A 0.5-mu V-rms 12-mu W Wirelessly Powered Patch-Type Healthcare Sensor for Wearable Body Sensor Network

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A wirelessly powered patch-type healthcare sensor IC is presented for a wearable body sensor network (W-BSN) to continuously monitor personal vital signals. Thick-film electrodes are screen printed on a fabric by planar-fashionable circuit board (P-FCB) technology on which stainless steel powder with a grain size of 100 mu m is added to reduce both contact impedance as well as motion artifacts. A nested chopped amplifier (NCA) is designed and optimized for the proposed patch-type healthcare sensor with a reduced electrode referred noise of 0.5 mu V-rms. A programmable gain and bandwidth amplifier (PGA) stage is also implemented to accommodate various dynamic ranges of vital signals. A 10-b folded successive approximation register (SAR) analog-to-digital converter (ADC) reduces capacitive digital-to-analog conversion size by 94% and relaxes the power budget of the ADC driver by 36%. Measured sensor resolution is 9.2 b and rejects common-mode interference larger than 100 dB while consuming only 12 mu W of power supplied wirelessly. A 2.0 mm x 1.3 mm sensor IC is fabricated in 0.18-mu m 1P6M CMOS technology. The chip is directly integrated between two screen printed electrodes and stacked by a screen printed fabric inductor. With the proposed patch-type sensor, personal healthcare without expensive batteries is possible in W-BSN and greatly improves wearability and convenience in use.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2010-11
Language
English
Article Type
Article; Proceedings Paper
Keywords

INSTRUMENTATION AMPLIFIER; SYSTEMS

Citation

IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.45, pp.2356 - 2365

ISSN
0018-9200
URI
http://hdl.handle.net/10203/98720
Appears in Collection
EE-Journal Papers(저널논문)
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