JPS5690632A - Detecting circuit for step-out of phase synchronizing circuit - Google Patents

Detecting circuit for step-out of phase synchronizing circuit

Info

Publication number
JPS5690632A
JPS5690632A JP16799179A JP16799179A JPS5690632A JP S5690632 A JPS5690632 A JP S5690632A JP 16799179 A JP16799179 A JP 16799179A JP 16799179 A JP16799179 A JP 16799179A JP S5690632 A JPS5690632 A JP S5690632A
Authority
JP
Japan
Prior art keywords
circuit
phase
out state
phase synchronizing
capacitor
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
JP16799179A
Other languages
Japanese (ja)
Inventor
Teruaki Emori
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 JP16799179A priority Critical patent/JPS5690632A/en
Publication of JPS5690632A publication Critical patent/JPS5690632A/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 make it possible to detect a step-out state even if it is remarkable, by integrating a phase error signal and then by recognizing the step-out state when the integral value surpasses a prescribed value. CONSTITUTION:Phase comparator 1, charge pump 2 and voltage control oscillator 3 constitute a phase synchronizing circuit, which is additionally provided with integrating circuit 4 as a step-out detecting circuit and level slicing circuit 5. As the phase synchronizing circuit gets out of synchronism, the number of output pulses from phase comparator 1 increases and the pulse width also increases. As a result, charges accumulated in capacitor 7 increses and the potential of capacitor 7 rises. Then, when the potential exceeds reference voltage 10, comparing circuit 9 generates an output. Thus, the step-out state can be detected.
JP16799179A 1979-12-24 1979-12-24 Detecting circuit for step-out of phase synchronizing circuit Pending JPS5690632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16799179A JPS5690632A (en) 1979-12-24 1979-12-24 Detecting circuit for step-out of phase synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16799179A JPS5690632A (en) 1979-12-24 1979-12-24 Detecting circuit for step-out of phase synchronizing circuit

Publications (1)

Publication Number Publication Date
JPS5690632A true JPS5690632A (en) 1981-07-22

Family

ID=15859766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16799179A Pending JPS5690632A (en) 1979-12-24 1979-12-24 Detecting circuit for step-out of phase synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS5690632A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61135228A (en) * 1984-12-06 1986-06-23 Matsushita Electric Ind Co Ltd Frequency variable oscillator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61135228A (en) * 1984-12-06 1986-06-23 Matsushita Electric Ind Co Ltd Frequency variable oscillator

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