JPS5635515A - Automatic gain control amplifier - Google Patents

Automatic gain control amplifier

Info

Publication number
JPS5635515A
JPS5635515A JP11107379A JP11107379A JPS5635515A JP S5635515 A JPS5635515 A JP S5635515A JP 11107379 A JP11107379 A JP 11107379A JP 11107379 A JP11107379 A JP 11107379A JP S5635515 A JPS5635515 A JP S5635515A
Authority
JP
Japan
Prior art keywords
temperature
gain control
fluctuation
change
base
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
JP11107379A
Other languages
Japanese (ja)
Other versions
JPS625398B2 (en
Inventor
Shinichiro Taguchi
Yutaka Ogiwara
Nobuya Nagao
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 JP11107379A priority Critical patent/JPS5635515A/en
Publication of JPS5635515A publication Critical patent/JPS5635515A/en
Publication of JPS625398B2 publication Critical patent/JPS625398B2/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
    • H03G3/20—Automatic control

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To realize not only the miniaturization but the enhancement of the performance for the amplifier, by scuring a direct coupling for both the input signal switching part to share the gain control part of the color signal for the recording and reproduction and then avoiding the fluctuation of the DC bias of the electronic switch circuit at the switching part against the change of temperature. CONSTITUTION:Transistors TRQ10 and Q11 function as the exculsive switching TR to each other, and is thus turned on or off exclusively by the switch signal applied to the switch signal input terminals 21 and 22. At the same time, the TRQ3 forms the emitter-follower circuit which functions as a tempeature compensating dummy for the base-emitter voltage VBF of the TRs Q1 and Q2. And the 3rd DC bias power source E3 is selected so that the equation (2) may be satisfied under the base- emitter voltage defined as VF, the absolute temperature as T and the conditions of 0<=alpha<=1. As a result, no fluctuation is caused for the DC potential Eout of the output terminal and even with the change of temperature.
JP11107379A 1979-08-31 1979-08-31 Automatic gain control amplifier Granted JPS5635515A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11107379A JPS5635515A (en) 1979-08-31 1979-08-31 Automatic gain control amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11107379A JPS5635515A (en) 1979-08-31 1979-08-31 Automatic gain control amplifier

Publications (2)

Publication Number Publication Date
JPS5635515A true JPS5635515A (en) 1981-04-08
JPS625398B2 JPS625398B2 (en) 1987-02-04

Family

ID=14551688

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11107379A Granted JPS5635515A (en) 1979-08-31 1979-08-31 Automatic gain control amplifier

Country Status (1)

Country Link
JP (1) JPS5635515A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5065209A (en) * 1973-10-11 1975-06-02
JPS5397730A (en) * 1977-02-08 1978-08-26 Matsushita Electric Ind Co Ltd Noise reduction device for television picture receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5065209A (en) * 1973-10-11 1975-06-02
JPS5397730A (en) * 1977-02-08 1978-08-26 Matsushita Electric Ind Co Ltd Noise reduction device for television picture receiver

Also Published As

Publication number Publication date
JPS625398B2 (en) 1987-02-04

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