JPS57124921A - Automatic frequency controlling circuit - Google Patents

Automatic frequency controlling circuit

Info

Publication number
JPS57124921A
JPS57124921A JP1099281A JP1099281A JPS57124921A JP S57124921 A JPS57124921 A JP S57124921A JP 1099281 A JP1099281 A JP 1099281A JP 1099281 A JP1099281 A JP 1099281A JP S57124921 A JPS57124921 A JP S57124921A
Authority
JP
Japan
Prior art keywords
frequency
output
crystal control
control oscillator
afc
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
JP1099281A
Other languages
Japanese (ja)
Inventor
Yoshio Nomachi
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 JP1099281A priority Critical patent/JPS57124921A/en
Publication of JPS57124921A publication Critical patent/JPS57124921A/en
Pending 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
    • H03J7/06—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 counters or frequency dividers
    • H03J7/065—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 counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To enable wider sweeping without losing the stability of a crystal control oscillator, by adding a frequency synthesizer taking a signal of a crystal control oscillator as the 2nd reference signal. CONSTITUTION:An output of a crystal control oscillator VCXO15 is mixed with a frequency of a crystal control oscillator XOSC16 for frequency shift at a mixer 17 and frequency-shifted and applied to a phase comparator 18. An output of a voltage controlled oscillator VCO20 is frequency-divided at a frequency multipler 25 and a variable counter 22 to form a signal 24 and phase comparison is made by the phase comparator 18. This AFC circuit keeps the error in frequency of the output 2 to zero even if a frequency f1 has a drift of + or -DELTAf, and if no lock is detected by a lock detector 12, the frequency dividing ratio of a variable counter 22 is extended so that the drift of the output 2 is kept within the AFC, allowing to increase the lock range of AFC.
JP1099281A 1981-01-26 1981-01-26 Automatic frequency controlling circuit Pending JPS57124921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1099281A JPS57124921A (en) 1981-01-26 1981-01-26 Automatic frequency controlling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1099281A JPS57124921A (en) 1981-01-26 1981-01-26 Automatic frequency controlling circuit

Publications (1)

Publication Number Publication Date
JPS57124921A true JPS57124921A (en) 1982-08-04

Family

ID=11765637

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1099281A Pending JPS57124921A (en) 1981-01-26 1981-01-26 Automatic frequency controlling circuit

Country Status (1)

Country Link
JP (1) JPS57124921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673495A1 (en) * 1991-02-28 1992-09-04 Alcatel Telspace FREQUENCY TRANSPOSITION DEVICE WITH AUTOMATIC FREQUENCY CONTROL.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673495A1 (en) * 1991-02-28 1992-09-04 Alcatel Telspace FREQUENCY TRANSPOSITION DEVICE WITH AUTOMATIC FREQUENCY CONTROL.

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