JPS555524A - Phase synchronism circuit - Google Patents

Phase synchronism circuit

Info

Publication number
JPS555524A
JPS555524A JP7807278A JP7807278A JPS555524A JP S555524 A JPS555524 A JP S555524A JP 7807278 A JP7807278 A JP 7807278A JP 7807278 A JP7807278 A JP 7807278A JP S555524 A JPS555524 A JP S555524A
Authority
JP
Japan
Prior art keywords
reference signal
frequency
signal
output
comparator
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
JP7807278A
Other languages
Japanese (ja)
Inventor
Hitoshi Ashida
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.)
Advantest Corp
Original Assignee
Advantest Corp
Takeda Riken Industries Co Ltd
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 Advantest Corp, Takeda Riken Industries Co Ltd filed Critical Advantest Corp
Priority to JP7807278A priority Critical patent/JPS555524A/en
Publication of JPS555524A publication Critical patent/JPS555524A/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 ensure the operation without out of synchronism, by returning the oscillating frequency to fine tuning range with coarse adjustment, when the frequency of reference signal is greatly changed and the phase difference between the outputs of the reference signal and the controlled oscillator is out of the fine tuning range. CONSTITUTION:When the frequency of reference signal of the oscillator R is greatly changed, the output in excess of the lower limit or upper limit from the phase comparator P is delivered. When it exceeds the upper limit comparison signal Th, the gate Gh is opened, the pulses are added to the counter N, the corresponding voltage is D/A converted to control the oscillator O, the frequency is greatly changed to reduce the phase difference with the reference signal and the output of the comparator P is less than the signal Th. Accordingly, the gate Gh is closed, the addition pulses are stopped, and the counter N keeps a given value. When the output of the comparator P is less than the lower limit signal Tl, the subtraction pulses are added to reduce the count value. Thus, no out of synchronism is caused between the reference signal R and the controlled oscillation O.
JP7807278A 1978-06-29 1978-06-29 Phase synchronism circuit Pending JPS555524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7807278A JPS555524A (en) 1978-06-29 1978-06-29 Phase synchronism circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7807278A JPS555524A (en) 1978-06-29 1978-06-29 Phase synchronism circuit

Publications (1)

Publication Number Publication Date
JPS555524A true JPS555524A (en) 1980-01-16

Family

ID=13651632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7807278A Pending JPS555524A (en) 1978-06-29 1978-06-29 Phase synchronism circuit

Country Status (1)

Country Link
JP (1) JPS555524A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143901A (en) * 1985-12-19 1987-06-27 Mitsui Toatsu Chem Inc Preparation of raw material for polymerization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143901A (en) * 1985-12-19 1987-06-27 Mitsui Toatsu Chem Inc Preparation of raw material for polymerization

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