A Multichannel Wireless sEMG Sensor Endowing a 0.13 µm CMOS Mixed-Signal SoC

Abstract

This paper presents a wireless multichannel surface electromyography (sEMG) sensor which features a custom 0.13-μm CMOS mixed-signal system-on-chip (SoC) analog frontend circuit. The SoC includes 10x bioamplifiers, 10x 3rd order Delta-Sigma MASH 1-1-1 ADC, and 10x on-chip decimation filters. The sensor has an input-referred noise of 2.5 μVrms, an input-dynamic range of 6 mVpp, a programmable sampling rate of 2 ksps, for sEMG, while consuming only 7.1 μW/Ch for the SoC and 21.8 mW of power for the sensor (Transceiver, MCU, etc.). The system lies on a 1.5 x 2.0 cm² printed circuit board and weights < 1 g.