GB2009547A - Varactor tuned oscillator circuits - Google Patents

Varactor tuned oscillator circuits

Info

Publication number
GB2009547A
GB2009547A GB7847144A GB7847144A GB2009547A GB 2009547 A GB2009547 A GB 2009547A GB 7847144 A GB7847144 A GB 7847144A GB 7847144 A GB7847144 A GB 7847144A GB 2009547 A GB2009547 A GB 2009547A
Authority
GB
United Kingdom
Prior art keywords
oscillator
capacitor
frequency
charge
circuit
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.)
Granted
Application number
GB7847144A
Other versions
GB2009547B (en
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB7847144A priority Critical patent/GB2009547B/en
Publication of GB2009547A publication Critical patent/GB2009547A/en
Application granted granted Critical
Publication of GB2009547B publication Critical patent/GB2009547B/en
Expired legal-status Critical Current

Links

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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
    • 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
    • H03C3/222—Angle modulation by means of variable impedance by means of a variable reactive element the element being a semiconductor diode, e.g. varicap diode using bipolar transistors
    • 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
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/003—Circuit elements of oscillators
    • H03B2200/004—Circuit elements of oscillators including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor
    • 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
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode

Landscapes

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

Abstract

An oscillator circuit (Figure 2) has a varactor diode 4 for setting its frequency of oscillation. A limiter 5 limits the amplitude of oscillations of the circuit so the diode never becomes conductive allowing a capacitor C to be used to integrate a tuning current so the oscillator can be tuned according to the charge on the capacitor. A control system (Figure 3) using the charge tuned oscillator has two loops Figures A and B. A coarse control loop Figure 3A changes the capacitor until the oscillator frequency is approximately equal to a reference frequency. The other loop Figure 3B uses an operational transconductance amplifier OTA to charge and discharge the capacitor to more finely adjust the oscillator frequency. <IMAGE>
GB7847144A 1977-12-03 1978-12-05 Oscillator circuits Expired GB2009547B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7847144A GB2009547B (en) 1977-12-03 1978-12-05 Oscillator circuits

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5045477 1977-12-03
GB7847144A GB2009547B (en) 1977-12-03 1978-12-05 Oscillator circuits

Publications (2)

Publication Number Publication Date
GB2009547A true GB2009547A (en) 1979-06-13
GB2009547B GB2009547B (en) 1982-03-03

Family

ID=26266676

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7847144A Expired GB2009547B (en) 1977-12-03 1978-12-05 Oscillator circuits

Country Status (1)

Country Link
GB (1) GB2009547B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141466A2 (en) * 1983-11-07 1985-05-15 Koninklijke Philips Electronics N.V. Sampled costas loop
EP0971476A1 (en) * 1998-07-08 2000-01-12 STMicroelectronics SA Oscillator with two quadrature outputs

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141466A2 (en) * 1983-11-07 1985-05-15 Koninklijke Philips Electronics N.V. Sampled costas loop
EP0141466A3 (en) * 1983-11-07 1985-06-19 Koninklijke Philips Electronics N.V. Sampled costas loop
EP0971476A1 (en) * 1998-07-08 2000-01-12 STMicroelectronics SA Oscillator with two quadrature outputs
FR2781099A1 (en) * 1998-07-08 2000-01-14 St Microelectronics Sa OSCILLATOR HAVING TWO QUADRATURE OUTPUTS
US6124763A (en) * 1998-07-08 2000-09-26 Stmicroelectronics S.A. Oscillator with two outputs in quadrature
USRE38862E1 (en) 1998-07-08 2005-11-01 Stmicroelectronics S.A. Oscillator with two outputs in quadrature

Also Published As

Publication number Publication date
GB2009547B (en) 1982-03-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19951205