GB1090760A - Improvements in or relating to frequency modulated oscillator circuits - Google Patents

Improvements in or relating to frequency modulated oscillator circuits

Info

Publication number
GB1090760A
GB1090760A GB1707164A GB1707164A GB1090760A GB 1090760 A GB1090760 A GB 1090760A GB 1707164 A GB1707164 A GB 1707164A GB 1707164 A GB1707164 A GB 1707164A GB 1090760 A GB1090760 A GB 1090760A
Authority
GB
United Kingdom
Prior art keywords
emitter
phase
modulation
frequency
shift
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
GB1707164A
Inventor
Rowland Anthony Cra Fothergill
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB1707164A priority Critical patent/GB1090760A/en
Priority to FR14015A priority patent/FR1431535A/en
Publication of GB1090760A publication Critical patent/GB1090760A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/24—Angle modulation by means of variable impedance by means of a variable resistive element, e.g. tube

Landscapes

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

Abstract

1,090,760. Frequency modulation. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. June 24, 1965 [April 24, 1964], No. 17071/64. Heading H3R. A frequency modulated phase-shift oscillator comprises two series connected, emitter driven, earthed base transistors VT 1 , VT 2 , each producing a phase-shift of about -45 degrees, the second supplying over a shunt capacitor C 2 , producing a further - 90 degrees phase-shift, a phase inverting transistor amplifier VT 4 with output connected back to the first transistor VT 1 . An emitter follower buffer stage VT 3 may connect VT 2 and VT 4 . Modulation may be applied to the emitter of VT 1 through a transistor amplifier VT 5 whose emitter/base input circuit is shunted by an inductor Z and resistor R 1 in series, to counteract non-linearity in the frequency swing and make it exactly proportional to the change in emitter current of the series transistors VT 1 , VT 2 . Further, the modulation may be applied through a phase splitting transistor VT 6 , with collector circuit feeding VT 5 , and emitter circuit connected through an R.F. choke, parallel resonant at the mean oscillator frequency, to the base of the emitter follower VT 5 so that amplitude modulation is avoided.
GB1707164A 1964-04-24 1964-04-24 Improvements in or relating to frequency modulated oscillator circuits Expired GB1090760A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1707164A GB1090760A (en) 1964-04-24 1964-04-24 Improvements in or relating to frequency modulated oscillator circuits
FR14015A FR1431535A (en) 1964-04-24 1965-04-21 Improvements to frequency modulation oscillator circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1707164A GB1090760A (en) 1964-04-24 1964-04-24 Improvements in or relating to frequency modulated oscillator circuits

Publications (1)

Publication Number Publication Date
GB1090760A true GB1090760A (en) 1967-11-15

Family

ID=10088744

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1707164A Expired GB1090760A (en) 1964-04-24 1964-04-24 Improvements in or relating to frequency modulated oscillator circuits

Country Status (1)

Country Link
GB (1) GB1090760A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695808A (en) * 1984-02-27 1987-09-22 Ncr Corporation Varying frequency oscillator for the reduction of radiated emissions of electronic equipment
US5488627A (en) * 1993-11-29 1996-01-30 Lexmark International, Inc. Spread spectrum clock generator and associated method
US5872807A (en) * 1993-11-29 1999-02-16 Lexmark International, Inc. Spread spectrum clock generator and associated method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695808A (en) * 1984-02-27 1987-09-22 Ncr Corporation Varying frequency oscillator for the reduction of radiated emissions of electronic equipment
US5488627A (en) * 1993-11-29 1996-01-30 Lexmark International, Inc. Spread spectrum clock generator and associated method
US5867524A (en) * 1993-11-29 1999-02-02 Lexmark International Inc. Spread spectrum clock generator and associated method
US5872807A (en) * 1993-11-29 1999-02-16 Lexmark International, Inc. Spread spectrum clock generator and associated method

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