GB1377830A – Electric circuits and radio receivers including such circuits
– Google Patents
GB1377830A – Electric circuits and radio receivers including such circuits
– Google Patents
Electric circuits and radio receivers including such circuits
Info
Publication number
GB1377830A
GB1377830A
GB3734972A
GB3734972A
GB1377830A
GB 1377830 A
GB1377830 A
GB 1377830A
GB 3734972 A
GB3734972 A
GB 3734972A
GB 3734972 A
GB3734972 A
GB 3734972A
GB 1377830 A
GB1377830 A
GB 1377830A
Authority
GB
United Kingdom
Prior art keywords
voltage
variable
oscillator
tuning
divider
Prior art date
1971-08-10
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
GB3734972A
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.)
Space Systems Loral LLC
Original Assignee
Philco Ford 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.)
1971-08-10
Filing date
1972-08-10
Publication date
1974-12-18
1972-08-10
Application filed by Philco Ford Corp
filed
Critical
Philco Ford Corp
1974-12-18
Publication of GB1377830A
publication
Critical
patent/GB1377830A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
H03B5/02—Details
H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
H03J3/00—Continuous tuning
H03J3/02—Details
H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
Abstract
1377830 Radio tuning arrangements; AMFM reception PHILCO-FORD CORP 10 Aug 1972 [10 Aug 1971] 37349/72 Headings H3Q and H3R [Also in Division G3] In a circuit arrangement comprising a fixed inductor 2 connected in series with a variable inductive element 1 to form a variable inductive voltage divider and an oscillator 3; 12 of which the output is connected to apply alternating voltage to the divider, the oscillator includes a negative feedback circuit 4, 5; 19, 24, 26 fed with the voltage applied across the divider and arranged to render the amplitude of oscillation substantially constant and means is provided for deriving from the potential at the junction between the fixed inductor 2 and the variable inductive element 1 an output signal of which the amplitude is a function of the value of the variable inductive element 1. As shown in Fig. 1 a mechanical tuning control is ganged to AM tuning inductors and to a variable inductor 1. When the radio is switched to operate in the FM band the variable A.C. output voltage from the inductive voltage divider 1, 2 is rectified and filtered at 8, 29, 30, Fig. 2, and is used as a tuning voltage for voltage variable capacitors 9 in the FM tuning circuit of the radio. The inductive voltage divider 1, 2 may form part of the tuned circuit of an oscillator 3 such as a Colpitts oscillator 12. The amplitude of the oscillations produced by the oscillator 3, 12 across the inductors 1, 2 is stabilized against supply voltage and temperature variations by a negative feedback circuit 4, 5 including a rectifier 19 and a D.C. amplifier 24, 26 having a reference voltage provided by a Zener diode 25. A transistor 23 provides the temperature compensation. The single variable inductor could be in the form of a bank of pushbutton selected inductors.
GB3734972A
1971-08-10
1972-08-10
Electric circuits and radio receivers including such circuits
Expired
GB1377830A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US17059171A
1971-08-10
1971-08-10
Publications (1)
Publication Number
Publication Date
GB1377830A
true
GB1377830A
(en)
1974-12-18
Family
ID=22620492
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3734972A
Expired
GB1377830A
(en)
1971-08-10
1972-08-10
Electric circuits and radio receivers including such circuits
Country Status (8)
Country
Link
US
(1)
US3727139A
(en)
JP
(2)
JPS4826401A
(en)
AR
(1)
AR192464A1
(en)
BR
(1)
BR7205401D0
(en)
CA
(1)
CA960319A
(en)
DE
(1)
DE2238312C3
(en)
GB
(1)
GB1377830A
(en)
IT
(1)
IT961931B
(en)
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2212987A5
(en)
*
1972-12-29
1974-07-26
Commissariat Energie Atomique
JPS556208Y2
(en)
*
1973-08-28
1980-02-13
US4047111A
(en)
*
1976-07-19
1977-09-06
General Motors Corporation
Tuning system for AM/FM receivers
US4392254A
(en)
*
1980-09-29
1983-07-05
Motorola Inc.
Mechanical tuner with microphonics elimination circuitry
DE102006060870A1
(en)
*
2006-12-22
2008-07-24
Atmel Duisburg Gmbh
Integrated circuit arrangement and integrated circuit
US9192425B2
(en)
*
2012-06-26
2015-11-24
Covidien Lp
System and method for testing electrosurgical generators
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3249876A
(en)
*
1963-02-07
1966-05-03
Gen Dynamics Corp
Precision tracking of electrically tuned circuits
ES346866A1
(en)
*
1966-11-07
1969-01-01
Telefunken Patent
Electrical circuit capable of oscillating in a plurality of different frequency regions comprising a plurality of capactive diodes
US3478256A
(en)
*
1966-11-15
1969-11-11
Yokogawa Electric Works Ltd
Capacitor potentiometer
GB1215296A
(en)
*
1967-01-21
1970-12-09
Sevcon Eng Ltd
Improvements in means for producing a variable voltage
CH1582668A4
(en)
*
1968-10-23
1970-11-13
US3657654A
(en)
*
1969-09-11
1972-04-18
Gen Instrument Corp
Communications receiver employing varactor controlled tuning stages
US3638096A
(en)
*
1970-12-21
1972-01-25
Bell Telephone Labor Inc
Constant frequency dc to dc converter with oscillation sustaining voltage regulation feedback loop
1971
1971-08-10
US
US00170591A
patent/US3727139A/en
not_active
Expired – Lifetime
1972
1972-07-19
CA
CA147,462A
patent/CA960319A/en
not_active
Expired
1972-08-03
JP
JP47077332A
patent/JPS4826401A/ja
active
Pending
1972-08-03
DE
DE2238312A
patent/DE2238312C3/en
not_active
Expired
1972-08-04
AR
AR243436A
patent/AR192464A1/en
active
1972-08-09
IT
IT52074/72A
patent/IT961931B/en
active
1972-08-09
BR
BR5401/72A
patent/BR7205401D0/en
unknown
1972-08-10
GB
GB3734972A
patent/GB1377830A/en
not_active
Expired
1978
1978-04-10
JP
JP1978045924U
patent/JPS5745682Y2/ja
not_active
Expired
Also Published As
Publication number
Publication date
JPS5745682Y2
(en)
1982-10-08
DE2238312A1
(en)
1973-03-15
IT961931B
(en)
1973-12-10
DE2238312B2
(en)
1975-01-23
AR192464A1
(en)
1973-02-21
US3727139A
(en)
1973-04-10
DE2238312C3
(en)
1982-08-19
CA960319A
(en)
1974-12-31
BR7205401D0
(en)
1973-06-07
JPS4826401A
(en)
1973-04-07
JPS53153801U
(en)
1978-12-04
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Legal Events
Date
Code
Title
Description
1975-04-30
PS
Patent sealed [section 19, patents act 1949]
1985-04-03
PCNP
Patent ceased through non-payment of renewal fee
