JPS57186839A - Phase synchronizing oscillating circuit - Google Patents

Phase synchronizing oscillating circuit

Info

Publication number
JPS57186839A
JPS57186839A JP56072525A JP7252581A JPS57186839A JP S57186839 A JPS57186839 A JP S57186839A JP 56072525 A JP56072525 A JP 56072525A JP 7252581 A JP7252581 A JP 7252581A JP S57186839 A JPS57186839 A JP S57186839A
Authority
JP
Japan
Prior art keywords
output
signal
circuit
vco4
phase
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
JP56072525A
Other languages
Japanese (ja)
Inventor
Hiroshi Muto
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 JP56072525A priority Critical patent/JPS57186839A/en
Publication of JPS57186839A publication Critical patent/JPS57186839A/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)

Abstract

PURPOSE:To prevent a phase skip of an output signal in case when a selecting circuit is being operated, and to obtain the output signal having a high quality, by constituting so that output signals of 2 voltage control oscillators, which are provided to the selecting circuit of the output signal are in coincidence. CONSTITUTION:A signal proportional to a phase difference of output signals of the first VCO4 and the second VCO40 is generated by the first phase comparator 1, an output of this comparator is supplied as an input of an LPF2, and also an output of signal of this LPF2 is supplied as an input of a switching circuit 53. Also, a signal proportional to a phase difference of the VCO4 and a reference input signal is outputted by the second phase comparator 10, its output is made an input of the second LPF20, and an output of the LPF20 is inputted to the circuit 53. Subsequently, when a selecting circuit 60 is selecting an output of the VCO4, an output signal of the LPF52 is applied to a voltage adding circuit 30 by the circuit 53, no output is provided to a voltage adding circuit 3, an output of the LPF2 is provided to the VCO4, a phase skip of an output signal in case when the circuit 60 is being operated is prevented, and a signal having a high quality is outputted to an output terminal 200.
JP56072525A 1981-05-14 1981-05-14 Phase synchronizing oscillating circuit Pending JPS57186839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072525A JPS57186839A (en) 1981-05-14 1981-05-14 Phase synchronizing oscillating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072525A JPS57186839A (en) 1981-05-14 1981-05-14 Phase synchronizing oscillating circuit

Publications (1)

Publication Number Publication Date
JPS57186839A true JPS57186839A (en) 1982-11-17

Family

ID=13491831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072525A Pending JPS57186839A (en) 1981-05-14 1981-05-14 Phase synchronizing oscillating circuit

Country Status (1)

Country Link
JP (1) JPS57186839A (en)

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