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Group-Chopping: An 8-Channel, 0.04 Gain Mismatch, 2.1 W 0.017 mm<SUP>2</SUP> Instrumentation Amplifier for Bio-Potential Recording

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors

Tang, Tao; Park, Jeong Hoan; Zhang, Lian; Ng, Kian Ann; Yoo, Jerald

Issue Date
2022-06
Publisher
Institute of Electrical and Electronics Engineers
Citation
IEEE Transactions on Biomedical Circuits and Systems, Vol.16 No.3, pp.361-371
Abstract
An 8-channel AFE with a group-chopping instrumentation amplifier (GCIA) is proposed for bio-potential recording applications. The group-chopping technique cascades chopper switches to progressively swap channels and dynamically removes gain mismatch among all channels. An 8-phase non-overlapping clocking scheme is developed and achieves excellent betweenchannel gainmismatch characteristics. The dynamic offsets among all channels are mitigated by the GCIA as well. The GCIA is the first work that minimizes the gain mismatch across more than two channels. With the help of the group-chopping, combined with an area-efficient open-loop structure, the GCIA shows <0.04% between-channel gain mismatch, the lowest mismatch reported to date. The chip is fabricated in 0.18 mu m 1P6M CMOS, occupies only 0.017 mm(2)/Ch., consumes 2.1 mu W/Ch. under 0.5 V supply and achieves an NEF of 2.1.
ISSN
1932-4545
URI
https://hdl.handle.net/10371/200780
DOI
https://doi.org/10.1109/TBCAS.2022.3166513
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부교수
  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area Biomedical Applications, Energy-Efficient Integrated Circuits

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