GB1165325A - Improvements in or relating to Spectrum Frequency Generators - Google Patents

Improvements in or relating to Spectrum Frequency Generators

Info

Publication number
GB1165325A
GB1165325A GB888866A GB888866A GB1165325A GB 1165325 A GB1165325 A GB 1165325A GB 888866 A GB888866 A GB 888866A GB 888866 A GB888866 A GB 888866A GB 1165325 A GB1165325 A GB 1165325A
Authority
GB
United Kingdom
Prior art keywords
oscillator
output
frequency
mixer
fed
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
GB888866A
Inventor
Alan Frederick Evers
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 GB888866A priority Critical patent/GB1165325A/en
Publication of GB1165325A publication Critical patent/GB1165325A/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
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop

Abstract

1,165,325. Frequency synthesizing circuits; automatic frequency control systems. PLESSEY CO. Ltd. 1 Feb., 1967 [1 March, 1966], No. 8888/66. Headings H3A and H3F. A digital frequency synthesizer, Fig. 3, comprises a number of stages 25 ... 28 appertaining to the respective digits, the stage 28 corresponding to the least significant digit including a slave oscillator 18, the frequency of which is variable in dependence upon the setting of a control means 22, and the other stages 25, 26, 27 including a slave oscillator 18, the frequency of which is variable independence on the setting of a control means 22 and also on the signal applied to it from the stage corresponding to the digit of next lowest significance. In each of the stages 25, 26, 27 the signal from the slave oscillator 18 and that from the preceding stage are mixed in mixers 19, and the mixer output is fed to the control means 22 via a bandpass filter 21. The synthesizer may be employed as an oscillator 15 in a receiver, Fig. 2. Incoming signals are fed to first and second mixers 1, 5 each associated with a respective local oscillator 3, 6. The output from the digital oscillator 15 and local oscillator 6 are fed to mixer 16 and the resulting output is then fed together with the output from local oscillator 3 to a further mixer 8. The output from mixer 8 is compared with the signal from a reference source 13 to provide coarse 11, and fine 12 control for oscillator 3.
GB888866A 1966-03-01 1966-03-01 Improvements in or relating to Spectrum Frequency Generators Expired GB1165325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB888866A GB1165325A (en) 1966-03-01 1966-03-01 Improvements in or relating to Spectrum Frequency Generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888866A GB1165325A (en) 1966-03-01 1966-03-01 Improvements in or relating to Spectrum Frequency Generators

Publications (1)

Publication Number Publication Date
GB1165325A true GB1165325A (en) 1969-09-24

Family

ID=9861243

Family Applications (1)

Application Number Title Priority Date Filing Date
GB888866A Expired GB1165325A (en) 1966-03-01 1966-03-01 Improvements in or relating to Spectrum Frequency Generators

Country Status (1)

Country Link
GB (1) GB1165325A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124568A1 (en) * 1980-07-12 1982-06-24 Racal-Dana Instruments Ltd., Bracknell, Berkshire FREQUENCY SYNTHESIS DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124568A1 (en) * 1980-07-12 1982-06-24 Racal-Dana Instruments Ltd., Bracknell, Berkshire FREQUENCY SYNTHESIS DEVICE

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees