Angular velocity sensor interface circuit and angular velocity detection apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorHideaki Sugibayashi
Life of this patent
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Abstract
An angular velocity detection apparatus includes an angular velocity detection signal amplifier circuit which amplifies an angular velocity detection signal Vo output from an angular velocity sensor, and an offset control circuit which controls an offset so as to be a reference voltage which is output when a value of an angular velocity is 0. The angular velocity detection apparatus further includes an input switch circuit which selects the reference voltage and a discharge switch circuit which short-circuits a capacitor included in a high-pass filter in an offset control period.
Claims6
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.
Dependencies are inferred from the claim text.