Nothing Special   »   [go: up one dir, main page]

GB1100805A - Improvements in or relating to oscillation generator arrangements - Google Patents

Improvements in or relating to oscillation generator arrangements

Info

Publication number
GB1100805A
GB1100805A GB17313/65A GB1731365A GB1100805A GB 1100805 A GB1100805 A GB 1100805A GB 17313/65 A GB17313/65 A GB 17313/65A GB 1731365 A GB1731365 A GB 1731365A GB 1100805 A GB1100805 A GB 1100805A
Authority
GB
United Kingdom
Prior art keywords
oscillator
diodes
reference frequency
frequency
tune
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.)
Expired
Application number
GB17313/65A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1100805A publication Critical patent/GB1100805A/en
Expired 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
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • H03L7/187—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number using means for coarse tuning the voltage controlled oscillator of the loop
    • 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

1,100,805. Automatic frequency control systems. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 23 April, 1965 [8 May, 1964], No. 17313/65. Heading H3A. A system wherein an oscillator (1, Fig. 1, not shown) is synchronized with a reference frequency (3) by a phase discriminator (4) is characterized in that the output of the discriminator passes through a two-stage RC filter (5) shown in Fig. 2, the resistance R2 of the second stage being shunted by a pair of oppositely poled diodes Dl and D2. When the oscillator is well off tune the diodes conduct and the system has a large capture range; when the oscillator is nearly in tune the diodes do not conduct and the filter provides the desired attenuation of the reference frequency. The oscillator (1) may be provided with coarse tuning means and feed a frequency divider (2), the tuning control being ganged to a control of the division ratio so that the output of the divider (2) which is fed to the phase discriminator is always approximately equal to the reference frequency.
GB17313/65A 1964-05-08 1965-04-23 Improvements in or relating to oscillation generator arrangements Expired GB1100805A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET0026152 1964-05-08

Publications (1)

Publication Number Publication Date
GB1100805A true GB1100805A (en) 1968-01-24

Family

ID=7552581

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17313/65A Expired GB1100805A (en) 1964-05-08 1965-04-23 Improvements in or relating to oscillation generator arrangements

Country Status (1)

Country Link
GB (1) GB1100805A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471703A1 (en) * 1979-12-10 1981-06-19 Sony Corp LOOP CIRCUIT LOCKED IN PHASE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471703A1 (en) * 1979-12-10 1981-06-19 Sony Corp LOOP CIRCUIT LOCKED IN PHASE

Similar Documents

Publication Publication Date Title
US3163823A (en) Digital receiver tuning system
GB1325219A (en) Variable frequency oscillator systems
GB1098119A (en) Transceiver with self-tuning transmitter controlled by receiver
GB1272447A (en) Automatic frequency control
GB1186907A (en) Improvements in or relating to Colour Television Receivers
GB1190459A (en) A Circuit Arrangement for Automatically Tuning a Communication Apparatus.
US2956239A (en) Phase lock system
GB1421093A (en) Frequency discriminator circuit arrangement
GB1019336A (en) Self-tuning radio receivers
GB1173203A (en) Improvements in or relating to Variable Frequency Crystal Stabilised Signal Generators
GB1104956A (en) Fm demodulator system
GB1147362A (en) Phase locked crystal controlled voltage variable oscillator
GB1082735A (en) Fm demodulator system
GB1155371A (en) Frequency Divider
GB1100805A (en) Improvements in or relating to oscillation generator arrangements
GB1309339A (en) Television receiver
GB1389127A (en) Pulse generator for generating a pulse series stabilized on and incoming impulse series
GB1122299A (en) Universal frequency synthesizer
GB873161A (en) Improvements in or relating to video recording systems
GB1046700A (en) Improvements in or relating to automatic phase control circuits
GB1030476A (en) Improvements in or relating to electric automatic frequency control systems
GB1125916A (en) Improvements in or relating to frequency synthesisers
GB1265447A (en)
GB1192680A (en) Frequency Generator
GB1116947A (en) Improvements in or relating to oscillator generator arrangements