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JPS55117337A - Phase synchronous oscillator - Google Patents

Phase synchronous oscillator

Info

Publication number
JPS55117337A
JPS55117337A JP2417279A JP2417279A JPS55117337A JP S55117337 A JPS55117337 A JP S55117337A JP 2417279 A JP2417279 A JP 2417279A JP 2417279 A JP2417279 A JP 2417279A JP S55117337 A JPS55117337 A JP S55117337A
Authority
JP
Japan
Prior art keywords
input
phase
comparison
lead
comparator
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
JP2417279A
Other languages
Japanese (ja)
Inventor
Takashi Shinozuka
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 JP2417279A priority Critical patent/JPS55117337A/en
Publication of JPS55117337A publication Critical patent/JPS55117337A/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
    • H03L7/101—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop
    • H03L7/102—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop the additional signal being directly applied to the controlled loop oscillator

Landscapes

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

Abstract

PURPOSE:To accelerate the synchronous lead-in and thus shorten the phase lead-in time by giving the control to the control circuit of the phase comparator of the sequence circuit type with the initial state setting signal which is set by the present reference input and the comparison input and irrespective of the past reference input and the comparison input. CONSTITUTION:The signal is supplied to input 1 of the phase synchronous oscillator, and the comparison is given to the phase difference between comparison input 9 and reference input 3 from dividers 2 and 8 through phase comparator 40 incorporating the sequence circuit. Then synchronous lead-in control circuit 11 operates when comparison output 5 exceeds the prescribed level to send out initial state setting signal 12 to dividers 2 and 8 as well as comparator 40. And dividers 2 and 8 are set to the initial state each, and at the same time the logic is set to 0 for the input end of comparator 40. Then voltage control variable oscillator 7 is controlled by the phase difference between the present reference input 3 and comparison input 9 and irrespective of the past inputs 3 and 9. As a result, the synchronous lead-in can be accelerated to shorten the phase lead-in time.
JP2417279A 1979-03-02 1979-03-02 Phase synchronous oscillator Pending JPS55117337A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2417279A JPS55117337A (en) 1979-03-02 1979-03-02 Phase synchronous oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2417279A JPS55117337A (en) 1979-03-02 1979-03-02 Phase synchronous oscillator

Publications (1)

Publication Number Publication Date
JPS55117337A true JPS55117337A (en) 1980-09-09

Family

ID=12130922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2417279A Pending JPS55117337A (en) 1979-03-02 1979-03-02 Phase synchronous oscillator

Country Status (1)

Country Link
JP (1) JPS55117337A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61196619A (en) * 1985-02-27 1986-08-30 Hitachi Ltd Phase pull-in circuit
JPS61258529A (en) * 1985-05-13 1986-11-15 Nec Corp Frequency synthesizer
JPS63131618A (en) * 1986-11-20 1988-06-03 Matsushita Electric Ind Co Ltd Frequency synthesizer
JPH06197015A (en) * 1992-12-24 1994-07-15 Canon Inc Frequency oscillator, period error detector, filter, signal deciding device and doppler velocity meter using them

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61196619A (en) * 1985-02-27 1986-08-30 Hitachi Ltd Phase pull-in circuit
JPS61258529A (en) * 1985-05-13 1986-11-15 Nec Corp Frequency synthesizer
JPS63131618A (en) * 1986-11-20 1988-06-03 Matsushita Electric Ind Co Ltd Frequency synthesizer
JPH06197015A (en) * 1992-12-24 1994-07-15 Canon Inc Frequency oscillator, period error detector, filter, signal deciding device and doppler velocity meter using them

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