JPS57196634A - Fm high frequency tuning circuit - Google Patents
Fm high frequency tuning circuitInfo
- Publication number
- JPS57196634A JPS57196634A JP8326981A JP8326981A JPS57196634A JP S57196634 A JPS57196634 A JP S57196634A JP 8326981 A JP8326981 A JP 8326981A JP 8326981 A JP8326981 A JP 8326981A JP S57196634 A JPS57196634 A JP S57196634A
- Authority
- JP
- Japan
- Prior art keywords
- tuning circuit
- level detector
- capacitor
- voltage
- increased
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/24—Automatic control in frequency-selective amplifiers
Landscapes
- Noise Elimination (AREA)
Abstract
PURPOSE:To prevent cross modulation and intermodulation due to an interference wave, by using a varactor diode as an input coupling capacitance connected to a tuning circuit and controlling the capacitor with a voltage proportional to a received electric field strength. CONSTITUTION:An input applied to an antenna input terminal 1 is given to a tuning coil 3 via a DC-cut capacitor 27 and a varactor diode 28. On the other hand, a broad band AGC voltage from a level detector 24 is applied to a connection point with the capacitor 27 as a control voltage for the level detector 24 via a resistor 18. As the output voltage of the level detector 24 increases, the capacitance of the varactoradiode 28 is reduced, the Q of the tuning circuit is increased and the pass band characteristics can be narrowed. Thus, the attenuation of the interference wave is increased to a desire signal, allowing to improve the cross modulation and intermodulation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8326981A JPS57196634A (en) | 1981-05-28 | 1981-05-28 | Fm high frequency tuning circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8326981A JPS57196634A (en) | 1981-05-28 | 1981-05-28 | Fm high frequency tuning circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57196634A true JPS57196634A (en) | 1982-12-02 |
Family
ID=13797631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8326981A Pending JPS57196634A (en) | 1981-05-28 | 1981-05-28 | Fm high frequency tuning circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57196634A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0242444A2 (en) * | 1986-04-17 | 1987-10-28 | Robert Bosch Gmbh | Mobile radio receiver |
-
1981
- 1981-05-28 JP JP8326981A patent/JPS57196634A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0242444A2 (en) * | 1986-04-17 | 1987-10-28 | Robert Bosch Gmbh | Mobile radio receiver |
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