Patent ID: 8857259

Claim:
A reading circuit of a gyroscope, comprising: a driving unit, generating a resonance signal for a resonator of the gyroscope, and generating a demodulation signal; a high pass filter, having an input terminal for receiving an output signal of a Coriolis accelerometer of the gyroscope; a signal processing unit, coupled to the driving unit and the high pass filter, providing a modulation signal to the Coriolis accelerometer, and processing and demodulating an output of the high pass filter according to the demodulation signal to output a demodulation result, wherein the signal processing unit comprises: an integrator, having an input terminal coupled to an output terminal of the high pass filter; a comparator, having an input terminal coupled to an output terminal of the integrator, and comparing an output of the integrator with a threshold; a latch, having an input terminal coupled to an output terminal of the comparator, and latching an output of the comparator according to a clock signal; a demodulator, having a first input terminal coupled to an output terminal of the latch, a second input terminal coupled to the driving unit for receiving the demodulation signal, and an output terminal for outputting the demodulation result; and a modulation signal generator, coupled to the Coriolis accelerometer for providing the modulation signal; and a low pass filter, coupled to the signal processing unit and receiving the demodulation result.