In order to improve the control accuracy and stability of the driving mode of Coriolis vibration gyroscope,a closed-loop driving system of MEMS gyroscope based on DDS-PLL is designed.The digital phase-locked loop(PLL)based on direct digital frequency synthesizer(DDS)is used to track the resonant frequency and phase of gyro,and the digital automatic gain control(AGC)is used to control the driving amplitude stably.The experimental results show that the closed-loop driving system based on DDS algorithm can achieve higher control accuracy.The mean square error of the driving amplitude change is reduced to 0.0011 mV,the amplitude stability is 183 ppm,the mean square error of resonant frequency change is reduced to 0.07 Hz,and the frequency stability is 3.48 ppm.The precision of amplitude and frequency control of gyroscope driving mode is improved.
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