JPS54136158A - Gain control amplifier - Google Patents

Gain control amplifier

Info

Publication number
JPS54136158A
JPS54136158A JP4270078A JP4270078A JPS54136158A JP S54136158 A JPS54136158 A JP S54136158A JP 4270078 A JP4270078 A JP 4270078A JP 4270078 A JP4270078 A JP 4270078A JP S54136158 A JPS54136158 A JP S54136158A
Authority
JP
Japan
Prior art keywords
collector current
gain control
amplifier
base voltage
sum
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
JP4270078A
Other languages
Japanese (ja)
Other versions
JPS626363B2 (en
Inventor
Shigeo Fujimori
Kenichi Torii
Shoichi Shimizu
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 JP4270078A priority Critical patent/JPS54136158A/en
Publication of JPS54136158A publication Critical patent/JPS54136158A/en
Publication of JPS626363B2 publication Critical patent/JPS626363B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To prevent the deterioration of the cross modulation properties and others by avoiding a big change of the bias conditions for the differential amplifier of the next step when the gain control is given. CONSTITUTION:The collector voltage of transistor Tr11, i.e., the base voltage of differential amplifier 21 of the next step is decided by the sum of the collector current of Tr11 and 13 plus the value of load resistance 15. Thus, the base voltage of amplifier 21 can be kept constant as long as the sum of the collector current is constant. Now if the potential at point A is lowered and the collector current flowing to Tr11 is reduced, the collector current of Tr12 is reduced simultaneously. As a result, the base voltage of Tr13 increases and also the collector current of Tr13 increases. And the sum of the collector current becomes nearly constant between Tr11 and 13. In case this relation is satisfied substantially, the base voltage of amplifier 21 can be kept nearly constant even with the gain control given via the gain control amplifier of the preceding step.
JP4270078A 1978-04-13 1978-04-13 Gain control amplifier Granted JPS54136158A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4270078A JPS54136158A (en) 1978-04-13 1978-04-13 Gain control amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4270078A JPS54136158A (en) 1978-04-13 1978-04-13 Gain control amplifier

Publications (2)

Publication Number Publication Date
JPS54136158A true JPS54136158A (en) 1979-10-23
JPS626363B2 JPS626363B2 (en) 1987-02-10

Family

ID=12643320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4270078A Granted JPS54136158A (en) 1978-04-13 1978-04-13 Gain control amplifier

Country Status (1)

Country Link
JP (1) JPS54136158A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160148600A (en) 2014-05-14 2016-12-26 도쿄 라이트 고교 가부시키가이샤 Cap

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3139970A1 (en) 2019-05-13 2020-11-19 U.S. Well Services, LLC Encoderless vector control for vfd in hydraulic fracturing applications
US11542786B2 (en) 2019-08-01 2023-01-03 U.S. Well Services, LLC High capacity power storage system for electric hydraulic fracturing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160148600A (en) 2014-05-14 2016-12-26 도쿄 라이트 고교 가부시키가이샤 Cap
KR20180125631A (en) 2014-05-14 2018-11-23 도쿄 라이트 고교 가부시키가이샤 Cap

Also Published As

Publication number Publication date
JPS626363B2 (en) 1987-02-10

Similar Documents

Publication Publication Date Title
US4462005A (en) Current mirror circuit
US4820997A (en) Differential amplifier circuit
JPS5514725A (en) Error amplifier circuit
US4297646A (en) Current mirror circuit
JPS54136158A (en) Gain control amplifier
US5258703A (en) Temperature compensated voltage regulator having beta compensation
CA1208313A (en) Differential amplifier
US6184723B1 (en) Direct voltage to PTAT current converter for multiple gain control slope for wide dynamic range VGA
JPS5564421A (en) Variable impedance circuit
JPS56102107A (en) Differential amplifier
EP0351835A3 (en) Logarithmic amplification circuit for obtaining output voltage corresponding to difference between logarithmically amplified values of two input currents
JPS5750115A (en) Gain control circuit
JPS54151360A (en) Schmitt trigger circuit
SU1108415A1 (en) Reference voltage source
JPS56143027A (en) Constant current circuit
SU1157573A2 (en) Analog storage
JPS57143908A (en) Variable gain amplifying circuit
KR840001120B1 (en) Amplifier
JPS5797212A (en) Gain control circuit
JPS5660108A (en) Gain control circuit
JPS56117414A (en) Gain control circuit
JPS5555608A (en) Automatic gain control circuit
JPS5793707A (en) Reference voltage generating circuit
JPS5452962A (en) Intermediate frequency amplifier
JPS57127310A (en) Direct current gain controller