Patent ID: 6912901

Claim:
An angular velocity sensor comprising: a sensor element including a driver part and a detector part for detecting an angular velocity; a driver circuit for supplying a driving signal to the driver part of said sensor element, wherein a monitor signal is output from said sensor element and coupled to said driver circuit; a detection unit including a charging amplifier and a synchronous detector, wherein an output from the detector part of said sensor element is applied to said charging amplifier, and wherein said synchronous detector receives both a signal synchronized with said driving signal and an output of said charging amplifier, said detection unit outputting an angular velocity signal; and a self diagnosis unit for detecting an abnormality of said sensor element and outputting a self diagnosis signal by coupling said signal synchronized with said driving signal to an input of said synchronous detector, wherein said self diagnosis unit comprises: an attenuator for attenuating the signal synchronized with said driving signal and a capacitor injecting the signal synchronized with said driving signal from said attenuator to a circuit, said circuit having an output coupled to said synchronous detector.