JPS5780816A - Voltage control variable gain circuit - Google Patents

Voltage control variable gain circuit

Info

Publication number
JPS5780816A
JPS5780816A JP55157325A JP15732580A JPS5780816A JP S5780816 A JPS5780816 A JP S5780816A JP 55157325 A JP55157325 A JP 55157325A JP 15732580 A JP15732580 A JP 15732580A JP S5780816 A JPS5780816 A JP S5780816A
Authority
JP
Japan
Prior art keywords
input terminal
circuit
operational amplifier
output
band
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
JP55157325A
Other languages
Japanese (ja)
Other versions
JPS6411165B2 (en
Inventor
Masayuki Katakura
Kenzo Akagiri
Motomi Okochi
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP55157325A priority Critical patent/JPS5780816A/en
Publication of JPS5780816A publication Critical patent/JPS5780816A/en
Publication of JPS6411165B2 publication Critical patent/JPS6411165B2/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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements

Landscapes

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

Abstract

PURPOSE:To reduce the lowering of stability and te lowering of a high band due to the land of a feedback circuit, by limiting the gain variation in an extrahigh band at the outside of the audible band. CONSTITUTION:An input terminal 41 is conncted to an inversion input terminal of an operational amplifier 43 through a resistance 45. The noninversion input terminal of the opertional amplifier 43 is grounded, and the output terminal is connected to a current dividing circuit 44 through a resistance 54. One of two outputs divided by the current dividing circuit 44 is sent to an output teminal 42, and the other is fed back to the inversion input terminal of the operational amplifier 43. The current dividing circuit 44 divides an output current (ia) of the operational amplifier 43 to the feedback line and the output line in proportion (gi):(go). Values of (go) and (gi) are changed in accordance with a control voltage to obtain a voltage control variable gain circuit where the gain is changed. Further, a band limitng circuit 51 where a resistance 52 and a capacitor 53 are connected in series is connected between the output terminal and the noninversion input terminal of the operational amplifier 43.
JP55157325A 1980-11-08 1980-11-08 Voltage control variable gain circuit Granted JPS5780816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55157325A JPS5780816A (en) 1980-11-08 1980-11-08 Voltage control variable gain circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55157325A JPS5780816A (en) 1980-11-08 1980-11-08 Voltage control variable gain circuit

Publications (2)

Publication Number Publication Date
JPS5780816A true JPS5780816A (en) 1982-05-20
JPS6411165B2 JPS6411165B2 (en) 1989-02-23

Family

ID=15647221

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55157325A Granted JPS5780816A (en) 1980-11-08 1980-11-08 Voltage control variable gain circuit

Country Status (1)

Country Link
JP (1) JPS5780816A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0351025A (en) * 1989-07-20 1991-03-05 Matsushita Electric Ind Co Ltd Floor nozzle for vacuum cleaner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503442U (en) * 1973-05-11 1975-01-14
JPS5248952A (en) * 1975-10-17 1977-04-19 Toshiba Corp Voltage control variable gain circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503442U (en) * 1973-05-11 1975-01-14
JPS5248952A (en) * 1975-10-17 1977-04-19 Toshiba Corp Voltage control variable gain circuit

Also Published As

Publication number Publication date
JPS6411165B2 (en) 1989-02-23

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