The precision loss which exists in the output current to the digital conversion of the traditional analog accelerometer can be solved by the digital closed-loop accelerometer

while in order to realize the digital closed-loop

header of accelerometer should be discretized.Thus a method for overall discretizing the quartz pendulum plate

sampling switch and zero-order holder is put forward.The mathematical model of discrete domain of digital closed-loop is set up

based on this model

the feasibility of the method is verified.The simulation results show that the system overshoot can be controlled at about 10 %

and the closed-loop bandwidth can reach above 300 Hz.Then the model is applied to the experimental system of digital closed-loop accelerometer and the simulation results are verified

which provides the necessary theoretic instruction and experimental basis for the further study on the digital closed-loop accelerometer.