JPS5564409A - Agc circuit of receiver - Google Patents
Agc circuit of receiverInfo
- 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
Links
- 230000005236 sound signal Effects 0.000 abstract 3
- 238000001514 detection method Methods 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
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.
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)
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 |
-
1978
- 1978-11-10 JP JP13855978A patent/JPS5564409A/en active Pending
Cited By (2)
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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