A 0.5-V Sub-10-mu W 15.28-m Omega/root Hz Bio-Impedance Sensor IC With Sub-1 degrees Phase Error

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Continuous monitoring of fluid status through bio-impedance (Bio-Z) measurement of thoracic magnitude or phase is critical in reducing the mortality of chronic heart failure (CHF) patients. However, the stringent power constraints of implantable devices force the design of Bio-Z sensors to be highly challenging. We present a sub-10-mu W Bio-Z sensor IC operating from a 0.5 V-supply, sustaining a sub-1 degrees of phase error even under 10% of supply and 0 degrees C-70 degrees C of temperature variations. Fabricated in a 65-nm CMOS process, this sensor IC exhibits a 15.28-m Omega/root Hz of input-referred impedance noise performance, occupying a 4.83 mm(2). Its linearity performance shows that the magnitude and the phase of Bio-Z can be measured within the error of 2% and 0.4 degrees, respectively, given that the magnitude of load impedance is less than 126 Omega, and thus, it is suitable for fluid status monitoring applications. Experimental measurement on the human chest demonstrates its capabilities of thoracic impedance variance (TIV) and impedance cardiography (ICG) monitoring.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2020-08
Language
English
Article Type
Article
Citation

IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.55, no.8, pp.2161 - 2173

ISSN
0018-9200
DOI
10.1109/JSSC.2020.2991511
URI
http://hdl.handle.net/10203/281950
Appears in Collection
EE-Journal Papers(저널논문)
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