An interface circuit for resonant MEMS magnetic sensor is introduced

the circuit is composed of driving circuit and signal detection and processing circuit. Driving circuit uses direct digital frequency synthesizer（ DDS） to generate magnetic sensor driving signal. At the same time

it provides synchronizing signal for detection circuit. Signal detection and processing circuit demodulates output signal of magnetic sensor and synchronizing signal generated by DDS. Finally

magnetic field signal needed is obtained. Characteristics of circuit and results of test are analyzed.