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JPS55141832A - Phase synchronous circuit - Google Patents

Phase synchronous circuit

Info

Publication number
JPS55141832A
JPS55141832A JP5069679A JP5069679A JPS55141832A JP S55141832 A JPS55141832 A JP S55141832A JP 5069679 A JP5069679 A JP 5069679A JP 5069679 A JP5069679 A JP 5069679A JP S55141832 A JPS55141832 A JP S55141832A
Authority
JP
Japan
Prior art keywords
time constant
switch
capacitor
active filter
switching
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
JP5069679A
Other languages
Japanese (ja)
Inventor
Takayuki Ogura
Kenzo Nakabashi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5069679A priority Critical patent/JPS55141832A/en
Publication of JPS55141832A publication Critical patent/JPS55141832A/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
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
    • H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth

Landscapes

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

Abstract

PURPOSE:To switch the time constant without causing out of synchronism by the switching of one change-over switch, by using the active filter which independently sets the specific frequency and the damping factor. CONSTITUTION:The phase synchronous circuit PLL consists of the phase comparator PC1, voltage controlled oscillator VC06, and 1/N frequency divider 7. The active filter 15 is inserted between the phase comparator 1 thus constituted and the VCO6. The active filter 15 consists of the amplifier 5, parallel feedback resistances 3, 13, series input resistances 2, 12, switch 11 to switch the resistance value, and capacitor 4. Further, the out of synchronism at time constant switching can be avoided, by simultaneously switching the time constant determined with the parallel feedback resistance of the amplifier 5 of PLL and the capacitor is series with it, and the time constant determined with the series input resistor and the capacitor.
JP5069679A 1979-04-24 1979-04-24 Phase synchronous circuit Pending JPS55141832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5069679A JPS55141832A (en) 1979-04-24 1979-04-24 Phase synchronous circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5069679A JPS55141832A (en) 1979-04-24 1979-04-24 Phase synchronous circuit

Publications (1)

Publication Number Publication Date
JPS55141832A true JPS55141832A (en) 1980-11-06

Family

ID=12866074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5069679A Pending JPS55141832A (en) 1979-04-24 1979-04-24 Phase synchronous circuit

Country Status (1)

Country Link
JP (1) JPS55141832A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62172819A (en) * 1986-01-27 1987-07-29 Nec Corp Phase synchronizing circuit
JPS6382084A (en) * 1986-09-25 1988-04-12 Fujitsu Ltd Oscillation system for highly stable reference frequency

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62172819A (en) * 1986-01-27 1987-07-29 Nec Corp Phase synchronizing circuit
JPS6382084A (en) * 1986-09-25 1988-04-12 Fujitsu Ltd Oscillation system for highly stable reference frequency

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