JPS56162520A - Differential amplifying circuit - Google Patents

Differential amplifying circuit

Info

Publication number
JPS56162520A
JPS56162520A JP6682080A JP6682080A JPS56162520A JP S56162520 A JPS56162520 A JP S56162520A JP 6682080 A JP6682080 A JP 6682080A JP 6682080 A JP6682080 A JP 6682080A JP S56162520 A JPS56162520 A JP S56162520A
Authority
JP
Japan
Prior art keywords
output
amplifier
gain
noninversion
controlled
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
JP6682080A
Other languages
Japanese (ja)
Other versions
JPS6231850B2 (en
Inventor
Takafumi Nakajo
Toshitaka Tsuda
Norio Murakami
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 JP6682080A priority Critical patent/JPS56162520A/en
Publication of JPS56162520A publication Critical patent/JPS56162520A/en
Publication of JPS6231850B2 publication Critical patent/JPS6231850B2/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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Abstract

PURPOSE:To obtain a gain-controlled noninversion and inversion output having symmetry, by using an amplifier which has the same gain as the inphase gain of a differential amplifier for inversion when obtaining the gain controlled noninversion and inversion output used for PCM communication, etc. CONSTITUTION:An amplifier 11 is an equivalent circuit for the inphase input of a differential amplifier 12 and has the same gain as the inphase gain of the amplifier 12. Therefore, when an input signal VIN is at a reference voltage VDC, the output VOUTIDC of the amplifier 11 is an output VODC equal to the noninversion output VOUT+ of the amplifier 12. As the signal VIN is inputted, a signal obtained by amplifying a difference between the signal VIN and reference voltage VDC appears at the noninversion output VOUT+ of the amplifier 12. The gains of the amplifiers 11 and 12 are controlled by a gain control voltage VAGC and reference voltage VRAGC and the output signal VOUT1+ and output signal VOUT1DC are equally gain-controlled. Receiving both the signals VOUT1+ and VOUT1DC, a differential amplifier 13 amplifies their difference to generate a noninversion output VOUT2+ and inversion output VOUT2-.
JP6682080A 1980-05-19 1980-05-19 Differential amplifying circuit Granted JPS56162520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6682080A JPS56162520A (en) 1980-05-19 1980-05-19 Differential amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6682080A JPS56162520A (en) 1980-05-19 1980-05-19 Differential amplifying circuit

Publications (2)

Publication Number Publication Date
JPS56162520A true JPS56162520A (en) 1981-12-14
JPS6231850B2 JPS6231850B2 (en) 1987-07-10

Family

ID=13326865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6682080A Granted JPS56162520A (en) 1980-05-19 1980-05-19 Differential amplifying circuit

Country Status (1)

Country Link
JP (1) JPS56162520A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143509A (en) * 1985-12-18 1987-06-26 Matsushita Electric Ind Co Ltd Operational amplifier
JP2007082175A (en) * 2005-09-14 2007-03-29 Princeton Technology Corp Voltage controlled amplifier in signal processing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143509A (en) * 1985-12-18 1987-06-26 Matsushita Electric Ind Co Ltd Operational amplifier
JP2007082175A (en) * 2005-09-14 2007-03-29 Princeton Technology Corp Voltage controlled amplifier in signal processing system

Also Published As

Publication number Publication date
JPS6231850B2 (en) 1987-07-10

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