Circuitry for switching effective electrode area on a crystal in

Details Circuitry for switching effective electrode area on a crystal in Circuitry for switching effective electrode area on a crystal in

1980-09-17

1983-03-15

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

310315, 310366, 331163, 331176, 331177R, H03B 532, H03L 102

Patent

active

043769195

ABSTRACT:
An oscillator comprises plural electrodes formed on a piezoelectric vibrator, and the oscillation frequency is controlled by varying the duty factor of the pulses for switching an effective electrode area of the plural electrodes. The frequency-temperature characteristic of the oscillator is compensated by varying the duty factor of the switching pulses according to temperature variations.
No trimmer condenser is needed, and the frequency-temperature characteristic is compensated over a wide temperature range.

REFERENCES:
patent: 3568093 (1971-03-01), Ishida
patent: 4184095 (1980-01-01), Stacchiotti et al.

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