JPS5520068A - Automatic frequency control circuit featuring wide response band - Google Patents

Automatic frequency control circuit featuring wide response band

Info

Publication number
JPS5520068A
JPS5520068A JP9345778A JP9345778A JPS5520068A JP S5520068 A JPS5520068 A JP S5520068A JP 9345778 A JP9345778 A JP 9345778A JP 9345778 A JP9345778 A JP 9345778A JP S5520068 A JPS5520068 A JP S5520068A
Authority
JP
Japan
Prior art keywords
phase
frequency
signal
reference signal
standard
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
JP9345778A
Other languages
Japanese (ja)
Inventor
Masahiro Sato
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.)
Kokusai Denki Electric Inc
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP9345778A priority Critical patent/JPS5520068A/en
Publication of JPS5520068A publication Critical patent/JPS5520068A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To increase the pull-in frequency by detecting the fact that the phase synchronization becomes impossible between the input reference signal of the 1st phase comparator and the standard signal and then comparing the control input of the voltage control oscillator with the detection output for output of the control input. CONSTITUTION:Variable frequency oscillator VCO is controlled by the phase difference of the signals between the reference frequency extracted from BPF and the standard frequency. Narrow-band BPF1 extracts the reference signals to give a phase comparison at phase comparator PDT1 between the reference signal and the standard signal. While phase comparator PDT2 gives a phase comparison between the reference signal given from filter BPF2 and the standard signal. Then asynchronization detector USD detects that the phase synchronization becomes impossible between the input reference signal of PDT1 and the standard signal. With this detection output, the control input of VCO is switched SW to the output of the comparator. As a result, the pull-in frequency band can be increased.
JP9345778A 1978-07-31 1978-07-31 Automatic frequency control circuit featuring wide response band Pending JPS5520068A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9345778A JPS5520068A (en) 1978-07-31 1978-07-31 Automatic frequency control circuit featuring wide response band

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9345778A JPS5520068A (en) 1978-07-31 1978-07-31 Automatic frequency control circuit featuring wide response band

Publications (1)

Publication Number Publication Date
JPS5520068A true JPS5520068A (en) 1980-02-13

Family

ID=14082850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9345778A Pending JPS5520068A (en) 1978-07-31 1978-07-31 Automatic frequency control circuit featuring wide response band

Country Status (1)

Country Link
JP (1) JPS5520068A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60157335A (en) * 1984-01-09 1985-08-17 Yokogawa Hewlett Packard Ltd Frequency converting circuit
JPS63100820A (en) * 1986-10-16 1988-05-02 Nec Corp Automatic frequency control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60157335A (en) * 1984-01-09 1985-08-17 Yokogawa Hewlett Packard Ltd Frequency converting circuit
JPS63100820A (en) * 1986-10-16 1988-05-02 Nec Corp Automatic frequency control circuit

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