A 160μW 8-Channel Active Electrode System for EEG Monitoring

Journal article (2011)

Authors

J. Xu Electronic Instrumentation - EEMCS
B. Grundlehner Stichting IMEC Nederland
Pieter Harpe Eindhoven University of Technology
K.A.A. Makinwa Electronic Instrumentation - EEMCS
Kofi A.A. Makinwa Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2011 J. Xu, Refet Firat Yazicioglu, Bernard Grundlehner, Pieter Harpe, K.A.A. Makinwa, Chris Van Hoof
DOI: https://doi.org/10.1109/TBCAS.2011.2170985
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Published Date

2011

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents an active electrode system for gel-free biopotential EEG signal acquisition. The system consists of front-end chopper amplifiers and a back-end common-mode feedback (CMFB) circuit. The front-end AC-coupled chopper amplifier employs input impedance boosting and digitally-assisted
offset trimming. The former increases the input impedance of the active electrode to 2 G at 1 Hz and the latter limits the chopping induced output ripple and residual offset to 2 mV and 20 mV respectively. Thanks to chopper stabilization, the active electrode achieves 0.8 μVrms (0.5-100 Hz) input referred noise. The use of a back-end CMFB circuit further improves the CMRR of the active electrode readout to 82 dB at 50 Hz. Both front-end and back-end
circuits are implemented in a 0.18 μm CMOS process and the total current consumption of an 8-channel readout system is 88 μA from 1.8 V supply. EEG measurements using the proposed active electrode system demonstrate its benefits compared to passive electrode systems, namely reduced sensitivity to cable motion artifacts and mains interference.

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