JPS57181215A - Variable gain circuit - Google Patents

Variable gain circuit

Info

Publication number
JPS57181215A
JPS57181215A JP6596081A JP6596081A JPS57181215A JP S57181215 A JPS57181215 A JP S57181215A JP 6596081 A JP6596081 A JP 6596081A JP 6596081 A JP6596081 A JP 6596081A JP S57181215 A JPS57181215 A JP S57181215A
Authority
JP
Japan
Prior art keywords
signal
voltage
variable gain
output
gain 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.)
Granted
Application number
JP6596081A
Other languages
Japanese (ja)
Other versions
JPS6332286B2 (en
Inventor
Hisashi Yamada
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6596081A priority Critical patent/JPS57181215A/en
Publication of JPS57181215A publication Critical patent/JPS57181215A/en
Publication of JPS6332286B2 publication Critical patent/JPS6332286B2/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
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a variable gain circuit suitable for IC-implementation and to reduce the offset voltage of an output by constituting the variable gain circuit so that transistors (TR) as gain control elements all use NPN ones. CONSTITUTION:A signal from a signal input terminal 1 is processed by the voltage-current conversion of an impedance element R1, and the resulting signal is applied to the uninverted input terminal of an amplifier A1. The output of this amplifier A1 is applied to TR circuits Q31-Q34 connected as shown in the figure. A voltage at a connection point between the collector of the 3rd TRQ33 and the emitter of the 4th TRQ34 among said TR circuits is processed by current-voltage conversion through an amplifying circuit A2 and an R2, and the resulting signal is led out to a signal output terminal 2. Then, the ratio of bias currents of the respective TRs is varied in accordance with gain control signals S1-S4 supplied externally, thus controlling the gain.
JP6596081A 1981-04-30 1981-04-30 Variable gain circuit Granted JPS57181215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6596081A JPS57181215A (en) 1981-04-30 1981-04-30 Variable gain circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6596081A JPS57181215A (en) 1981-04-30 1981-04-30 Variable gain circuit

Publications (2)

Publication Number Publication Date
JPS57181215A true JPS57181215A (en) 1982-11-08
JPS6332286B2 JPS6332286B2 (en) 1988-06-29

Family

ID=13302057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6596081A Granted JPS57181215A (en) 1981-04-30 1981-04-30 Variable gain circuit

Country Status (1)

Country Link
JP (1) JPS57181215A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04117710A (en) * 1990-09-03 1992-04-17 Nec Ic Microcomput Syst Ltd Gain variable amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04117710A (en) * 1990-09-03 1992-04-17 Nec Ic Microcomput Syst Ltd Gain variable amplifier

Also Published As

Publication number Publication date
JPS6332286B2 (en) 1988-06-29

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