GB1022766A - Frequency-stabilised oscillator - Google Patents

Frequency-stabilised oscillator

Info

Publication number
GB1022766A
GB1022766A GB462963A GB462963A GB1022766A GB 1022766 A GB1022766 A GB 1022766A GB 462963 A GB462963 A GB 462963A GB 462963 A GB462963 A GB 462963A GB 1022766 A GB1022766 A GB 1022766A
Authority
GB
United Kingdom
Prior art keywords
frequency
discriminator
oscillator
phase
divider
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
GB462963A
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
Publication of GB1022766A publication Critical patent/GB1022766A/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
    • 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
    • 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
    • H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator
    • 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
    • H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it

Landscapes

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

Abstract

1,022,766. Automatic frequency control systems. STANDARD TELEPHONE & CABLES Ltd. Feb. 5, 1963 [Feb. 5, 1962], No. 4629/63. Heading H3A. An oscillator 1 is frequency stabilized by the conjoint outputs of a frequency discriminator 3 and two phase discriminators 14 having different time constant output circuits, to which also a reference frequency equal to the frequency discriminator centre frequency f 0 is applied. Wideband capture but fine frequency control is therefore obtained. The oscillator frequency is first transposed down by selected multiples of decade frequency dividers 21-23 actuated in cascade from a stable reference oscillator 19 and by a final low frequency oscillator 26 to a frequency f about equal to the discriminator centre frequency f 0 , f 0 being also a multiple of the lowest frequency step of the divider; and the input to the frequency discriminator 3 applied also to a phase discriminator 14 together with frequency f 0 obtained from the last stage 23 of the reference frequency divider by frequency multiplication at 24 and frequency conversion by oscillator 26. (The oscillator 26 has a frequency a multiple of the lowest frequency step of the divider but, although not stable, its effect balances out in the two inputs to the phase discriminator). The discriminator 14 (Fig. 4) comprises a pair of phase discriminators one of whose outputs amplified at 12, if long time constant, is added to a short time constant output (developed in one phase discriminator 14 in push-pull across resistors r a ) and to the frequency discriminator output amplified at 7. A search, i.e. scanning oscillation is generated by feedback at 36 when the oscillator 1 is not correctly tuned, but when approximately tuned by discriminator 3 oscillations pass a filter 33 and threshold amplifier 34 and a bi-stable circuit is actuated to act on gate 32 (Fig. 3) and prevent further input to the frequency discriminator 3 so that the search oscillation consequently ceases. By a switch C decimal frequency steps may be added due to an interpolation oscillator 30 whose frequency is determined by an input i which also correspondingly alters the discriminator tuning by acting on a variable reactance element.
GB462963A 1962-02-05 1963-02-05 Frequency-stabilised oscillator Expired GB1022766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR886978A FR1321475A (en) 1962-02-05 1962-02-05 Stabilized frequency oscillator

Publications (1)

Publication Number Publication Date
GB1022766A true GB1022766A (en) 1966-03-16

Family

ID=8771974

Family Applications (1)

Application Number Title Priority Date Filing Date
GB462963A Expired GB1022766A (en) 1962-02-05 1963-02-05 Frequency-stabilised oscillator

Country Status (5)

Country Link
BE (1) BE627993A (en)
CH (1) CH402970A (en)
FR (1) FR1321475A (en)
GB (1) GB1022766A (en)
NL (1) NL288601A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528026A (en) * 1968-05-01 1970-09-08 Hughes Aircraft Co Coarse-fine phase locked loop
US3826994A (en) * 1973-07-02 1974-07-30 H Holliday Phase lock-loop frequency synthesizer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616191A (en) * 1983-07-05 1986-10-07 Raytheon Company Multifrequency microwave source

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528026A (en) * 1968-05-01 1970-09-08 Hughes Aircraft Co Coarse-fine phase locked loop
US3826994A (en) * 1973-07-02 1974-07-30 H Holliday Phase lock-loop frequency synthesizer

Also Published As

Publication number Publication date
CH402970A (en) 1965-11-30
NL288601A (en)
BE627993A (en)
FR1321475A (en) 1963-03-22

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