JPS57196634A - Fm high frequency tuning circuit - Google Patents

Fm high frequency tuning circuit

Info

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
Application number
JP8326981A
Other languages
Japanese (ja)
Inventor
Tsuneaki Matoba
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8326981A priority Critical patent/JPS57196634A/en
Publication of JPS57196634A publication Critical patent/JPS57196634A/en
Pending legal-status Critical Current

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.
JP8326981A 1981-05-28 1981-05-28 Fm high frequency tuning circuit Pending JPS57196634A (en)

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)

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