A novel design of closed-loop drive of MEMS gyroscope based on LADRC controller

Microelectromechanical systems (MEMS) gyroscopes have stringent requirements in terms of control accuracy and system stability. The traditional PI control is widely used in the closed-loop drive loop of MEMS gyroscopes, but the parameters need to be finely tuned to achieve optimal performance. In order to simplify the complexity of parameter tuning and improve the stability and anti-interference ability of the system, a MEMS gyroscope driving closed-loop system based on Linear Active Disturbance Rejection Control (LADRC) is proposed in this paper. The demodulated output signals with the same reference amplitude are inputted to the LADRC controller to predict the tracking total perturbation, and the control signals are generated to drive the system. Simulation results show that the phase margin of the system is significantly improved by using the LADRC controller approach, the stabilisation time is improved by a factor of 7.5 and the phase margin is improved by a factor of 45°. Simulation results show that the LADRC control contributes to the stability of the control system compared to the PI controlled approach. The simulation further verifies that a wide range of changes in the parameters of the LADRC controller does not affect the system stability, but improves the system's anti-interference capability.