GB2015277A - Frequency synthesizer - Google Patents
Frequency synthesizerInfo
- Publication number
- GB2015277A GB2015277A GB7844526A GB7844526A GB2015277A GB 2015277 A GB2015277 A GB 2015277A GB 7844526 A GB7844526 A GB 7844526A GB 7844526 A GB7844526 A GB 7844526A GB 2015277 A GB2015277 A GB 2015277A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- signal
- output
- phase comparator
- comparing
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 abstract 1
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
- H03L7/187—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
A frequency synthesizer useable in 'frequency hop' type transmission comprises a phase locked loop including a controlled oscillator 1, an adjustable ratio divider 3 a phase comparator 4 for comparing the divided output frequency with a reference signal, a frequency control circuit including a frequency discriminator (8), a level comparator 7 for comparing the frequency discriminator output signal with phase comparator output signal and programming means 10-17 for superimposing a signal on the phase comparator output signals to effect a change in the frequency of the oscillator 1 and simultaneously to adjust the division ratio of the divider 3 to correspond to the changed frequency for eliminating or minimizing the loop unstable period arising from such a change in output frequency. The programming means may include clocked latches 12, 13 and a D/A converter 17 responsive to a digital signal applied at 10. For frequency hopping, a pseudo-random signal is applied at 10. Frequency modulation of the output may be effected by a signal applied at 20. <IMAGE>
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7844526A GB2015277B (en) | 1977-11-30 | 1978-11-15 | Frequency synthesizer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4997277 | 1977-11-30 | ||
GB7844526A GB2015277B (en) | 1977-11-30 | 1978-11-15 | Frequency synthesizer |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2015277A true GB2015277A (en) | 1979-09-05 |
GB2015277B GB2015277B (en) | 1982-09-29 |
Family
ID=26266579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7844526A Expired GB2015277B (en) | 1977-11-30 | 1978-11-15 | Frequency synthesizer |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2015277B (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2483704A1 (en) * | 1980-06-03 | 1981-12-04 | Thomson Csf | FREQUENCY PRESPOSITION DEVICE FOR INDIRECT SYNTHESIZER OF FREQUENCY AND SYNTHESIZER COMPRISING SUCH A DEVICE |
EP0045795A1 (en) * | 1980-02-20 | 1982-02-17 | Motorola Inc | Synchronized frequency synthesizer with high speed lock. |
GB2124047A (en) * | 1982-07-10 | 1984-02-08 | Plessey Co Plc | Frequency synthesiser |
EP0315489A2 (en) * | 1987-11-06 | 1989-05-10 | Hewlett-Packard Company | Fast frequency settling signal generator utilizing a frequency locked-loop |
US4885553A (en) * | 1988-11-30 | 1989-12-05 | Motorola, Inc. | Continuously adaptive phase locked loop synthesizer |
EP0364679A1 (en) * | 1988-10-18 | 1990-04-25 | Siemens-Albis Aktiengesellschaft | Frequency synthesizer apparatus |
EP0404596A2 (en) * | 1989-06-23 | 1990-12-27 | Nec Corporation | Frequency setting method and apparatus for radio transmission apparatus |
US5038120A (en) * | 1989-03-04 | 1991-08-06 | Racal-Dana Instruments Limited | Frequency modulated phase locked loop with fractional divider and jitter compensation |
GB2373113A (en) * | 2001-08-24 | 2002-09-11 | Roke Manor Research | Improvements in or relating to fast frequency-hopping synthesisers |
-
1978
- 1978-11-15 GB GB7844526A patent/GB2015277B/en not_active Expired
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0045795A1 (en) * | 1980-02-20 | 1982-02-17 | Motorola Inc | Synchronized frequency synthesizer with high speed lock. |
EP0045795A4 (en) * | 1980-02-20 | 1982-07-13 | Motorola Inc | Synchronized frequency synthesizer with high speed lock. |
FR2483704A1 (en) * | 1980-06-03 | 1981-12-04 | Thomson Csf | FREQUENCY PRESPOSITION DEVICE FOR INDIRECT SYNTHESIZER OF FREQUENCY AND SYNTHESIZER COMPRISING SUCH A DEVICE |
EP0041882A1 (en) * | 1980-06-03 | 1981-12-16 | Thomson-Csf | Frequency presetting device for an indirect frequency synthesizer, and synthesizer comprising such a device |
GB2124047A (en) * | 1982-07-10 | 1984-02-08 | Plessey Co Plc | Frequency synthesiser |
EP0315489A2 (en) * | 1987-11-06 | 1989-05-10 | Hewlett-Packard Company | Fast frequency settling signal generator utilizing a frequency locked-loop |
EP0315489A3 (en) * | 1987-11-06 | 1989-07-19 | Hewlett-Packard Company | Fast frequency settling signal generator utilizing a frequency locked-loop |
EP0364679A1 (en) * | 1988-10-18 | 1990-04-25 | Siemens-Albis Aktiengesellschaft | Frequency synthesizer apparatus |
US5019785A (en) * | 1988-10-18 | 1991-05-28 | Siemens-Albis Aktiengesellschaft | Frequency synthesizing device |
US4885553A (en) * | 1988-11-30 | 1989-12-05 | Motorola, Inc. | Continuously adaptive phase locked loop synthesizer |
US5038120A (en) * | 1989-03-04 | 1991-08-06 | Racal-Dana Instruments Limited | Frequency modulated phase locked loop with fractional divider and jitter compensation |
EP0404596A2 (en) * | 1989-06-23 | 1990-12-27 | Nec Corporation | Frequency setting method and apparatus for radio transmission apparatus |
EP0404596A3 (en) * | 1989-06-23 | 1991-03-27 | Nec Corporation | Frequency setting method and apparatus for radio transmission apparatus |
AU628997B2 (en) * | 1989-06-23 | 1992-09-24 | Nec Corporation | Frequency setting method for radio transmission apparatus |
GB2373113A (en) * | 2001-08-24 | 2002-09-11 | Roke Manor Research | Improvements in or relating to fast frequency-hopping synthesisers |
GB2373113B (en) * | 2001-08-24 | 2003-01-22 | Roke Manor Research | Improvements in or relating to fast frequency-hopping synthesisers |
Also Published As
Publication number | Publication date |
---|---|
GB2015277B (en) | 1982-09-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |