Patent ID: 8127607
Filing Date: 2012-03-06
Classification: G01C

Abstract:
1. An angular velocity sensor interface circuit comprising: a piezoelectric vibrator; a circuit arranged to drive the piezoelectric vibrator and to detect a voltage generated by vibration of the piezoelectric vibrator, and to output an angular velocity detection signal which is a voltage signal generated in accordance with an applied angular velocity to an angular velocity signal processing circuit; an angular velocity detection signal amplifier circuit arranged to amplify the angular velocity detection signal; an offset control circuit arranged to control an offset of the angular velocity detection signal amplifier circuit so that an output voltage of the angular velocity detection signal amplifier circuit is substantially equal to a reference voltage which is substantially equal to an output voltage when a value of the applied angular velocity is 0 in an offset control period after the angular velocity sensor interface circuit is activated; and an input switch circuit arranged to supply the reference voltage to the angular velocity signal processing circuit in the offset control period and to supply a signal output from the angular velocity detection signal amplifier circuit to the angular velocity signal processing circuit after the offset control period is terminated; wherein the input switch circuit is arranged between the angular velocity detection signal amplifier circuit and the angular velocity signal processing unit so as to be directly connected to the angular velocity detection signal amplifier circuit and to the angular velocity signal processing unit.