain output voltage eo=X+xX. Eo/ei=(1+x)/(1-x) is true because of variable X=ei+xX. When logarithms of gain G=eo/ei are taken and are subjected to progression expansion to take up to the first term, lnG=2x is true, so that gain can be changed logarithmic-linearly for the linear change of the feedback quantity. If a phase switching circuit is provided in the input of circuit 1, the logarithmic-linear attenuation characteristic can be obtained.
JP11826678A 1978-09-26 1978-09-26 Variable gain amplifier circuit Pending JPS5545230A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP11826678A JPS5545230A (en) 1978-09-26 1978-09-26 Variable gain amplifier circuit
US06/078,269 US4328465A (en) 1978-09-26 1979-09-24 Tone control circuit utilizing variable gain amplifier
GB7933037A GB2034138B (en) 1978-09-26 1979-09-24 Variable gain amplifier circuit
DE19792938798 DE2938798A1 (en) 1978-09-26 1979-09-25 CONTROL AMPLIFIER CIRCUIT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11826678A JPS5545230A (en) 1978-09-26 1978-09-26 Variable gain amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5545230A true JPS5545230A (en) 1980-03-29

Family

ID=14732371

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11826678A Pending JPS5545230A (en) 1978-09-26 1978-09-26 Variable gain amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5545230A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60259008A (en) * 1984-06-05 1985-12-21 Comput Basic Mach Technol Res Assoc Variable gain amplifier
JPS60259007A (en) * 1984-06-05 1985-12-21 Comput Basic Mach Technol Res Assoc Variable gain amplifier
US4628276A (en) * 1983-12-15 1986-12-09 Matsushita Graphic Communications Systems, Inc. Logarithmically linearly controlled variable gain amplifier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511503A (en) * 1974-06-27 1976-01-08 Ngk Insulators Ltd TASOSERAMITSUKUKIBANNO SEIZOHO
JPS5313860A (en) * 1976-07-23 1978-02-07 Pioneer Electronic Corp Tone control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511503A (en) * 1974-06-27 1976-01-08 Ngk Insulators Ltd TASOSERAMITSUKUKIBANNO SEIZOHO
JPS5313860A (en) * 1976-07-23 1978-02-07 Pioneer Electronic Corp Tone control device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628276A (en) * 1983-12-15 1986-12-09 Matsushita Graphic Communications Systems, Inc. Logarithmically linearly controlled variable gain amplifier
JPS60259008A (en) * 1984-06-05 1985-12-21 Comput Basic Mach Technol Res Assoc Variable gain amplifier
JPS60259007A (en) * 1984-06-05 1985-12-21 Comput Basic Mach Technol Res Assoc Variable gain amplifier

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