GB1172650A – A Digital Frequency Synthesizer Eliminating High Speed Counters.
– Google Patents
GB1172650A – A Digital Frequency Synthesizer Eliminating High Speed Counters.
– Google Patents
A Digital Frequency Synthesizer Eliminating High Speed Counters.
Info
Publication number
GB1172650A
GB1172650A
GB33062/68A
GB3306268A
GB1172650A
GB 1172650 A
GB1172650 A
GB 1172650A
GB 33062/68 A
GB33062/68 A
GB 33062/68A
GB 3306268 A
GB3306268 A
GB 3306268A
GB 1172650 A
GB1172650 A
GB 1172650A
Authority
GB
United Kingdom
Prior art keywords
frequency
phase detector
output
oscillator
responsive
Prior art date
1967-08-24
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
GB33062/68A
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.)
Bendix Corp
Original Assignee
Bendix Corp
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.)
1967-08-24
Filing date
1968-07-11
Publication date
1969-12-03
1968-07-11
Application filed by Bendix Corp
filed
Critical
Bendix Corp
1969-12-03
Publication of GB1172650A
publication
Critical
patent/GB1172650A/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
H03L7/22—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
H03L7/23—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 with pulse counters or frequency dividers
Abstract
1,172,650. Automatic frequency control. BENDIX CORP. 11 July, 1968 [24 Aug., 1967], No. 33062/68. Heading H3A. A digital frequency synthesizer comprises a first variable-frequency oscillator 10 responsive to a first error signal V 1 for generating a synthesizer output frequency f o , and second 12 and third 18 variable-frequency oscillators responsive to second V 2 and third V 3 error signals for generating second f 2 and third f 3 frequencies respectively. A first frequency spectrum generator 13 generates harmonics of the second frequency f 2 , means responsive to said harmonics and the synthesized output frequency f 0 , i.e. phase detector 15, generating the second error signal V 2 . A second frequency spectrum generator 25 responsive to the third frequency f 3 generates harmonics thereof; means responsive to the third frequency harmonics and the synthesized output frequency f 0 , i.e. mixer 26 generates a complex frequency spectrum from which a desired frequency is selected by filtering means 27, i.e. a low-pass filter. The output of a source of reference frequency 29, i.e. a crystal oscillator is compared with the selected frequency in means 28, i.e. a phase detector, to generate the first error signal V 1 . In the embodiment, the third error signal V 3 controlling the frequency of the third variable frequency oscillator 18 is generated by dividing the frequency f 2 by N in a first divider 20, which is ganged to a second divider 19 which divides the frequency f 3 by N – 1. Dividers 19, 20 comprise cascades of binary counters; the output of divider 19 is applied to a pulse and ramp type phase detector 21 comprising pulse former 21 – 1 to generate narrow pulses which open bilateral AND gate 21 – 3. The output of divider 20 is applied to pulse former 21 – 2 which comprises a ramp generator, the ramp voltage being applied to gate 21 – 3. During the intervals gate 21 – 3 is open a voltage sampled from the ramp voltage is fed to memory 21-4 which may comprise a low-loss capacitor whose discharge path is blocked when the gate is closed, to produce the third control voltage V 3 via filter 22 which removes undesired A.C. components. The first oscillator 10 may comprise a backward wave microwave oscillator, phase detector 28 may like detector 21 be of the pulse and ramp type, while phase detector 15 comprises a diode ring demodulator.
GB33062/68A
1967-08-24
1968-07-11
A Digital Frequency Synthesizer Eliminating High Speed Counters.
Expired
GB1172650A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US66299167A
1967-08-24
1967-08-24
Publications (1)
Publication Number
Publication Date
GB1172650A
true
GB1172650A
(en)
1969-12-03
Family
ID=24660056
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB33062/68A
Expired
GB1172650A
(en)
1967-08-24
1968-07-11
A Digital Frequency Synthesizer Eliminating High Speed Counters.
Country Status (4)
Country
Link
US
(1)
US3448401A
(en)
DE
(1)
DE1766830B1
(en)
FR
(1)
FR1581226A
(en)
GB
(1)
GB1172650A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3837246A1
(en)
*
1988-10-28
1990-05-03
Siemens Ag
Frequency generator
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1314462A
(en)
*
1970-04-28
1973-04-26
Sperry Rand Corp
Signal generators
US3777271A
(en)
*
1971-10-04
1973-12-04
Cutler Hammer Inc
Generation of microwave frequency combs with narrow line spacing
US3972818A
(en)
*
1974-08-22
1976-08-03
General Atomic Company
Blood filter using glassy carbon fibers
GB1564375A
(en)
*
1977-09-07
1980-04-10
Marconi Co Ltd
Frequency generators
JPS5487008A
(en)
*
1977-12-22
1979-07-11
Alps Electric Co Ltd
Pll channel selector
WO2007068283A1
(en)
*
2005-12-12
2007-06-21
Semtech Neuchâtel SA
Sensor interface
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2964714A
(en)
*
1959-04-02
1960-12-13
Jakubowics Edward
Automatic frequency control system
AT245052B
(en)
*
1962-11-30
1966-02-10
Philips Nv
Multi-channel generator
1967
1967-08-24
US
US662991A
patent/US3448401A/en
not_active
Expired – Lifetime
1968
1968-07-11
GB
GB33062/68A
patent/GB1172650A/en
not_active
Expired
1968-07-25
DE
DE19681766830
patent/DE1766830B1/en
not_active
Withdrawn
1968-08-20
FR
FR1581226D
patent/FR1581226A/fr
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3837246A1
(en)
*
1988-10-28
1990-05-03
Siemens Ag
Frequency generator
Also Published As
Publication number
Publication date
US3448401A
(en)
1969-06-03
DE1766830B1
(en)
1971-10-07
FR1581226A
(en)
1969-09-12
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Legal Events
Date
Code
Title
Description
1970-04-15
PS
Patent sealed [section 19, patents act 1949]
1979-02-21
PCNP
Patent ceased through non-payment of renewal fee
