GB992645A - Improvements in or relating to circuit arrangement for frequency control of oscillators - Google Patents

Improvements in or relating to circuit arrangement for frequency control of oscillators

Info

Publication number
GB992645A
GB992645A GB1310062A GB1310062A GB992645A GB 992645 A GB992645 A GB 992645A GB 1310062 A GB1310062 A GB 1310062A GB 1310062 A GB1310062 A GB 1310062A GB 992645 A GB992645 A GB 992645A
Authority
GB
United Kingdom
Prior art keywords
capacitor
voltage
frequency
frequency control
controllable
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
GB1310062A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB992645A publication Critical patent/GB992645A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
    • H03J7/10—Modification of automatic frequency control sensitivity or linearising automatic frequency control operation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/22—Angle modulation by means of variable impedance by means of a variable reactive element the element being a semiconductor diode, e.g. varicap diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

992,645. Automatic frequency control systems. SIEMENS & HALSKE A.G. April 5, 1962 [April 5, 1961], No. 13100/62. Heading H3A. In frequency control of a variable-frequency oscillator a voltage-controllable capacitor C3 is in series with the tuning capacitor C1 or the whole tuning circuit and a voltage controllable capacitor C3 in parallel with the tuning capacitor C1 or the whole tuning circuit, and both controllable capacitors C3<SP>1</SP>, C3 may be independently adjustable and varied as shown by a control voltage at A. Alternatively, Fig. 2, the tuning capacitor C5 and a padding capacitor C8 form one leg of a bridge whose other leg is formed by a capacitor C5 in series with only one voltage variable capacitor C7 and the bridge diagonally connected by a capacitor C9, which is non-conductive, i.e. the bridge balanced, around the mid-frequency of the oscillator frequency. The systems provide more linear frequency control. The voltage controllable capacity diodes may be replaced by reactance tube or transistor circuits, or by a capacitor in series with a diode whose duty cycle period of conduction is variably controlled.
GB1310062A 1961-04-05 1962-04-05 Improvements in or relating to circuit arrangement for frequency control of oscillators Expired GB992645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES73320A DE1171029B (en) 1961-04-05 1961-04-05 Circuit for frequency readjustment of tunable oscillators

Publications (1)

Publication Number Publication Date
GB992645A true GB992645A (en) 1965-05-19

Family

ID=7503824

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1310062A Expired GB992645A (en) 1961-04-05 1962-04-05 Improvements in or relating to circuit arrangement for frequency control of oscillators

Country Status (4)

Country Link
DE (1) DE1171029B (en)
GB (1) GB992645A (en)
NL (1) NL276779A (en)
SE (1) SE320109B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482871A (en) * 1982-06-28 1984-11-13 Motorola Inc. Wideband VCO including variable capacitive output coupling varactor for constant power output

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS622813Y2 (en) * 1979-07-20 1987-01-22
DE3447118A1 (en) * 1984-12-22 1986-07-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt PLL frequency modulator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB735506A (en) * 1950-12-28 1955-08-24 British Telecomm Res Ltd Improvements in and relating to variable impedance devices
DE911742C (en) * 1952-02-17 1954-05-20 Telefunken Gmbh Circuit arrangement for changing the frequency of an oscillator
US2906968A (en) * 1957-12-27 1959-09-29 Montgomery George Franklin Transistor-controlled reactance modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482871A (en) * 1982-06-28 1984-11-13 Motorola Inc. Wideband VCO including variable capacitive output coupling varactor for constant power output

Also Published As

Publication number Publication date
NL276779A (en)
DE1171029B (en) 1964-05-27
SE320109B (en) 1970-02-02

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