JPS5568742A - Phase lock oscillator circuit - Google Patents

Phase lock oscillator circuit

Info

Publication number
JPS5568742A
JPS5568742A JP14237178A JP14237178A JPS5568742A JP S5568742 A JPS5568742 A JP S5568742A JP 14237178 A JP14237178 A JP 14237178A JP 14237178 A JP14237178 A JP 14237178A JP S5568742 A JPS5568742 A JP S5568742A
Authority
JP
Japan
Prior art keywords
output
precision
oscillator
frequency
voltage control
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
JP14237178A
Other languages
Japanese (ja)
Inventor
Kozo Kamata
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14237178A priority Critical patent/JPS5568742A/en
Publication of JPS5568742A publication Critical patent/JPS5568742A/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

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To secure generation of the high-precision frequency through the voltage control oscillator by dividing part of the outut of the voltage control oscillator in the fixed ratio to feed it back to the phase comparator to be compared with the external clock or the high-precision oscillation signal. CONSTITUTION:Input change-over switch 3 selects either the clock supplied from the higher-rank station or the output of incorporated high-precision oscillator 1. The selected clock or output is devided 4 into 1/N1 to be applied to phase comparator 5. The output of comparator 5 receives elimination of its high frequency via LPF6 and is then sent to voltage control oscillator 7 to be extracted with generation of the synchronized frequency. At the same time, part of the output is divided 8 into 1/N2 and then fed back to comparator 5 to be compared with the output of counter 4. As a result, oscillator 7 can generate the high-precision frequency.
JP14237178A 1978-11-20 1978-11-20 Phase lock oscillator circuit Pending JPS5568742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14237178A JPS5568742A (en) 1978-11-20 1978-11-20 Phase lock oscillator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14237178A JPS5568742A (en) 1978-11-20 1978-11-20 Phase lock oscillator circuit

Publications (1)

Publication Number Publication Date
JPS5568742A true JPS5568742A (en) 1980-05-23

Family

ID=15313820

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14237178A Pending JPS5568742A (en) 1978-11-20 1978-11-20 Phase lock oscillator circuit

Country Status (1)

Country Link
JP (1) JPS5568742A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62245819A (en) * 1986-04-18 1987-10-27 Mitsubishi Electric Corp Synchronizing circuit
US4802235A (en) * 1985-04-26 1989-01-31 Comven, Inc. Subscriber unit for a flexible communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4802235A (en) * 1985-04-26 1989-01-31 Comven, Inc. Subscriber unit for a flexible communication system
JPS62245819A (en) * 1986-04-18 1987-10-27 Mitsubishi Electric Corp Synchronizing circuit

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