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Title: A near-threshold, multi-node, wireless body area sensor network powered by RF energy harvesting
Authors: Cheng, J.
Xia, L.
Ma, C.
Lian, Y. 
Xu, X.
Yue, C.P.
Hong, Z.
Chiang, P.Y.
Issue Date: 2012
Citation: Cheng, J.,Xia, L.,Ma, C.,Lian, Y.,Xu, X.,Yue, C.P.,Hong, Z.,Chiang, P.Y. (2012). A near-threshold, multi-node, wireless body area sensor network powered by RF energy harvesting. Proceedings of the Custom Integrated Circuits Conference : -. ScholarBank@NUS Repository.
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 V DD=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. © 2012 IEEE.
Source Title: Proceedings of the Custom Integrated Circuits Conference
ISBN: 9781467315555
ISSN: 08865930
DOI: 10.1109/CICC.2012.6330681
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