GB1229376A – – Google Patents
GB1229376A – – Google Patents
Info
Publication number
GB1229376A
GB1229376A
GB1229376DA
GB1229376A
GB 1229376 A
GB1229376 A
GB 1229376A
GB 1229376D A
GB1229376D A
GB 1229376DA
GB 1229376 A
GB1229376 A
GB 1229376A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillator
phase comparator
output
applied over
Prior art date
1968-09-23
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
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.)
1968-09-23
Filing date
1969-09-22
Publication date
1971-04-21
1969-09-22
Application filed
filed
Critical
1971-04-21
Publication of GB1229376A
publication
Critical
patent/GB1229376A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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
H03L7/08—Details of the phase-locked loop
H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
H03L7/087—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using at least two phase detectors or a frequency and phase detector in the loop
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
H03L7/08—Details of the phase-locked loop
H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
H03L7/091—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector using a sampling device
Abstract
1,229,376. Frequency generators. R.C.A. CORPORATION. 22 Sept., 1969 [23 Sept., 1968], No. 46467/69. Heading H3A. The invention relates to a digital frequency synthesizer, in which the output of a voltagecontrolled oscillator 12 is applied to a variablefrequency dividing network 20, the output of which is applied to one input of a phase comparator circuit 42. A reference frequency source 28 applies a reference frequency to a second input of the phase comparator 42 and produces a correction signal which is applied over line 48 to correct the frequency of the oscillator 12. In such an arrangement, if the frequency Fn applied to the phase comparator circuit 42 is low, the frequency of the oscillator 12 can drift seriously between successive checks in the phase comparator. To provide a more frequent control of the oscillator frequency its output is applied over line 58 to a sample gate 56 in which it is gated at the frequency delivered by divider 32 from the pulse reference oscillator 28. The output from sample gate 56 is applied over buffer 62 and low-pass filter 68 to a combiner 50 in which it is added in to control the frequency of oscillator 12. Ganged switches 74, 76 may be provided whereby the primary control loop via phase comparator 42 is only completed when setting up the frequency of the oscillator; alternatively the primary control loop may be closed at intervals to check the frequency.
GB1229376D
1968-09-23
1969-09-22
Expired
GB1229376A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US76175968A
1968-09-23
1968-09-23
Publications (1)
Publication Number
Publication Date
GB1229376A
true
GB1229376A
(en)
1971-04-21
Family
ID=25063193
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1229376D
Expired
GB1229376A
(en)
1968-09-23
1969-09-22
Country Status (4)
Country
Link
US
(1)
US3546618A
(en)
JP
(1)
JPS4819091B1
(en)
DE
(1)
DE1948109A1
(en)
GB
(1)
GB1229376A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3201039A1
(en)
*
1982-01-15
1983-07-28
Robert Bosch Gmbh, 7000 Stuttgart
Oscillator circuit for a few-channel radio unit
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3660781A
(en)
*
1970-10-19
1972-05-02
Bendix Corp
Low power frequency synthesizer with two phase locking loops
US3863174A
(en)
*
1973-05-21
1975-01-28
Int Standard Electric Corp
Frequency synthesizer having phase-locked loop including sample and hold circuit frequency converter
DE2648796C2
(en)
*
1976-10-27
1978-12-14
Siemens Ag, 1000 Berlin Und 8000 Muenchen
Circuit for synchronizing the oscillation of a pulse-sampled oscillator with a reference oscillation
DE2826053C2
(en)
*
1978-06-12
1982-02-18
Heinrich-Hertz-Institut für Nachrichtentechnik Berlin GmbH, 1000 Berlin
Method and circuit arrangement for controlling a freely oscillating oscillator
US4521918A
(en)
*
1980-11-10
1985-06-04
General Electric Company
Battery saving frequency synthesizer arrangement
CA2507098A1
(en)
*
2002-11-28
2004-06-10
Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.
Frequency generator
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3023370A
(en)
*
1959-11-25
1962-02-27
Servo Corp Of America
Variable frequency generator control circuit
US3130375A
(en)
*
1961-03-01
1964-04-21
Honeywell Regulator Co
Automatic frequency control apparatus
FR1452109A
(en)
*
1965-06-30
1966-02-25
Materiel Telephonique
Stabilized variable oscillator
1968
1968-09-23
US
US761759A
patent/US3546618A/en
not_active
Expired – Lifetime
1969
1969-09-22
GB
GB1229376D
patent/GB1229376A/en
not_active
Expired
1969-09-22
JP
JP44075749A
patent/JPS4819091B1/ja
active
Pending
1969-09-23
DE
DE19691948109
patent/DE1948109A1/en
active
Pending
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3201039A1
(en)
*
1982-01-15
1983-07-28
Robert Bosch Gmbh, 7000 Stuttgart
Oscillator circuit for a few-channel radio unit
Also Published As
Publication number
Publication date
DE1948109A1
(en)
1970-10-22
US3546618A
(en)
1970-12-08
JPS4819091B1
(en)
1973-06-11
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Legal Events
Date
Code
Title
Description
1971-09-02
PS
Patent sealed [section 19, patents act 1949]
1980-04-30
PCNP
Patent ceased through non-payment of renewal fee
