GB1521971A - Phase locked oscillators - Google Patents

Phase locked oscillators

Info

Publication number
GB1521971A
GB1521971A GB46744/74A GB4674474A GB1521971A GB 1521971 A GB1521971 A GB 1521971A GB 46744/74 A GB46744/74 A GB 46744/74A GB 4674474 A GB4674474 A GB 4674474A GB 1521971 A GB1521971 A GB 1521971A
Authority
GB
United Kingdom
Prior art keywords
oscillator
oscillators
signal
frequency
oct
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
GB46744/74A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB46744/74A priority Critical patent/GB1521971A/en
Priority to ZA00755928A priority patent/ZA755928B/en
Priority to NZ178918A priority patent/NZ178918A/en
Priority to IE2244/75A priority patent/IE42022B1/en
Priority to DE19752547493 priority patent/DE2547493A1/en
Publication of GB1521971A publication Critical patent/GB1521971A/en
Priority to HK396/79A priority patent/HK39679A/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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/0805—Details of the phase-locked loop the loop being adapted to provide an additional control signal for use outside 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
    • H03L7/07—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop using several loops, e.g. for redundant clock signal generation

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

1521971 Automatic frequency control STANDARD TELEPHONES & CABLES Ltd 21 Oct 1975 [29 Oct 1974] 46744/74 Heading H3A An oscillator arrangement, e.g. clock oscillators in a telephone exchange, includes: an array of oscillators, e.g. crystal oscillators 01, 02, 03 all tuned to the same predetermined frequency; meand PC1,A1 PC2,A2 PC3,A3 for phase locking each oscillator to the next, the last oscillator being locked to the first; detection means Q1, Q2, Q3, one associated with each oscillator, for detecting an out of lock condition between pairs of oscillators; and means, e.g. AND gates G1, G2, G3 for identifying a malfunctioning oscillator and preventing it from changing the frequencies of the other oscillators. If for example oscillator 02 goes too far off frequency, then a large correction signal is produced from phase comparators PC2, PC3. This large signal is detected by detectors Q2, Q3 which then produce an output signal from AND gate G3 to cause oscillator 03 to adopt a frequency near the centre of its range, regardless of the signal from phase comparator PC3.
GB46744/74A 1974-10-29 1974-10-29 Phase locked oscillators Expired GB1521971A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB46744/74A GB1521971A (en) 1974-10-29 1974-10-29 Phase locked oscillators
ZA00755928A ZA755928B (en) 1974-10-29 1975-09-17 Phase locked oscillators
NZ178918A NZ178918A (en) 1974-10-29 1975-10-10 Multiple locked oscillators:detecting undue drift
IE2244/75A IE42022B1 (en) 1974-10-29 1975-10-15 Phase locked oscillators
DE19752547493 DE2547493A1 (en) 1974-10-29 1975-10-23 ARRANGEMENT FOR THE PHASE-FIXED CONTROL OF OSCILLATORS
HK396/79A HK39679A (en) 1974-10-29 1979-06-21 Phase locked oscillators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB46744/74A GB1521971A (en) 1974-10-29 1974-10-29 Phase locked oscillators

Publications (1)

Publication Number Publication Date
GB1521971A true GB1521971A (en) 1978-08-23

Family

ID=10442423

Family Applications (1)

Application Number Title Priority Date Filing Date
GB46744/74A Expired GB1521971A (en) 1974-10-29 1974-10-29 Phase locked oscillators

Country Status (6)

Country Link
DE (1) DE2547493A1 (en)
GB (1) GB1521971A (en)
HK (1) HK39679A (en)
IE (1) IE42022B1 (en)
NZ (1) NZ178918A (en)
ZA (1) ZA755928B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135464A (en) * 1983-02-19 1984-08-30 Standard Telephones Cables Ltd Triplicate signal check circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135464A (en) * 1983-02-19 1984-08-30 Standard Telephones Cables Ltd Triplicate signal check circuit

Also Published As

Publication number Publication date
DE2547493A1 (en) 1976-05-06
HK39679A (en) 1979-06-29
IE42022L (en) 1976-04-29
IE42022B1 (en) 1980-05-21
ZA755928B (en) 1976-08-25
NZ178918A (en) 1979-12-11

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee