| 摘要 |
PROBLEM TO BE SOLVED: To provide a resonator in which fluctuations in the resonance frequency is suppressed in spite of a change in ambient temperature. SOLUTION: A noninverting adder circuit A4 noninvertingly sums an output voltage from a temperature sensor 11 on the basis of the ambient temperature and a predetermined voltage, a variable voltage generating circuit G1, while receiving the voltage outputted from the temperature sensor 11 as a lower reference voltage and receiving an output voltage from the noninverting adder circuit A4 as an upper reference voltage, generates an output voltage from the lower reference voltage up to the upper reference voltage on the basis of input digital data and supplies the output voltage to a connecting point between varactor D1 and a capacitor C1 being components of a resonance circuit F1.
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