A low input capacitance amplifier(LICA)is designed by using 0.5μm CMOS technology.The miller capacitor is cancelled by the positive feedback in the LICA.The influence of parasitic capacitance on sensitivity of accelerometer is analyzed
and a realization method of the interface circuit of open-loop accelerometer with LICA is presented.The simulation results demonstrate that using LICA is effective to improve the sensitivity of accelerometer.