Patent ID: 9077283
Filing Date: 2015-07-07
Classification: G01C,H03D

Abstract:
1. A self-oscillation circuit having a means for eliminating a quadrature error, comprising: a gyroscope sensor receiving a driving signal to output a current signal; a sensor driver outputting a signal for driving the gyroscope sensor; a voltage converter converting a current signal from the gyroscope sensor into a voltage signal; a signal magnitude detector measuring a magnitude of a quadrature error signal included in an output signal from the voltage converter; a quadrature error eliminator generating a signal which has the same phase as the output signal from the voltage converter and the same magnitude as a signal measured by the signal magnitude detector, based on an output signal from the signal magnitude detector and the output signal from the voltage converter; a subtractor outputting a signal obtained by subtracting an output signal from the quadrature error eliminator from the output signal from the voltage converter; a phase converter converting a phase of the output signal from the voltage converter; and a demodulator performing a demodulation to an original signal output from the gyroscope sensor, based on the output signal from the phase converter and an output signal from the subtractor.