JPS52124846A - Filter switch of digital phase synchronous oscillator - Google Patents

Filter switch of digital phase synchronous oscillator

Info

Publication number
JPS52124846A
JPS52124846A JP4145576A JP4145576A JPS52124846A JP S52124846 A JPS52124846 A JP S52124846A JP 4145576 A JP4145576 A JP 4145576A JP 4145576 A JP4145576 A JP 4145576A JP S52124846 A JPS52124846 A JP S52124846A
Authority
JP
Japan
Prior art keywords
digital phase
phase synchronous
filter switch
synchronous oscillator
oscillator
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
JP4145576A
Other languages
Japanese (ja)
Inventor
Kuninosuke Ihira
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 JP4145576A priority Critical patent/JPS52124846A/en
Publication of JPS52124846A publication Critical patent/JPS52124846A/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
    • 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
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
    • H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
    • H03L7/0893—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump the up-down pulses controlling at least two source current generators or at least two sink current generators connected to different points in the loop

Abstract

PURPOSE:To increase the response speed in case of the abrupt change of frequency and to enhance the stability otherwise by switching the time constant of lowpass filter.
JP4145576A 1976-04-12 1976-04-12 Filter switch of digital phase synchronous oscillator Pending JPS52124846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4145576A JPS52124846A (en) 1976-04-12 1976-04-12 Filter switch of digital phase synchronous oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4145576A JPS52124846A (en) 1976-04-12 1976-04-12 Filter switch of digital phase synchronous oscillator

Publications (1)

Publication Number Publication Date
JPS52124846A true JPS52124846A (en) 1977-10-20

Family

ID=12608837

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4145576A Pending JPS52124846A (en) 1976-04-12 1976-04-12 Filter switch of digital phase synchronous oscillator

Country Status (1)

Country Link
JP (1) JPS52124846A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695038A1 (en) * 1994-07-28 1996-01-31 Thomson Consumer Electronics, Inc. Fast acting control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695038A1 (en) * 1994-07-28 1996-01-31 Thomson Consumer Electronics, Inc. Fast acting control system
US5686866A (en) * 1994-07-28 1997-11-11 Thomson Consumer Electronics, Inc. Phase locked loop providing fast tuning for large frequency changes

Similar Documents

Publication Publication Date Title
JPS52127147A (en) Phase cynchronizing oscillator
JPS52124846A (en) Filter switch of digital phase synchronous oscillator
JPS5293258A (en) Phase syncronizing oscillator
JPS54850A (en) Digital afc circuit
JPS5354456A (en) Phase synchronizing oscillator
JPS52140219A (en) Tuner unit
JPS5333090A (en) Phase synchronizing oscillator
JPS51142252A (en) Exciter circuit
JPS52124847A (en) Charge pump circuit of digital phase synchronous oscillator
JPS5323257A (en) Phase difference detection circuit
JPS5367337A (en) Digital phase synchronous circuit
JPS5357731A (en) Voltage-contro-type oscillation circuit
JPS52123854A (en) Generator of variable frequency signal
JPS5333038A (en) Phase synchronizing oscillator
JPS5361953A (en) Channel dividing amplifier
JPS524153A (en) Pull-in circuit
JPS5346255A (en) Pll circuit
JPS52132760A (en) Pll circuit
JPS533361A (en) Displacement converter
JPS52144258A (en) Fm signal demodulation circuit
JPS5316563A (en) Atomic oscillator
JPS51147159A (en) Semiconductor direct oscillator
JPS52109358A (en) Variable frequency oscillator
JPS5321547A (en) Frequency dividing filter
JPS5394167A (en) Digital phase synchronous loop