JPS5564409A - Agc circuit of receiver - Google Patents

Agc circuit of receiver

Info

Publication number
JPS5564409A
JPS5564409A JP13855978A JP13855978A JPS5564409A JP S5564409 A JPS5564409 A JP S5564409A JP 13855978 A JP13855978 A JP 13855978A JP 13855978 A JP13855978 A JP 13855978A JP S5564409 A JPS5564409 A JP S5564409A
Authority
JP
Japan
Prior art keywords
circuit
amplifier circuit
negative feedback
diode
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.)
Pending
Application number
JP13855978A
Other languages
Japanese (ja)
Inventor
Yoshihiko Hirayama
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments and Electronics 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 Seiko Instruments and Electronics Ltd filed Critical Seiko Instruments and Electronics Ltd
Priority to JP13855978A priority Critical patent/JPS5564409A/en
Publication of JPS5564409A publication Critical patent/JPS5564409A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To increase apparent sensitivity by decreasing the lowest intensity of an operation electric field by automatically changing gains of an AGC amplifier circuit over by using a diode in a negative feedback circuit. CONSTITUTION:A high frequency signal from an antenna is selected by tuning circuit 1 and converted by mixing oscillation circuit 2 into an intermediate frequency signal, which is amplified by intermediate frequency amplifier circuit 3 and then detected by detection circuit 4. Its detection output is amplified by sound signal amplifier circuit 13 and its alternating-current component is led out from sound signal output terminal 6. The direct-current component, on the other hand, is imputted to AGC amplifier circuit 9 by way of sound-signal removing filter 7. Through the operation of negative feedback circuit 12, AGC amplifier circuit 9 allows output voltage Vin and voltage VAGC of AGC line 8 to bear non-linearity. Namely, when VAGC is high, diode 10 and Zener diode 11 conduct to provide much negative feedback and when Vin is high, only a little negative feedback is provided to the contrary.
JP13855978A 1978-11-10 1978-11-10 Agc circuit of receiver Pending JPS5564409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13855978A JPS5564409A (en) 1978-11-10 1978-11-10 Agc circuit of receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13855978A JPS5564409A (en) 1978-11-10 1978-11-10 Agc circuit of receiver

Publications (1)

Publication Number Publication Date
JPS5564409A true JPS5564409A (en) 1980-05-15

Family

ID=15224964

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13855978A Pending JPS5564409A (en) 1978-11-10 1978-11-10 Agc circuit of receiver

Country Status (1)

Country Link
JP (1) JPS5564409A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5990746A (en) * 1996-09-12 1999-11-23 Nokia Mobile Phones Limited Amplifier system
US9127574B2 (en) 2011-09-07 2015-09-08 Alstom Technology Ltd. Method for operating a power plant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5990746A (en) * 1996-09-12 1999-11-23 Nokia Mobile Phones Limited Amplifier system
US9127574B2 (en) 2011-09-07 2015-09-08 Alstom Technology Ltd. Method for operating a power plant

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