| 摘要 |
Vibration gyro circuitry, a vibration gyro unit, and a method for detecting a vibration gyro output, which enable detection of a rotational angular velocity with high sensitivity, are provided. The circuitry and the unit includes a differential amplifier circuit ( 4 ) for outputting a signal Vda corresponding to a difference (Vgl-Vgr) between output signals of two detection pieces of a vibration gyro ( 31 ), a synchronous detection circuit ( 5 ) for synchronously detecting the output signal Vda of the differential amplifier circuit ( 4 ), and a phase shift circuit for supplying to the synchronous detection circuit ( 5 ) a signal, as a timing signal Vck for the synchronous detection, which is phase-shifted with respect to a drive signal (an output signal of an adding circuit 1 ) Vsa supplied to the vibration gyro ( 31 ). The phase difference thetaps between the drive signal Vsa and the timing signal Vck is set on the basis of a phase difference characteristic of a detection sensitivity S for the output signal Vda of the differential amplifier circuit ( 4 ), which is obtained in advance under a condition where a rotational angular velocity is applied to the vibration gyro ( 31 ) in a driving state.
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