JPS5545231A - Variable gain amplifier circuit - Google Patents

Variable gain amplifier circuit

Info

Publication number
JPS5545231A
JPS5545231A JP11826778A JP11826778A JPS5545231A JP S5545231 A JPS5545231 A JP S5545231A JP 11826778 A JP11826778 A JP 11826778A JP 11826778 A JP11826778 A JP 11826778A JP S5545231 A JPS5545231 A JP S5545231A
Authority
JP
Japan
Prior art keywords
circuit
output
gain
input
feedback quantity
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
JP11826778A
Other languages
Japanese (ja)
Inventor
Saburo Takaoka
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 JP11826778A priority Critical patent/JPS5545231A/en
Priority to GB7933037A priority patent/GB2034138B/en
Priority to US06/078,269 priority patent/US4328465A/en
Priority to DE19792938798 priority patent/DE2938798A1/en
Publication of JPS5545231A publication Critical patent/JPS5545231A/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 the logarithmic change of gain linear for the change of a feedback quantity by providing gain control circuit, which changes the feedback quantity to control gain, and mixers in the output and the input and connecting the input-side mixer and the gain control circuit through a resistance. CONSTITUTION:The output of gain control circuit 1 of feedback quantity x becomes xX for the input of state variable X. Output signal xX of circuit 1 and input signal ei are mixed by first mixer circuit 2, and the output is inputted to not only circuit 1 through resistance Ro but also second mixer circuit 3. In circuit 3, output xX of circuit 1 and output X=ei+xX of circuit 2 are mixed to output voltage eo=ei(1+x)/(1-x). When logarithms of gain G=eo/ei of this circuit are subjected to progression expansion to take up to the first term, lnG 2x is true approximately; however, the approximate error caused by the second term and succeeding terms removed in progression expansion is corrected by adjusting resistance Ro, and the relation between gain of the feedback and logarithms becomes linear. A linear attenuation logarithmic characteristic can be obtained for the feedback quantity by providing a phase switching circuit in the output of circuit 2.
JP11826778A 1978-09-26 1978-09-26 Variable gain amplifier circuit Pending JPS5545231A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP11826778A JPS5545231A (en) 1978-09-26 1978-09-26 Variable gain amplifier circuit
GB7933037A GB2034138B (en) 1978-09-26 1979-09-24 Variable gain amplifier circuit
US06/078,269 US4328465A (en) 1978-09-26 1979-09-24 Tone control circuit utilizing variable gain amplifier
DE19792938798 DE2938798A1 (en) 1978-09-26 1979-09-25 CONTROL AMPLIFIER CIRCUIT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11826778A JPS5545231A (en) 1978-09-26 1978-09-26 Variable gain amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5545231A true JPS5545231A (en) 1980-03-29

Family

ID=14732396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11826778A Pending JPS5545231A (en) 1978-09-26 1978-09-26 Variable gain amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5545231A (en)

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

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