Print Email Facebook Twitter A 160μW 8-Channel Active Electrode System for EEG Monitoring Title A 160μW 8-Channel Active Electrode System for EEG Monitoring Author Xu, J. (TU Delft Electronic Instrumentation) Yazicioglu, Refet Firat (IMEC) Grundlehner, Bernard (Stichting IMEC Nederland) Harpe, Pieter (Eindhoven University of Technology) Makinwa, K.A.A. (TU Delft Electronic Instrumentation) Van Hoof, Chris (IMEC) Date 2011 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-assistedoffset 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-endcircuits 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. Subject ElektrotechniekTechniek To reference this document use: http://resolver.tudelft.nl/uuid:9f4c083d-5b67-488c-ada6-0c5876afcf60 DOI https://doi.org/10.1109/TBCAS.2011.2170985 ISSN 1932-4545 Source IEEE Transactions on Biomedical Circuits and Systems, 5 (6), 555-567 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2011 J. Xu, Refet Firat Yazicioglu, Bernard Grundlehner, Pieter Harpe, K.A.A. Makinwa, Chris Van Hoof Files PDF 1304850_TBCAS2170985.pdf 3.31 MB Close viewer /islandora/object/uuid:9f4c083d-5b67-488c-ada6-0c5876afcf60/datastream/OBJ/view