Adjustable frequency crystal oscillator with temperature compens

Details Adjustable frequency crystal oscillator with temperature compens Adjustable frequency crystal oscillator with temperature compens

1982-12-29

1986-04-15

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331176, 331177R, 331179, 310315, H03B 532, H03L 102

Patent

active

045830592

ABSTRACT:
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.

REFERENCES:
patent: 3568093 (1971-03-01), Ishida et al.

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