GB1456903A - Frequency synthesizer - Google Patents
Frequency synthesizerInfo
- 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
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
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
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).
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)
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 |
-
1973
- 1973-02-21 FR FR7306115A patent/FR2218695B1/fr not_active Expired
-
1974
- 1974-02-08 GB GB587774A patent/GB1456903A/en not_active Expired
- 1974-02-14 DE DE19742407090 patent/DE2407090A1/en active Pending
- 1974-02-21 BE BE2053434A patent/BE811348R/en active
- 1974-03-27 IT IT4973274A patent/IT1057879B/en active
Also Published As
Publication number | Publication date |
---|---|
FR2218695A1 (en) | 1974-09-13 |
BE811348R (en) | 1974-08-21 |
DE2407090A1 (en) | 1974-08-22 |
AU6569474A (en) | 1975-08-21 |
FR2218695B1 (en) | 1977-04-22 |
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 |