Patent ID: 7520184

Claim:
An angular velocity sensor comprising: a transducer; and a control circuit portion operable to drive the transducer and to detect an angular velocity applied to the transducer, wherein the transducer includes a drive electrode portion into which is inputted a drive signal to oscillate the transducer at a specific frequency, a monitor electrode portion operable to detect an oscillation frequency of the transducer and to output the detected oscillation frequency as a monitor signal, and a sense electrode portion operable to output a sense signal which is generated due to an angular velocity applied to the transducer and is synchronized with the monitor signal, and wherein the control circuit portion includes a correction circuit portion operable to: remove a noise signal component, caused by a mass balance of the transducer, of the sense signal detected erroneously, as if an angular velocity is occurring in the transducer due to the mass balance of the transducer when no angular velocity is occurring in the transducer, from a signal component of the sense signal; generate a correction signal by attenuating the monitor signal; and constantly remove the noise signal component from the sense signal by superimposing the generated correction signal on the sense signal.