Non-contact Low Power EEG/ECG Electrode for High Density Wearable Biopotential Sensor Networks

• Published in: 2009 Sixth International Workshop on Wearable and Implantable Body Sensor Networks pp. 246 - 250
• Main Authors: Chi, Yu.M., Deiss, S.R., Cauwenberghs, G.
• Format: Conference Proceeding
• Language: English; Japanese
• Published: IEEE 01.06.2009
• Subjects: Biomedical monitoring; Biosensors; body sensor; Body sensor networks; capacitive sensor; Capacitive sensors; ecg; eeg; Electrocardiography; Electrodes; Electroencephalography; Operational amplifiers; Wearable sensors; Wireless sensor networks
• ISBN: 9780769536446; 0769536441
• ISSN: 2376-8886
• DOI: 10.1109/BSN.2009.52

A non-contact capacitive biopotential electrode with a common-mode noise suppression circuit is presented. The sensor network utilizes a single conductive sheet to establish a common body wide reference line, eliminating the need for an explicit signal ground connection. Each electrode senses the local biopotential with a differential gain of 46 dB over a 1-100 Hz bandwidth. Signals are digitized directly on board with a 16-bit ADC. The coin sized electrode consumes 285 ¿A from a single 3.3 V supply, and interfaces with a serial data bus for daisy-chain integration in body area sensor networks.