Low-Power Radios for Wireless Body Area Networks
Abstract:
Two important challenges leading to the ubiquitous use of wireless sensor nodes
in body area networks (BAN) are small size and low power consumption. Radio
power typically consumes the majority of the total power in a sensor node and
therefore is a significant bottleneck in energy-efficient design. This talk
will present recent results from ongoing research on ultra-low power WBAN
radios at the University of Michigan. Results from a measurement campaign of
the wireless channels around a body at 900MHz and 2.4GHz are shown and
distilled to reveal characteristics of WBAN channels that can be exploited for
reducing the power of wireless communication. A 100nW wake-up radio fabricated
in 130nm CMOS specifically targeting short-range communication will be
presented. This radio uses the 915MHz ISM band, and can achieve 100kb/s with a
sensitivity of -41dBm. Finally, an RF energy harvester optimized for
sensitivity and therefore wireless range will be presented. This chip is also
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bricated in 130nm CMOS for the 915MHz band, and by biasing the rectifier in the
subthreshold region, produces a 1V output from a received power of only -32dBm
(630nW).
Bio:
David D. Wentzloff received the B.S.E. degree in Electrical Engineering from
the University of Michigan in 1999, and the S.M. and Ph.D. degrees from MIT in
2002 and 2007, respectively. Since August, 2007 he has been with the University
of Michigan, Ann Arbor, where he is currently an Assistant Professor of
Electrical Engineering and Computer Science.
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