Patent ID: 8570112

Claim:
A MEMS oscillator comprising: a feedback-type oscillation circuit including a MEMS resonator and an amplifier; a voltage control unit operable to control a bias voltage applied to an oscillating member of the MEMS resonator; and an auto gain control unit operable to receive an output from the amplifier and to output, to the amplifier, based on a level of the output from the amplifier, an amplitude control signal for increasing or decreasing a gain of the amplifier such that the level of the output from the amplifier comes to be a predetermined level, for controlling the gain of the amplifier; wherein the voltage control unit controls the bias voltage applied to the oscillating member of the MEMS resonator based on an operating temperature of the MEMS resonator such that a peak gain of the MEMS resonator comes to have a predetermined value regardless of a level of the operating temperature, and the voltage control unit derives the operating temperature of the MEMS resonator, by monitoring the amplitude control signal.