A wireless 8-channel ECG biopotential acquisition system for dry electrodes

TitleA wireless 8-channel ECG biopotential acquisition system for dry electrodes
Publication TypeConference Paper
Year of Publication2012
AuthorsPu, X., L. Wan, Y. Sheng, P. Y. Chiang, Y. Qin, and Z. Hong
Conference Name2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)
Pagination140 - 142
Date Published11/2012
Conference LocationSingapore, Singapore
ISBN Number978-1-4673-2304-8

A wireless 8-channel biopotential acquisition system for capturing electrocardiogram (ECG) using dry electrodes is presented. The ECG system consists of copper electrodes, a micropowered 8-channel custom ASIC, and an off-the-shelf microprocessor and bluetooth radio. Each analog channel of the custom ECG front-end is composed of a chopper-modulated instrumentation amplifier (CMIA) with chopping spike filter (CSF), a programmable gain amplifier (PGA), and a output buffer. Implemented in standard a 0.35 μm CMOS technology, the ECG front-end consumes 101 μA from a 2.7 V supply, occupying 5 mm² of chip area. Measurement results show an input impedance of 1 G Ω, an input-referred noise of 0.97 μVrms (0.5 ~ 100 Hz), and a CMRR of 114 dB. Finally, a complete wireless 8-channel ECG monitoring system incorporating this analog front-end is demonstrated, showing successful recordings of a capture ECG waveform using a smart phone.