JPS5675728A - Detection circuit of digital pll lock state - Google Patents

Detection circuit of digital pll lock state

Info

Publication number
JPS5675728A
JPS5675728A JP15152779A JP15152779A JPS5675728A JP S5675728 A JPS5675728 A JP S5675728A JP 15152779 A JP15152779 A JP 15152779A JP 15152779 A JP15152779 A JP 15152779A JP S5675728 A JPS5675728 A JP S5675728A
Authority
JP
Japan
Prior art keywords
signal
circuit
lock state
kept
phase comparison
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
JP15152779A
Other languages
Japanese (ja)
Inventor
Chisafumi Haginaka
Tsuneo Shidara
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15152779A priority Critical patent/JPS5675728A/en
Publication of JPS5675728A publication Critical patent/JPS5675728A/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 simplify the circuit constitution, by receiving an arbitrary one wave out of n waves at all times with a digital PLL1 circuit and detecting which wave it is. CONSTITUTION:In a digital PLL circuit 1, if the frequency fi of an input signal (a) is varied, the phase of the negative feedback signal (e) and the signal (a) is shifted. Next, the pulse duty of a phase comparison signal (b) is changed and the gate switching time ratio by the gate circuit 3 is controlled. Further, the supply ratio (1-alpha): alpha of the oscillation signals (c) and (d) to a counter circuit 6 is changed and the lock state is kept by following to the change in the input frequency. A lock state detection circuit 7 compares the 1/2<n-1> signal (f) of the circuit 6 with the phase comparison signal (b) to output the lock state detection signal (l) by using the relation that the integration signal (j) integrating the phase comparison signal (i) when a given frequency relation is mutually kept, is less than the reference voltage signal (k). When the lock state is kept, the input signal (a) and the negative feedback signal (e) have a fixed phase difference.
JP15152779A 1979-11-22 1979-11-22 Detection circuit of digital pll lock state Pending JPS5675728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15152779A JPS5675728A (en) 1979-11-22 1979-11-22 Detection circuit of digital pll lock state

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15152779A JPS5675728A (en) 1979-11-22 1979-11-22 Detection circuit of digital pll lock state

Publications (1)

Publication Number Publication Date
JPS5675728A true JPS5675728A (en) 1981-06-23

Family

ID=15520457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15152779A Pending JPS5675728A (en) 1979-11-22 1979-11-22 Detection circuit of digital pll lock state

Country Status (1)

Country Link
JP (1) JPS5675728A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839122A (en) * 1981-08-31 1983-03-07 Fujitsu Ltd Detecting circuit for step-out of synchronism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839122A (en) * 1981-08-31 1983-03-07 Fujitsu Ltd Detecting circuit for step-out of synchronism

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