DE3036785

An adjustable frequency crystal oscillator circuit has an adjustment capacitor which is connected in parallel, via a switching circuit, to a load capacitor of a piezoelectric vibrator. The oscillation frequency is controlled by varying the duty factor of the pulses applied to the switching circuit f...

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Bibliographic Details
Main Author KONNO, TETSURO, TOKIO/TOKYO, JP
Format Patent
LanguageEnglish
Published 28.11.1985
Edition4
Subjects
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Summary:An adjustable frequency crystal oscillator circuit has an adjustment capacitor which is connected in parallel, via a switching circuit, to a load capacitor of a piezoelectric vibrator. The oscillation frequency is controlled by varying the duty factor of the pulses applied to the switching circuit for switching the adjustment capacitor into and out of parallel connection with the load capacitor. The frequency-temperature characteristic is compensated for by varying the duty factor according to changes in temperature. No trimmer capacitor is needed, and the frequency-temperature characteristic is effectively compensated for over a wide temperature range.
Bibliography:Application Number: DE19803036785