JPS5498166A - Phase synchronizing oscillator - Google Patents

Phase synchronizing oscillator

Info

Publication number
JPS5498166A
JPS5498166A JP432478A JP432478A JPS5498166A JP S5498166 A JPS5498166 A JP S5498166A JP 432478 A JP432478 A JP 432478A JP 432478 A JP432478 A JP 432478A JP S5498166 A JPS5498166 A JP S5498166A
Authority
JP
Japan
Prior art keywords
signals
oscillator
analogue
circuit
broken
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
JP432478A
Other languages
Japanese (ja)
Inventor
Michio Takayama
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 JP432478A priority Critical patent/JPS5498166A/en
Publication of JPS5498166A publication Critical patent/JPS5498166A/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
    • H03L7/14—Details of the phase-locked loop for assuring constant frequency when supply or correction voltages fail
    • H03L7/146—Details of the phase-locked loop for assuring constant frequency when supply or correction voltages fail by using digital means for generating the oscillator control signal

Landscapes

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

Abstract

PURPOSE:To stabilize the operation of a phase synchronizing oscillator by providing a switch to control a voltage control oscillator by analogue signals in case that input signals exist and control the voltage control oscillator by regenerated analogue signals in case that input signals are broken. CONSTITUTION:Switch 20 which is switched by holding signals from terminal 19 is provided in the final control voltage line of a conventional circuit. That is, when input signals are broken and holding signals are inputted, held regenerated analogue signals which are the output of D/A converter 18 are connected to the input of voltage control oscillator 12; and when input signals are normally inputted and holding signals are broken, comparison is performed in 14 through DC amplifier 15 and LPF 16, and the output analogue signals are connected to oscillator. As a result, frequency shift can be restrained very low and the operation can be stabilized by this circuit constitution. Otherwise, this circuit may be constituted by an analogue signal comparator and an up/down counter in stead of A/D converter 17 which is a large-scale circuit.
JP432478A 1978-01-20 1978-01-20 Phase synchronizing oscillator Pending JPS5498166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP432478A JPS5498166A (en) 1978-01-20 1978-01-20 Phase synchronizing oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP432478A JPS5498166A (en) 1978-01-20 1978-01-20 Phase synchronizing oscillator

Publications (1)

Publication Number Publication Date
JPS5498166A true JPS5498166A (en) 1979-08-02

Family

ID=11581262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP432478A Pending JPS5498166A (en) 1978-01-20 1978-01-20 Phase synchronizing oscillator

Country Status (1)

Country Link
JP (1) JPS5498166A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176844A (en) * 1981-04-23 1982-10-30 Mitsubishi Electric Corp Phase synchronizing oscillator
JP2014518036A (en) * 2011-05-02 2014-07-24 日本テキサス・インスツルメンツ株式会社 Apparatus and method for maintaining PLL output frequency when input clock is lost
JP2015035764A (en) * 2013-08-09 2015-02-19 旭化成エレクトロニクス株式会社 Pll circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5199961A (en) * 1975-03-01 1976-09-03 Nippon Electric Co
JPS5260052A (en) * 1975-11-12 1977-05-18 Fujitsu Ltd Phase control circuit featuring self-run frequency setting medium
JPS5379454A (en) * 1976-12-24 1978-07-13 Fujitsu Ltd Phase control oscillator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5199961A (en) * 1975-03-01 1976-09-03 Nippon Electric Co
JPS5260052A (en) * 1975-11-12 1977-05-18 Fujitsu Ltd Phase control circuit featuring self-run frequency setting medium
JPS5379454A (en) * 1976-12-24 1978-07-13 Fujitsu Ltd Phase control oscillator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176844A (en) * 1981-04-23 1982-10-30 Mitsubishi Electric Corp Phase synchronizing oscillator
JP2014518036A (en) * 2011-05-02 2014-07-24 日本テキサス・インスツルメンツ株式会社 Apparatus and method for maintaining PLL output frequency when input clock is lost
JP2015035764A (en) * 2013-08-09 2015-02-19 旭化成エレクトロニクス株式会社 Pll circuit

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