In order to estimate the effect of noise on differential capacitance measurement circuit and in response to the needs of high precision accelerometer,analyze on the influence of noise sources in charging/discharging differential capacitance measurement circuit,set up the circuit noise model and equivalent acceleration noise formula of circuit is obtained. By measuring current circuit, the relation between measurement time difference and acceleration difference in open loop state is achieved,the order of magnitude of acceleration noise in circuit is deduced. Calculation results show that with g...
