3.EMG amplifier must have high gain, high input impedance, high CMRR and low noise because EMG signal itself is weak and interfered easily.

• 表面肌电信号本身幅值小、易受干扰，肌电信号放大器要求具有高放大倍数、高输入阻抗和高共模抑制比，同时又具有低噪声特性。