A near-threshold, multi-node, wireless body area sensor network powered by RF energy harvesting

TitleA near-threshold, multi-node, wireless body area sensor network powered by RF energy harvesting
Publication TypeConference Paper
Year of Publication2012
AuthorsCheng, J., L. Xia, C. Ma, Y. Lian, X. Xu, P. C. Yue, Z. Hong, and P. Y. Chiang
Conference Name2012 IEEE Custom Integrated Circuits Conference - CICC 2012
Pagination1 - 4
Date Published09/2012
PublisherIEEE
Conference LocationSan Jose, CA
ISBN Number978-1-4673-1554-8
Abstract

A wirelessly-powered, near-threshold, body area network SoC supporting synchronized multi-node TDMA operation is demonstrated in 65nm CMOS. A global clock source sent from a base-station wirelessly broadcasts at 434.16MHz to all sensor nodes, where each individual BAN sensor is phase-locked to the base-station clock using a super-harmonic injection-locked frequency divider. Each near-threshold SoC harvests energy from and phase locks to this broadcasted 434.16MHz waveform, eliminating the need for a battery. A Near-VT MICS-band OOK transmitter sends the synchronized local sensor data back to the base-station in its pre-defined TDMA slot. For an energy-harvested local VDD=0.56V, measurements demonstrate full functionality over 1.4m between the base-station and four worn sensors, including two that are NLOS. The sensitivity of the RF energy harvesting and the wireless clock synchronization are measured at -8dBm and -35dBm, respectively. ECG Lead-II/Lead-III waveforms are experimentally captured, demonstrating the end-to-end system application.

Notes

Best poster award.

DOI10.1109/CICC.2012.6330681