An Ultra-High Input Impedance Analog Front End Using Self-Calibrated Positive Feedback

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This paper presents circuit techniques for ultra-high input impedance analog front end (AFE). In order to boost input impedance, various on- and off-chip parasitic capacitances are cancelled using an active shield and negative capacitance technique. To maximize the cancellation, a self-calibration scheme with active shield replica is proposed for positive feedback-based negative capacitance, which settles at the boundary between stable and unstable states in calibration mode. A prototype IC fabricated in 0.18-mu m CMOS achieves an input impedance of 50 G Omega at 50 Hz, equivalent to 60-fF capacitance, while consuming 289 nW from 0.8-V supply. The proposed AFE is applied to heart-rate monitoring using 1-cm(2) dry electrodes over clothes without any straps..
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2018-08
Language
English
Article Type
Article
Keywords

SENSOR

Citation

IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.53, no.8, pp.2252 - 2262

ISSN
0018-9200
DOI
10.1109/JSSC.2018.2831231
URI
http://hdl.handle.net/10203/244809
Appears in Collection
EE-Journal Papers(저널논문)
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