GB1456903A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
GB1456903A
GB1456903A GB587774A GB587774A GB1456903A GB 1456903 A GB1456903 A GB 1456903A GB 587774 A GB587774 A GB 587774A GB 587774 A GB587774 A GB 587774A GB 1456903 A GB1456903 A GB 1456903A
Authority
GB
United Kingdom
Prior art keywords
signal
frequency
generated
oscillator
type
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
GB587774A
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 GB1456903A publication Critical patent/GB1456903A/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
    • H03L7/191—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 at least two different signals from the frequency divider or the counter for determining the time difference

Abstract

1456903 Automatic frequency control INTERNATIONAL STANDARD ELECTRIC CORP 8 Feb 1974 [21 Feb 1973] 05877/74 Heading H3A A frequency synthesizer comprises: a voltage controlled oscillator 1 whose frequency is F A ; a divider 2 producing an output f A = F A /N; a frequency comparator 5, e.g. of the type described in Specification 1,439,015 receiving the signal f A and a reference signal f B to produce a first error signal for controlling the oscillator 1; and a sampling-type phase comparator 10 receiving the signal f A and a second reference signal mf B to produce a second error signal for controlling the oscillator 1. The phase comparator 10 is of the type in which FET 16 is controlled by signal f A to sample a ramp signal generated by 12 ... 15, the ramps being generated at a rate mf B . The signals f B and mf B may be generated by a higher frequency source 8 followed by a divider 7. The signal mf B is shaped by a pulse shaper 9, an alternative form of which, using a bi-stable (21), is described with reference to Fig. 2 (not shown).
GB587774A 1973-02-21 1974-02-08 Frequency synthesizer Expired GB1456903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7306115A FR2218695B1 (en) 1973-02-21 1973-02-21

Publications (1)

Publication Number Publication Date
GB1456903A true GB1456903A (en) 1976-12-01

Family

ID=9115180

Family Applications (1)

Application Number Title Priority Date Filing Date
GB587774A Expired GB1456903A (en) 1973-02-21 1974-02-08 Frequency synthesizer

Country Status (5)

Country Link
BE (1) BE811348R (en)
DE (1) DE2407090A1 (en)
FR (1) FR2218695B1 (en)
GB (1) GB1456903A (en)
IT (1) IT1057879B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036712C2 (en) * 1980-09-29 1982-11-25 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for in-phase triggering of a crystal-controlled clock oscillator
FR2576723A1 (en) * 1985-01-25 1986-08-01 Dassault Electronique Improved frequency synthesiser

Also Published As

Publication number Publication date
FR2218695B1 (en) 1977-04-22
DE2407090A1 (en) 1974-08-22
BE811348R (en) 1974-08-21
FR2218695A1 (en) 1974-09-13
AU6569474A (en) 1975-08-21
IT1057879B (en) 1982-03-30

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee