JPS54111258A - Automatic gain controller - Google Patents

Automatic gain controller

Info

Publication number
JPS54111258A
JPS54111258A JP1837778A JP1837778A JPS54111258A JP S54111258 A JPS54111258 A JP S54111258A JP 1837778 A JP1837778 A JP 1837778A JP 1837778 A JP1837778 A JP 1837778A JP S54111258 A JPS54111258 A JP S54111258A
Authority
JP
Japan
Prior art keywords
amplification stage
gain control
voltage
diode
terminal
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
JP1837778A
Other languages
Japanese (ja)
Inventor
Takaoki Ooumaya
Yoshitada Himeno
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 JP1837778A priority Critical patent/JPS54111258A/en
Publication of JPS54111258A publication Critical patent/JPS54111258A/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 perform an automatic gain control only with the insertion of the parallel connection element of a diode and a resistance without a DC amplification stage or an adjusting variohm. CONSTITUTION:The generated voltage of AGC circuit 20 is supplied from terminal 19 to the first amplification stage 1 and the second amplification stage 2 through diode D25 and resistance R17 respectively. When +B voltage is supplied to terminal 19, diode D18 is turned on and D25 is turned off by resistances 17 and 26. The gain control characteristic of each amplification stage for the voltage of terminal 19 is changed by the parallel insertion of D25 and R26 as well as D18 and R17. Consequently, the gain control quantity, the output voltage, and the AGC voltage of the first and the second amplification stages show an approximately delayed AGC characteristic by the increment of the generated voltage of input terminal 3. Thus, the operation strat point of the high-frequency gain control stage is made earlier slightly, and the impedance change for IF of the diode is utilized, thereby controlling mainly the gain control of the second amplification stage and the first amplification stage in case of weak to middle voltages and middle to strong voltages respectively.
JP1837778A 1978-02-20 1978-02-20 Automatic gain controller Pending JPS54111258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1837778A JPS54111258A (en) 1978-02-20 1978-02-20 Automatic gain controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1837778A JPS54111258A (en) 1978-02-20 1978-02-20 Automatic gain controller

Publications (1)

Publication Number Publication Date
JPS54111258A true JPS54111258A (en) 1979-08-31

Family

ID=11970015

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1837778A Pending JPS54111258A (en) 1978-02-20 1978-02-20 Automatic gain controller

Country Status (1)

Country Link
JP (1) JPS54111258A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19653558C2 (en) * 1995-12-22 2002-09-19 Alps Electric Co Ltd Circuit for delayed automatic gain control

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5057526A (en) * 1973-09-20 1975-05-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5057526A (en) * 1973-09-20 1975-05-20

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19653558C2 (en) * 1995-12-22 2002-09-19 Alps Electric Co Ltd Circuit for delayed automatic gain control

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