JPS5684012A - Agc circuit - Google Patents

Agc circuit

Info

Publication number
JPS5684012A
JPS5684012A JP16032379A JP16032379A JPS5684012A JP S5684012 A JPS5684012 A JP S5684012A JP 16032379 A JP16032379 A JP 16032379A JP 16032379 A JP16032379 A JP 16032379A JP S5684012 A JPS5684012 A JP S5684012A
Authority
JP
Japan
Prior art keywords
circuit
gain
voltage
agc
control
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
JP16032379A
Other languages
Japanese (ja)
Inventor
Takeshi Wada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16032379A priority Critical patent/JPS5684012A/en
Publication of JPS5684012A publication Critical patent/JPS5684012A/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
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a delayed AGC circuit by receiving an AGC voltage by an emitter follower and by exercising gain control by the output of a voltage dividing circuit provided at its emitter successively from the poststage circuit. CONSTITUTION:The output of detecting circuit 3 is converted into a direct current by resistance R3 and capacitor C1 to obtain AGC voltage VAGC. Then, VAGC is applied to transistor Q14 and from its emitter, VAGC1 and voltage-divided VAGC2 are obtained. Next, VAGC1 is applied to intermediate frequency amplifying circuit 2 to control its gain and VAGC2, on the other hand, is applied to frequency converting circuit 1 to control its gain. Namely, the gain of intermediate frequency amplifying circuit 2 is decreased according to a rise in AGC voltage and when the AGC voltage rises more, the gain of frequency converting circuit 1 lowers.
JP16032379A 1979-12-12 1979-12-12 Agc circuit Pending JPS5684012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16032379A JPS5684012A (en) 1979-12-12 1979-12-12 Agc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16032379A JPS5684012A (en) 1979-12-12 1979-12-12 Agc circuit

Publications (1)

Publication Number Publication Date
JPS5684012A true JPS5684012A (en) 1981-07-09

Family

ID=15712469

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16032379A Pending JPS5684012A (en) 1979-12-12 1979-12-12 Agc circuit

Country Status (1)

Country Link
JP (1) JPS5684012A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342671A2 (en) * 1988-05-20 1989-11-23 AT&E CORPORATION AGC delay on an integrated circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342671A2 (en) * 1988-05-20 1989-11-23 AT&E CORPORATION AGC delay on an integrated circuit
EP0342671A3 (en) * 1988-05-20 1991-03-06 AT&E CORPORATION Agc delay on an integrated circuit

Similar Documents

Publication Publication Date Title
JPS5421102A (en) Semiconductor device circuit
JPS5620314A (en) Electric power amplifier
JPS5684012A (en) Agc circuit
JPS5758414A (en) Analog-to-digital conversion circuit providing agc function
JPS5287346A (en) Amplifying circuit
JPS5627580A (en) Signal processor
JPS5658306A (en) Automatic gain control circuit
JPS5541012A (en) Gain control circuit
JPS56168427A (en) Analog-to-digital converter
JPS5442964A (en) Automatic gain control circuit
JPS5786917A (en) Direct-current stabilized power source device
JPS53148225A (en) Automatic gain control circuit
JPS54158208A (en) Auto-muting circuit
JPS5616311A (en) Transistor circuit
JPS51116963A (en) A.c. control circuit
JPS54555A (en) Automatic gain control unit
JPS5357952A (en) Gain control circuit
JPS53132752A (en) Constant current circuit
JPS6452396A (en) High frequency heating device
JPS5539456A (en) Pulse generation circuit
JPS54114158A (en) Automatic gain control circuit
JPS5440016A (en) Fail soft receiving high frequency amplifier
JPS5516563A (en) Stabilizer circuit for video output voltage
JPS5478059A (en) Gain control circuit
JPS54105419A (en) Squelch circuit