Circuit for correcting phase error of gyro sensor, gyro sensor system and method for correcting phase error of gyro sensor

A gyro sensor system, comprising:

• a gyro sensor for outputting a sensor output signal according to a movement of an object through a sensor electrode by receiving a driving signal;
• a signal processing unit for receiving the sensor output signal from the gyro sensor, separating a gyro signal component included in the sensor output signal and outputting as a gyro output signal;
• an offset detecting unit for detecting an offset due to a phase error included in the gyro output signal outputted from the signal processing unit;
• a variable frequency generating unit for generating a switching frequency varied according to the result detected in the offset detecting unit;
• and
• a phase correcting unit for receiving the sensor output signal of the gyro sensor, converting a phase thereof and supplying a gyro sensor driving signal to the gyro sensor by feedback, wherein the phase correcting unit includes a switched capacitor switched according to a switching frequency generated in the variable frequency generating unit and supplies the gyro sensor driving signal corrected the phase thereof according to a signal transmission characteristic of the switched capacitor as a demodulation signal for demodulating the gyro output signal in the signal processing unit.

A method for correcting a phase error of a gyro sensor, comprising:

• detecting an offset due to a phase error included in a gyro output signal outputted by being demodulated from an output of the gyro sensor;
• generating a switching frequency varied according to a result detected in detecting the offset;
• and
• supplying a gyro sensor driving signal from the output of the gyro sensor as a demodulation signal to demodulate the gyro output signal, wherein the gyro sensor driving signal being supplied as the demodulation signal is corrected in phase according to a signal transmission characteristics of a switched capacitor being switched according to the switching frequency.