Patent ID: 7924109

Claim:
An MEMS oscillator comprising: an MEMS resonator configured to oscillate at a resonant frequency which is a function of a bias voltage applied to the MEMS resonator; a temperature sensor configured to output a signal indicative of a temperature of the MEMS resonator, wherein the signal from the temperature sensor has a voltage that changes proportionally to a change of the temperature; and a bias voltage controller configured to apply the bias voltage determined based on the signal from the temperature sensor, wherein the bias voltage controller comprises an amplifier configured to translate a deviation of the voltage of the signal from a reference voltage into the bias voltage to compensate the change of the resonant frequency caused by the change of the temperature, wherein the amplifier comprises: a first input terminal to which the signal from the temperature sensor is supplied; an output terminal connected to a reference voltage circuit via serially connected first and second resistors; and a second input terminal connected to a joint between the first and second resistors, wherein the reference voltage is a voltage at the joint, and the bias voltage is proportional to a difference between the voltage of the signal and the reference voltage multiplied by a ratio between the resistances of first and second resistors.