JPS54140442A - Automatic sensitivity control circuit for receiver - Google Patents
Automatic sensitivity control circuit for receiverInfo
- Publication number
- JPS54140442A JPS54140442A JP4810178A JP4810178A JPS54140442A JP S54140442 A JPS54140442 A JP S54140442A JP 4810178 A JP4810178 A JP 4810178A JP 4810178 A JP4810178 A JP 4810178A JP S54140442 A JPS54140442 A JP S54140442A
- Authority
- JP
- Japan
- Prior art keywords
- sensitivity
- circuit
- amplified
- field intensity
- voltage
- 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
- 230000035945 sensitivity Effects 0.000 title abstract 6
- 238000001514 detection method Methods 0.000 abstract 2
- 239000000203 mixture Substances 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
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
PURPOSE:To increase the virtual sensitivity by lowering down the operation minimum field intensity of the automatic sensitivity control (AGC) characteristics for the reception circuit in the radio control unit or the like. CONSTITUTION:The higher frequency signals supplied through the antenna undergo the channel selection at tuning circuit 1, are amplified at higher frequency amplifier circuit 2, changed into the intermediate frequency through mixture oscillator circuit 3, amplified at IF amplifier circuit 4, detected through detection circuit 5, and then turned to the detection output including the voltage of the DC component and the voltage of the aural output component equivalent to the closed line of the intermediate frequency. The aural signal is amplified throught amplifier circuit 6 to drive the relay and others. On the other hand, the DC component is drawn out through low-pass filter 7 and then supplied to limiter 8. At limiter 8 the output to AGC line 10 is changed when the voltage becomes over the specified level. Thus the gain is reduced, resulting in reduction of the sensitivity. The field intensity with which the reduction of sensitivity begins is set larger than the operation minimum field intensity of the radio control unit, and thus the sensitivity can be increased to the faint electric wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4810178A JPS54140442A (en) | 1978-04-21 | 1978-04-21 | Automatic sensitivity control circuit for receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4810178A JPS54140442A (en) | 1978-04-21 | 1978-04-21 | Automatic sensitivity control circuit for receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54140442A true JPS54140442A (en) | 1979-10-31 |
Family
ID=12793918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4810178A Pending JPS54140442A (en) | 1978-04-21 | 1978-04-21 | Automatic sensitivity control circuit for receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54140442A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01208915A (en) * | 1988-02-16 | 1989-08-22 | Sanyo Electric Co Ltd | Fm receiver |
| JPH0248832A (en) * | 1987-05-23 | 1990-02-19 | Nec Corp | Antenna tuning circuit and individual selective call receiver using the same |
| US4972353A (en) * | 1989-02-21 | 1990-11-20 | Ford Motor Company | Radio-frequency transformer providing automatic gain control and overload protection |
| JPH0475438U (en) * | 1990-11-13 | 1992-07-01 | ||
| US5404589A (en) * | 1992-06-26 | 1995-04-04 | U.S. Philips Corporation | FM receiver with dynamic intermediate frequency (IF) filter tuning |
| WO2016047090A1 (en) * | 2014-09-26 | 2016-03-31 | Ｎｅｃスペーステクノロジー株式会社 | Output power control device |
-
1978
- 1978-04-21 JP JP4810178A patent/JPS54140442A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0248832A (en) * | 1987-05-23 | 1990-02-19 | Nec Corp | Antenna tuning circuit and individual selective call receiver using the same |
| JPH01208915A (en) * | 1988-02-16 | 1989-08-22 | Sanyo Electric Co Ltd | Fm receiver |
| US4972353A (en) * | 1989-02-21 | 1990-11-20 | Ford Motor Company | Radio-frequency transformer providing automatic gain control and overload protection |
| JPH0475438U (en) * | 1990-11-13 | 1992-07-01 | ||
| US5404589A (en) * | 1992-06-26 | 1995-04-04 | U.S. Philips Corporation | FM receiver with dynamic intermediate frequency (IF) filter tuning |
| WO2016047090A1 (en) * | 2014-09-26 | 2016-03-31 | Ｎｅｃスペーステクノロジー株式会社 | Output power control device |
| JPWO2016047090A1 (en) * | 2014-09-26 | 2017-06-22 | Ｎｅｃスペーステクノロジー株式会社 | Output power control device |
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