Patent ID: 7205858

Claim:
A temperature-compensated piezoelectric oscillator comprising: a piezoelectric element: an amplifying circuit connected to a first end of the piezoelectric element; a variable capacitance element connected a second end of the piezoelectric element; a compensation voltage generation circuit for applying a voltage corresponding to a temperature to the variable capacitance element; and a temperature compensation data generation circuit for detecting the ambient temperature and for generating temperature compensation data corresponding to the detected temperature; wherein the compensation voltage generation circuit includes a first voltage generation circuit for appling to a first end of the variable capacitance element a first voltage that is variable depending on an ambient temperature and second voltage generation circuit for applying to a second end of the variable capacitance element a second voltage that is variable depending on the ambient temperature in a direction opposite to the first voltage; and each of the first and second voltage generation circuits includes a DA converter arranged to convert the temperature compensation data in a digital format into an analog signal.