0.3 V ultra-low power sensor interface for EMG

A low-voltage, ultra-low power sensor interface for electromyogram (EMG) signal acquisition is presented. The sensor interface consists of an amplifier and a SAR ADC that work from a 0.3V supply. The low-voltage amplifier topology provides a noise level of 26μVrms, 40dB gain and a state-of the art power efficiency factor (PEF) of 2.2 from a 20-425Hz bandwidth. Low-voltage supply improves the power efficiency of the amplifier compared with previous ultra-low power work. Together with the ADC, the prototype implemented in 65nm CMOS process consumes 3.8nW and has an area of 0.22mm
²
, which makes the sensor interface suitable for wearable IoT nodes as well as implantable devices.