Patent ID: 6220094
Filing Date: 2001-04-24
Classification: G01C

Abstract:
An angular velocity sensor driving circuit comprising:a) a driving part for providing vibration to a vibrator;b) a vibration level detector for detecting a vibration level of said vibrator;c) a coriolis force detector for detecting a coriolis force generated according to an angular velocity;d) a first amplifier for amplifying an output signal of said vibration level detector;e) a rectifying circuit for rectifying an output signal of said first amplifier;f) a variable gain amplifier receiving an output signal of said first amplifier and varying a gain of said variable gain amplifier according to an output voltage of said rectifying circuit;g) a voltage amplifier receiving the output signal of said variable gain amplifier, the voltage amplifier supplying an output signal to said driving part as a driving signal for said driving part;h) a level judging circuit which compares the output signal of said rectifying circuit and a reference voltage; andswitching means for varying at least one of the gain of said variable gain amplifier and a gain of said voltage amplifier responsive to an output signal of said level judging circuit.