Acceleration sensor circuit

An acceleration sensor circuit comprising:

• an acceleration sensor including a first capacitor whose capacitance changes according to a position of a first movable electrode, and a second capacitor whose capacitance changes as opposed to the first capacitor according to a position of a second movable electrode moved together with the first movable electrode;
• a first circuit for generating a sinusoidal AC signal of a predetermined frequency for being applied to the first capacitor and the second capacitor in mutually opposite phases;
• a second circuit for generating a signal according to the positions of the first movable electrode and the second movable electrode based on a difference between a capacitance of the first capacitor and a capacitance of the second capacitor and the sinusoidal AC signal applied to the first capacitor and the second capacitor;
• and
• an arithmetic circuit for analyzing data in which a signal generated by the second circuit is encoded, extracting a signal of a frequency component of substantially the same frequency as the predetermined frequency from the data, and outputting data of acceleration based on the extracted signal.