JPS5530300A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5530300A
JPS5530300A JP11042479A JP11042479A JPS5530300A JP S5530300 A JPS5530300 A JP S5530300A JP 11042479 A JP11042479 A JP 11042479A JP 11042479 A JP11042479 A JP 11042479A JP S5530300 A JPS5530300 A JP S5530300A
Authority
JP
Japan
Prior art keywords
gain
control circuit
gain control
wave intensity
agc
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
JP11042479A
Other languages
Japanese (ja)
Other versions
JPS6154288B2 (en
Inventor
Masanori Ienaka
Yasuo Kominami
Yukiro Suzuki
Masami Kawamura
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 JP11042479A priority Critical patent/JPS5530300A/en
Publication of JPS5530300A publication Critical patent/JPS5530300A/en
Publication of JPS6154288B2 publication Critical patent/JPS6154288B2/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
    • 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 RF amplifier circuit high in practical sensitivity by controlling gains of two RF amplification stages. CONSTITUTION:When the received radio wave intensity of a desired signal increases, detection output signal 19 of voltage comparator 17 is applied to AGC filter 14, where it is smoothed, and its output is passed through an ordianry AGC paht to decrease the gain of the 1st intermediate frequency amplification stage 6 first and when the received-wave intensity increases further, the gain of RF amplification stage 2 is decreased.
JP11042479A 1979-08-31 1979-08-31 Gain control circuit Granted JPS5530300A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11042479A JPS5530300A (en) 1979-08-31 1979-08-31 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11042479A JPS5530300A (en) 1979-08-31 1979-08-31 Gain control circuit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP11278674A Division JPS5345250B2 (en) 1974-10-02 1974-10-02

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP16034083A Division JPS5972236A (en) 1983-09-02 1983-09-02 Receiver

Publications (2)

Publication Number Publication Date
JPS5530300A true JPS5530300A (en) 1980-03-04
JPS6154288B2 JPS6154288B2 (en) 1986-11-21

Family

ID=14535400

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11042479A Granted JPS5530300A (en) 1979-08-31 1979-08-31 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5530300A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58201415A (en) * 1982-05-20 1983-11-24 Akai Electric Co Ltd Agc circuit of receiver
JPS5944824A (en) * 1982-08-02 1984-03-13 フエアチアイルド・カメラ・アンド・インストルメント・コ−ポレ−シヨン Lift off method of foring self-aligning contact

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS491124A (en) * 1972-04-15 1974-01-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS491124A (en) * 1972-04-15 1974-01-08

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58201415A (en) * 1982-05-20 1983-11-24 Akai Electric Co Ltd Agc circuit of receiver
JPS5944824A (en) * 1982-08-02 1984-03-13 フエアチアイルド・カメラ・アンド・インストルメント・コ−ポレ−シヨン Lift off method of foring self-aligning contact

Also Published As

Publication number Publication date
JPS6154288B2 (en) 1986-11-21

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