JPS5635514A - Gain control amplifier - Google Patents

Gain control amplifier

Info

Publication number
JPS5635514A
JPS5635514A JP11108779A JP11108779A JPS5635514A JP S5635514 A JPS5635514 A JP S5635514A JP 11108779 A JP11108779 A JP 11108779A JP 11108779 A JP11108779 A JP 11108779A JP S5635514 A JPS5635514 A JP S5635514A
Authority
JP
Japan
Prior art keywords
offset voltage
source
gain control
temperature
resistance
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.)
Pending
Application number
JP11108779A
Other languages
Japanese (ja)
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 JP11108779A priority Critical patent/JPS5635514A/en
Publication of JPS5635514A publication Critical patent/JPS5635514A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To suppress the fluctuation of the offset voltage due to the change of temperature and at the same time carrying out a gain control with a low impedance, by obtaining the offset voltage of the gain control amplifier by an adequate resistance. CONSTITUTION:The output of the DC bias power source E1 is applied to the constant current source IB via the resistance R8 as well as to the emitter-follower circuit 12. The color signal is supplied to the differential amplifier 13 from the input terminal 14, and the output color signal is led out through the output terminal 15. The resistance R8 to function to apply the offset voltage is connected to the source IB for bias. And thus an optional offset voltage (IBXR8) can be obtained by varying the value of the reisistance R8 or the current IB of the source IB. Also the compensation of temperature is added to the source IB to suppress the fluctuation of the offset voltage due to the change of temperature.
JP11108779A 1979-08-31 1979-08-31 Gain control amplifier Pending JPS5635514A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11108779A JPS5635514A (en) 1979-08-31 1979-08-31 Gain control amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11108779A JPS5635514A (en) 1979-08-31 1979-08-31 Gain control amplifier

Publications (1)

Publication Number Publication Date
JPS5635514A true JPS5635514A (en) 1981-04-08

Family

ID=14552046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11108779A Pending JPS5635514A (en) 1979-08-31 1979-08-31 Gain control amplifier

Country Status (1)

Country Link
JP (1) JPS5635514A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728412A (en) * 1980-07-29 1982-02-16 Nec Corp Gain control circuit
JPH0246013A (en) * 1988-08-06 1990-02-15 Mitsubishi Electric Corp Gain variable amplifier circuit
JPH02137508A (en) * 1988-11-18 1990-05-25 Toshiba Corp Gain control circuit
JP2003060456A (en) * 2001-08-16 2003-02-28 Matsushita Electric Ind Co Ltd Variable gain amplifier circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728412A (en) * 1980-07-29 1982-02-16 Nec Corp Gain control circuit
JPS6337965B2 (en) * 1980-07-29 1988-07-27 Nippon Denki Kk
JPH0246013A (en) * 1988-08-06 1990-02-15 Mitsubishi Electric Corp Gain variable amplifier circuit
JPH02137508A (en) * 1988-11-18 1990-05-25 Toshiba Corp Gain control circuit
JP2003060456A (en) * 2001-08-16 2003-02-28 Matsushita Electric Ind Co Ltd Variable gain amplifier circuit

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