Research On Micromachined Gyro Drive Control And Its Noise

With the development of advanced microelectronic technology,the application market of micro-mechanical gyro is more and more extensive,and the accuracy requirements for gyro are getting higher and higher.The stable micro-mechanical drive control system is a necessary condition for high precision of the gyro,but the classical PID control and self-oscillation control at the current stage have the disadvantages of low precision and poor stability of the micromechanical gyro drive control.The gyro's drive control system is improved,and the fuzzy control algorithm is applied to the micro-mechanical gyro drive closed-loop control.The method and circuit design of MEMS gyro drive closed-loop control based on fuzzy control is completed.Combined with the research status at home and abroad,the driving closed loop of the micromachined gyroscope is characterized by a non-time-varying nonlinear system.Classical PID control theory is no longer suitable for complex nonlinear systems.An improved fuzzy control drive closed-loop strategy is proposed,which is implemented on the FPGA platform and further improves the gyro drive signal processing within the chip.The improved fuzzy control is a combination of traditional fuzzy control and PID,which integrates the advantages of both,has faster control ability,higher control precision and stronger robustness.The experimental results show that the design method can make the MEMS gyro work stably in the resonant state,the response signal amplitude is basically kept constant,and the digital drive closed-loop response signal amplitude jitter accuracy can reach 98 ppm.In the micro-mechanical gyro design,the overall scheme of the specific circuit design of the gyro drive control system is designed to design a suitable analog circuit to improve the performance of the gyro drive.Design and analyze the micro-mechanical gyro drive circuit design,electrostatic comb drive circuit,weak signal detection circuit,carrier circuit and PC communication system that constitute the whole circuit,to design a complete peripheral drive control circuit to achieve constant gyro response signal amplitude..And the whole circuit is simulated and debugged to realize the communication between the host computer and the experiment board.The noise model of the micro-mechanical gyro drive circuit is established,and the main noise in the circuit is analyzed to establish a model of the two-port network to make the internal noise of the network equivalent to the input.The circuit simulation analysis is studied by using matlab software and multisim software.According to the circuit to solve the noise to make reference to the electronic device selection of the key circuits in the circuit and the influence of the digital-to-analog converter and the analog-to-digital converter on the signal,it provides a basis for the optimization of the circuit,and has certain practical application value.