IE42022L - Phase locked oscillators - Google Patents

Phase locked oscillators

Info

Publication number
IE42022L
IE42022L IE752244A IE224475A IE42022L IE 42022 L IE42022 L IE 42022L IE 752244 A IE752244 A IE 752244A IE 224475 A IE224475 A IE 224475A IE 42022 L IE42022 L IE 42022L
Authority
IE
Ireland
Prior art keywords
oscillator
oscillators
signal
frequency
oct
Prior art date
Application number
IE752244A
Other versions
IE42022B1 (en
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IE42022L publication Critical patent/IE42022L/en
Publication of IE42022B1 publication Critical patent/IE42022B1/en

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. [GB1521971A]
IE2244/75A 1974-10-29 1975-10-15 Phase locked oscillators IE42022B1 (en)

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 (2)

Publication Number Publication Date
IE42022L true IE42022L (en) 1976-04-29
IE42022B1 IE42022B1 (en) 1980-05-21

Family

ID=10442423

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2244/75A IE42022B1 (en) 1974-10-29 1975-10-15 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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135464B (en) * 1983-02-19 1986-07-02 Standard Telephones Cables Ltd Triplicate signal check circuit

Also Published As

Publication number Publication date
GB1521971A (en) 1978-08-23
DE2547493A1 (en) 1976-05-06
HK39679A (en) 1979-06-29
IE42022B1 (en) 1980-05-21
ZA755928B (en) 1976-08-25
NZ178918A (en) 1979-12-11

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