Piezoelectric-oscillator

Details Piezoelectric-oscillator Piezoelectric-oscillator

2004-08-03

2008-10-21

Pascal, Robert (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S03600C, C331S1160FE, C331S176000, C331S17700V, C257S312000

Reexamination Certificate

active

07439819

ABSTRACT:
Deterioration in frequency stability with time in a conventional piezoelectric oscillator using an accumulation type MOS capacitance element is improved. A P-channel transistor type or an N-channel transistor type is used as a MOS capacitance element in a variable capacitance circuit used in a piezoelectric oscillator. A bias voltage is applied between P-type or N-type extraction electrodes formed in source and drain regions and an N-type extraction electrode provided in an N-well region or a P-type extraction electrode provided in a P-well region. Instability in the MOS capacitance element with time is thus eliminated.

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