GB1155502A - Stabilised Variable Oscillator - Google Patents

Stabilised Variable Oscillator

Info

Publication number
GB1155502A
GB1155502A GB313467A GB313467A GB1155502A GB 1155502 A GB1155502 A GB 1155502A GB 313467 A GB313467 A GB 313467A GB 313467 A GB313467 A GB 313467A GB 1155502 A GB1155502 A GB 1155502A
Authority
GB
United Kingdom
Prior art keywords
oscillator
frequency
phase discriminator
jan
input
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
GB313467A
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.)
International Standard Electric Corp
Original Assignee
International 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1155502A publication Critical patent/GB1155502A/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
    • H03L7/10—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
    • 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
    • H03L7/189—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 comprising a D/A converter for generating a coarse tuning voltage

Landscapes

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

Abstract

1,155,502. Automatic frequency control systems. INTERNATIONAL STANDARD ELECTRIC CORP. 20 Jan., 1967 [21 Jan., 1966], No. 3134/67. Addition to 1,111,355. Heading H3A. A system as described in Specification 1,111,355 wherein the frequency of a variable frequency oscillator is too high initially and is reduced incrementally so long as two pulses derived by frequency division from the oscillator reach a frequency comparator unit within the interval between two reference pulses, is characterized in that the phase discriminator which subsequently controls the oscillator is set to a mean value during the initial search period. The phase discriminator (Figs. 6 and 8, not shown), may comprise a sawtooth generator triggered by one input and sampled by the other input, the sample being stored on a memory capacitor feeding a high impedance output circuit. During the search period a signal is applied to the output circuit so that it produces a mean output voltage. The output of the phase discriminator may be fed directly to the oscillator (Fig. 2, not shown) or may be fed to the digital-to-analogue converter operated by the frequency comparator unit and controlling the oscillator frequency (Fig. 3, not shown).
GB313467A 1966-01-21 1967-01-20 Stabilised Variable Oscillator Expired GB1155502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR46748A FR90161E (en) 1966-01-21 1966-01-21 Stabilized variable oscillator

Publications (1)

Publication Number Publication Date
GB1155502A true GB1155502A (en) 1969-06-18

Family

ID=8599380

Family Applications (1)

Application Number Title Priority Date Filing Date
GB313467A Expired GB1155502A (en) 1966-01-21 1967-01-20 Stabilised Variable Oscillator

Country Status (4)

Country Link
BE (1) BE692786A (en)
FR (1) FR90161E (en)
GB (1) GB1155502A (en)
NL (1) NL6700990A (en)

Also Published As

Publication number Publication date
DE1591180B2 (en) 1973-02-08
FR90161E (en) 1967-10-27
DE1591180A1 (en) 1970-12-17
BE692786A (en) 1967-07-18
NL6700990A (en) 1967-07-24

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