GB2015277A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

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
Application number
GB7844526A
Other versions
GB2015277B (en
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB7844526A priority Critical patent/GB2015277B/en
Publication of GB2015277A publication Critical patent/GB2015277A/en
Application granted granted Critical
Publication of GB2015277B publication Critical patent/GB2015277B/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
    • H03L7/187—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>
GB7844526A 1977-11-30 1978-11-15 Frequency synthesizer Expired GB2015277B (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (16)

* Cited by examiner, † Cited by third party
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