GB1412718A - Circuit arrangement for stabilisung the freuqency in voltage-controlled oscillators - Google Patents

Circuit arrangement for stabilisung the freuqency in voltage-controlled oscillators

Info

Publication number
GB1412718A
GB1412718A GB3271473A GB3271473A GB1412718A GB 1412718 A GB1412718 A GB 1412718A GB 3271473 A GB3271473 A GB 3271473A GB 3271473 A GB3271473 A GB 3271473A GB 1412718 A GB1412718 A GB 1412718A
Authority
GB
United Kingdom
Prior art keywords
voltage
cref
operational amplifier
potentiometer
oscillator
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
GB3271473A
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Priority to GB3271473A priority Critical patent/GB1412718A/en
Publication of GB1412718A publication Critical patent/GB1412718A/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
    • H03L7/14—Details of the phase-locked loop for assuring constant frequency when supply or correction voltages fail or are interrupted
    • 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
    • H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1412718 APC systems LOEWE OPTA GmbH 10 July 1973 32714/73 Heading H3A An AFC circuit arrangement comprises a controlled oscillator 1 including a varicap diode 2, a pulse generator 9 for converting alternately the outputs of the oscillator 1, a reference generator 8 into corresponding D.C. voltage pulses which via a resistor 10 and a switch 6 charge up integrating capacitors C1, Cref. respectively, a first operational amplifier 11 for comparing the outputs of C1, Cref. to produce a differential output, a second operational amplifier 12 for comparing the above differential output with a variable reference voltage tapped from a tuning potentiometer 13 to produce a control voltage for oscillator 1. The arrangement may also include a third operational amplifier 15 supplied with the voltage across Cref. and a constant reference voltage tapped off potentiometer 13 for controlling the generator 9 in a manner to readjust the D.C. voltage across Cref. to a required valve, e.g. across R2 on potentiometer 13, independent of temperature and supply voltage variations. Thus the integrated voltages across C1, Cref. corresponding to the controlled and reference frequencies are affected equally by the above variations and a more stable output frequency is obtained from the loop. The range of output frequencies obtainable may be extended by use of appropriate mixers and frequency dividers preceding a switching circuit 5.
GB3271473A 1973-07-10 1973-07-10 Circuit arrangement for stabilisung the freuqency in voltage-controlled oscillators Expired GB1412718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3271473A GB1412718A (en) 1973-07-10 1973-07-10 Circuit arrangement for stabilisung the freuqency in voltage-controlled oscillators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3271473A GB1412718A (en) 1973-07-10 1973-07-10 Circuit arrangement for stabilisung the freuqency in voltage-controlled oscillators

Publications (1)

Publication Number Publication Date
GB1412718A true GB1412718A (en) 1975-11-05

Family

ID=10342926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3271473A Expired GB1412718A (en) 1973-07-10 1973-07-10 Circuit arrangement for stabilisung the freuqency in voltage-controlled oscillators

Country Status (1)

Country Link
GB (1) GB1412718A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2439527A1 (en) * 1978-10-16 1980-05-16 Licentia Gmbh REMOTE CONTROL ASSEMBLY, ESPECIALLY FOR BROADCASTING AND TELEVISION RECEIVERS
FR2439511A1 (en) * 1978-10-16 1980-05-16 Licentia Gmbh ASSEMBLY INCLUDING A REGULATION LOOP
GB2214371A (en) * 1986-12-23 1989-08-31 Austron Inc Fine tuning of atomic frequency standards
WO2001035533A1 (en) * 1999-11-08 2001-05-17 Mikron Aktiengesellschaft Für Integrierte Mikroelektronik Device and method for production of a clock signal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2439527A1 (en) * 1978-10-16 1980-05-16 Licentia Gmbh REMOTE CONTROL ASSEMBLY, ESPECIALLY FOR BROADCASTING AND TELEVISION RECEIVERS
FR2439511A1 (en) * 1978-10-16 1980-05-16 Licentia Gmbh ASSEMBLY INCLUDING A REGULATION LOOP
GB2214371A (en) * 1986-12-23 1989-08-31 Austron Inc Fine tuning of atomic frequency standards
GB2214371B (en) * 1986-12-23 1992-03-18 Austron Inc Fine tuning of atomic frequency standards
WO2001035533A1 (en) * 1999-11-08 2001-05-17 Mikron Aktiengesellschaft Für Integrierte Mikroelektronik Device and method for production of a clock signal
US6762648B1 (en) 1999-11-08 2004-07-13 Mikron Aktiengesellschaft Fur Integrierte Mikroelektronik Device and method for production of a clock signal

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19930709