Patent ID: 7779688
Filing Date: 2010-08-24
Classification: G01C

Abstract:
1. A vibration gyro sensor, comprising: a vibrating element; a pair of drive electrodes for driving the vibrating element; at least two detection electrodes for detecting Coriolis force applied to the vibrating element; a monitor circuit coupled with one of the pair of drive electrodes, so as to output a monitor signal; a drive circuit for amplifying the monitor signal so as to output an amplified signal to the other of the pair of drive electrodes; a differential amplifier circuit for differentially amplifying at least two signals obtained from the detection electrodes of the vibrating element, so as to output a differential amplified signal; a synchronous detection circuit for synchronously detecting the differential amplified signal with respect to the monitor signal, so as to output a detected signal; a filter circuit for outputting a filtered signal in which a noise of the detected signal is removed; and a ratiometric circuit which receives the filtered signal and outputs a sensitivity signal whose amplitude is proportional to variation of a power voltage.