JPS5741042A - Phase lock loop circuit - Google Patents

Phase lock loop circuit

Info

Publication number
JPS5741042A
JPS5741042A JP55117401A JP11740180A JPS5741042A JP S5741042 A JPS5741042 A JP S5741042A JP 55117401 A JP55117401 A JP 55117401A JP 11740180 A JP11740180 A JP 11740180A JP S5741042 A JPS5741042 A JP S5741042A
Authority
JP
Japan
Prior art keywords
vco3
input signal
voltage
output
loop circuit
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
JP55117401A
Other languages
Japanese (ja)
Inventor
Yoshinari Masumoto
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 JP55117401A priority Critical patent/JPS5741042A/en
Publication of JPS5741042A publication Critical patent/JPS5741042A/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
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/104—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional signal from outside the loop for setting or controlling a parameter in the loop

Landscapes

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

Abstract

PURPOSE:To shorten a leading-in time, by measuring a period of an input signal when an operation is started, converting this measuring signal to DC, and applying it to a voltage control oscillator VCO. CONSTITUTION:When an operation is started, a counter 7 counts an interval of an input signal by a clock from a clock terminal 10. An output of the counter 7 is provided to a holding circuit 9 is converted to DC voltage and is held. This DC voltage is applied to a VCO3, and also the VCO3 is reset by a controlling circuit for presetting 6. Voltage which is applied to the VCO3 by the next input signal is changed over to an output of a low-pass filter 2 by a switching circuit 5. That s to say, since the output of the VCO3 almost coincides with the input signal in advance, it attains to a lock state in a short time.
JP55117401A 1980-08-26 1980-08-26 Phase lock loop circuit Pending JPS5741042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55117401A JPS5741042A (en) 1980-08-26 1980-08-26 Phase lock loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55117401A JPS5741042A (en) 1980-08-26 1980-08-26 Phase lock loop circuit

Publications (1)

Publication Number Publication Date
JPS5741042A true JPS5741042A (en) 1982-03-06

Family

ID=14710729

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55117401A Pending JPS5741042A (en) 1980-08-26 1980-08-26 Phase lock loop circuit

Country Status (1)

Country Link
JP (1) JPS5741042A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6340212A (en) * 1986-08-06 1988-02-20 アルプス電気株式会社 Dielectric ceramic composition for microwave

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6340212A (en) * 1986-08-06 1988-02-20 アルプス電気株式会社 Dielectric ceramic composition for microwave

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