JPS57171844A - Phase detecting circuit in phase locked loop - Google Patents

Phase detecting circuit in phase locked loop

Info

Publication number
JPS57171844A
JPS57171844A JP56057660A JP5766081A JPS57171844A JP S57171844 A JPS57171844 A JP S57171844A JP 56057660 A JP56057660 A JP 56057660A JP 5766081 A JP5766081 A JP 5766081A JP S57171844 A JPS57171844 A JP S57171844A
Authority
JP
Japan
Prior art keywords
circuit
signal
phase
delaying
output
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
JP56057660A
Other languages
Japanese (ja)
Inventor
Haruo Arai
Atsuhisa Takahashi
Yoshio Morita
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56057660A priority Critical patent/JPS57171844A/en
Publication of JPS57171844A publication Critical patent/JPS57171844A/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
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/095—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using a lock detector

Landscapes

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

Abstract

PURPOSE:To prevent erroneous generation of a phase detecting signal, by constituting so that one input signal has wider pulse width than that of the other, between 2 input signals supplied to a phase comparator provided in a phase locked loop. CONSTITUTION:A delaying circuit 10 obtains a reference signal fi' by delaying an input signal fi by a prescribed time. On the other hand, a comparing signal fo' is obtained by providing a delaying circuit 11 for delaying an input signal fo inputted to a phase comparator 2 from a voltage control oscillating circuit 4, by a time decided in advance, and taking OR of an output signal of the circuit 11 and the signal fo by an OR circuit 12. Subsequently, the output of the circuit 12 is converted as to its polarity by an invertor 13, NOT OR of each output signal of the invertor 13 and the circuit 10 is taken by an NAND circuit 14, and a phase detecting signal is outputted to an output terminal 15 from the circuit 14. In this case, a phase difference is detected by making phase of the input signals fi, fo have a tolerance.
JP56057660A 1981-04-16 1981-04-16 Phase detecting circuit in phase locked loop Pending JPS57171844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56057660A JPS57171844A (en) 1981-04-16 1981-04-16 Phase detecting circuit in phase locked loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56057660A JPS57171844A (en) 1981-04-16 1981-04-16 Phase detecting circuit in phase locked loop

Publications (1)

Publication Number Publication Date
JPS57171844A true JPS57171844A (en) 1982-10-22

Family

ID=13062047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56057660A Pending JPS57171844A (en) 1981-04-16 1981-04-16 Phase detecting circuit in phase locked loop

Country Status (1)

Country Link
JP (1) JPS57171844A (en)

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