FR2368178A1 - Phase locked loop circuit - has constant voltage added to error voltage and switchable capacitor connected to control input of VCO - Google Patents

Phase locked loop circuit - has constant voltage added to error voltage and switchable capacitor connected to control input of VCO

Info

Publication number
FR2368178A1
FR2368178A1 FR7631068A FR7631068A FR2368178A1 FR 2368178 A1 FR2368178 A1 FR 2368178A1 FR 7631068 A FR7631068 A FR 7631068A FR 7631068 A FR7631068 A FR 7631068A FR 2368178 A1 FR2368178 A1 FR 2368178A1
Authority
FR
France
Prior art keywords
vco
control input
locked loop
phase locked
loop circuit
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.)
Granted
Application number
FR7631068A
Other languages
French (fr)
Other versions
FR2368178B1 (en
Inventor
Jacques Couet
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7631068A priority Critical patent/FR2368178A1/en
Publication of FR2368178A1 publication Critical patent/FR2368178A1/en
Application granted granted Critical
Publication of FR2368178B1 publication Critical patent/FR2368178B1/fr
Granted 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
    • H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal

Landscapes

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

Abstract

The phase locked loop consists of a VCO (1) controlled by the output of a phase comparator (2). An adder (4) adds a constant DC voltage to the phase comparator's output error voltage and applies the sum to the VCO's control input via a resistor (31). The frequency control input of the VCO is also connected via a second resistor (32) to an earthed capacitor (33). The capacitor is shunted by a controlled discharging switch (37).
FR7631068A 1976-10-15 1976-10-15 Phase locked loop circuit - has constant voltage added to error voltage and switchable capacitor connected to control input of VCO Granted FR2368178A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7631068A FR2368178A1 (en) 1976-10-15 1976-10-15 Phase locked loop circuit - has constant voltage added to error voltage and switchable capacitor connected to control input of VCO

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7631068A FR2368178A1 (en) 1976-10-15 1976-10-15 Phase locked loop circuit - has constant voltage added to error voltage and switchable capacitor connected to control input of VCO

Publications (2)

Publication Number Publication Date
FR2368178A1 true FR2368178A1 (en) 1978-05-12
FR2368178B1 FR2368178B1 (en) 1980-10-10

Family

ID=9178805

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7631068A Granted FR2368178A1 (en) 1976-10-15 1976-10-15 Phase locked loop circuit - has constant voltage added to error voltage and switchable capacitor connected to control input of VCO

Country Status (1)

Country Link
FR (1) FR2368178A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492718A2 (en) * 1990-12-21 1992-07-01 MAGNAVOX ELECTRONIC SYSTEMS COMPANY (a Delaware corp.) Automatic sweep-to-lock circuit for a phase-locked loop
WO1998028851A1 (en) * 1996-12-24 1998-07-02 Samsung Electronics Co., Ltd. Device for synchronising a digital receiver

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492718A2 (en) * 1990-12-21 1992-07-01 MAGNAVOX ELECTRONIC SYSTEMS COMPANY (a Delaware corp.) Automatic sweep-to-lock circuit for a phase-locked loop
EP0492718A3 (en) * 1990-12-21 1992-11-25 Magnavox Electronic Systems Company (A Delaware Corp.) Automatic sweep-to-lock circuit for a phase-locked loop
WO1998028851A1 (en) * 1996-12-24 1998-07-02 Samsung Electronics Co., Ltd. Device for synchronising a digital receiver
US6008699A (en) * 1996-12-24 1999-12-28 Samsung Electronics Co., Ltd. Digital receiver locking device

Also Published As

Publication number Publication date
FR2368178B1 (en) 1980-10-10

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Legal Events

Date Code Title Description
ST Notification of lapse