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JPS56132015A - Frequency tuning circuit - Google Patents

Frequency tuning circuit

Info

Publication number
JPS56132015A
JPS56132015A JP3513780A JP3513780A JPS56132015A JP S56132015 A JPS56132015 A JP S56132015A JP 3513780 A JP3513780 A JP 3513780A JP 3513780 A JP3513780 A JP 3513780A JP S56132015 A JPS56132015 A JP S56132015A
Authority
JP
Japan
Prior art keywords
voltage
aft
frequency tuning
prescribed
tuning circuit
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.)
Granted
Application number
JP3513780A
Other languages
Japanese (ja)
Other versions
JPS6115621B2 (en
Inventor
Koichi Matsuda
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP3513780A priority Critical patent/JPS56132015A/en
Publication of JPS56132015A publication Critical patent/JPS56132015A/en
Publication of JPS6115621B2 publication Critical patent/JPS6115621B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To prevent the tuning circuit from exceeding the lock in range for a prescribed channel, by suppressing the automatic frequency tuning voltage at the no- signal time. CONSTITUTION:Frequency discriminator 13 outputs the automatic frequency tuning voltage (AFT voltage) from terminals 13a and 13b differentially. The correcting means consisting of diode D and Zener diode Z is provided between terminals 13a and 13b. AFT output SA' is clipped only in the positive direction with a prescribed level by this correcting means. Consequently, since the AFT voltage at the no-signal is suppressed within a prescribed voltage, the AFT voltage is set within the lock in range even if the receiving signal is restored after temporary break, and thus, stable receiving is continued.
JP3513780A 1980-03-19 1980-03-19 Frequency tuning circuit Granted JPS56132015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3513780A JPS56132015A (en) 1980-03-19 1980-03-19 Frequency tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3513780A JPS56132015A (en) 1980-03-19 1980-03-19 Frequency tuning circuit

Publications (2)

Publication Number Publication Date
JPS56132015A true JPS56132015A (en) 1981-10-16
JPS6115621B2 JPS6115621B2 (en) 1986-04-25

Family

ID=12433521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3513780A Granted JPS56132015A (en) 1980-03-19 1980-03-19 Frequency tuning circuit

Country Status (1)

Country Link
JP (1) JPS56132015A (en)

Also Published As

Publication number Publication date
JPS6115621B2 (en) 1986-04-25

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