JPS5838035A - Detection circuit for out-of-lock - Google Patents

Detection circuit for out-of-lock

Info

Publication number
JPS5838035A
JPS5838035A JP56134250A JP13425081A JPS5838035A JP S5838035 A JPS5838035 A JP S5838035A JP 56134250 A JP56134250 A JP 56134250A JP 13425081 A JP13425081 A JP 13425081A JP S5838035 A JPS5838035 A JP S5838035A
Authority
JP
Japan
Prior art keywords
circuit
output
frequency
division
lock
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
JP56134250A
Inventor
Masaaki Hata
Toyotaro Sawa
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP56134250A priority Critical patent/JPS5838035A/en
Publication of JPS5838035A publication Critical patent/JPS5838035A/en
Application status is Pending legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00Automatic control of frequency or phase; Synchronisation
    • H03L7/06Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08Details of the phase-locked loop
    • H03L7/085Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/095Details 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

Abstract

PURPOSE:To detect out-of-lock suitably, by providing two frequency dividers having the same frequency-division each for an output of a reference oscillator and a VCO of a PLL circuit including a phase modulator and giving the output to an EX-OR circuit. CONSTITUTION:Outputs of a reference oscillator 2 and a VCO5 of a PLL circuit 1 provided with a phase modulator 6 after a phase comparato 3, are provided with frequency dividers 21 and 22 having the same frequency-division M. The outputs of the frequency dividers 21 and 22 are inputted to an EX-OR circuit 7 and the output of the circuit 7 is inputted to a level discriminator 9 via an integration circuit 8. The slope of the output of the circuit 8 is mitigated in comparison with the absence of the frequency dividers and the fluctuation width of the output of the circuit 8 is decreased to 1/M with the M frequency-division. Thus, the threshold value of the circuit 9 discriminating out-of-lock can be set to the outside of range of fluctuation due to modulation. The suitable setting of frequency-division M prevents mis-detection of normal modulation as out-of-lock even with a large modulation index.
JP56134250A 1981-08-28 1981-08-28 Detection circuit for out-of-lock Pending JPS5838035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56134250A JPS5838035A (en) 1981-08-28 1981-08-28 Detection circuit for out-of-lock

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56134250A JPS5838035A (en) 1981-08-28 1981-08-28 Detection circuit for out-of-lock
CA000409992A CA1178346A (en) 1981-08-28 1982-08-24 Phase modulator with phase-unlocked state detecting function

Publications (1)

Publication Number Publication Date
JPS5838035A true JPS5838035A (en) 1983-03-05

Family

ID=15123899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56134250A Pending JPS5838035A (en) 1981-08-28 1981-08-28 Detection circuit for out-of-lock

Country Status (2)

Country Link
JP (1) JPS5838035A (en)
CA (1) CA1178346A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278079A2 (en) * 1987-02-11 1988-08-17 International Business Machines Corporation NRZ Phase-locked loop circuit with associated monitor and recovery circuitry
EP0735680A1 (en) * 1995-03-31 1996-10-02 Texas Instruments Deutschland Gmbh 2-Wire bus digital signal transmission receiver circuit
US6429901B1 (en) 1997-01-23 2002-08-06 Sanyo Electric Co., Ltd. PLL circuit and phase lock detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278079A2 (en) * 1987-02-11 1988-08-17 International Business Machines Corporation NRZ Phase-locked loop circuit with associated monitor and recovery circuitry
EP0735680A1 (en) * 1995-03-31 1996-10-02 Texas Instruments Deutschland Gmbh 2-Wire bus digital signal transmission receiver circuit
US6429901B1 (en) 1997-01-23 2002-08-06 Sanyo Electric Co., Ltd. PLL circuit and phase lock detector

Also Published As

Publication number Publication date
CA1178346A (en) 1984-11-20
CA1178346A1 (en)

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