Low-Noise EEG Sensor and Neural Stimulator : For Motion and Stimulation Artifact Removal

Abstract

This work aims to develop a neural interface system that enables electroencephalogram (EEG) measurement in wearable equipment and eliminates stimulation artifacts by processing in miniaturized neural stimulation modules. The ASIC implements a 4-channel analog-front-end (AFE) with a high input-Z buffer, 2^nd order oversampling delta-sigma ADC, stimulation noise cancellation digital processors, and digitally controlled neural stimulators into the chip. The simplified stimulation artifact rejection algorithm implemented on the digital block allows users to acquire pure neural signals while stimulating. The 3 mm x 1 mm IC chips were fabricated through the TSMC 65 nm LP process.