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Analog front-end measuring biopotential signal with effective offset rejection loop

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 4th International Conference on Biomedical Engineering and Biotechnology, 18–21 August 2015, Shanghai, China

Guest editors: Feng Liu, Dong-Hoon Lee, Ricardo Lagoa and Sandeep Kumar

Article type: Research Article

Authors: Lim, Seunghyuna | Kim, Hyunhoa | Song, Haryonga | Cho, Dong-il “Dan”b | Ko, Hyounghoa; *

Affiliations: [a] Department of Electronics, Chungnam National University, Daejeon 305-764, Korea | [b] School of Electrical Engineering, ASRI/ ISRC, Seoul National University, Seoul 151-744, Korea

Correspondence: [*] Address for correspondence: Hyoungho Ko, Department of Electronics, Chungnam National University, Daejeon 305764, Korea. Tel.: +82-42-821-5664; Fax: +82-42-823-5436; E-mail: hhko@cnu.ac.kr.

Keywords: Biopotential analog front-end (AFE), electroencephalograph (EEG), electrocardiogram (ECG), ripple reduction loop, DC servo loop

DOI: 10.3233/BME-151387

Journal: Bio-Medical Materials and Engineering, vol. 26, no. s1, pp. S935-S941, 2015

Published: 2015
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This paper presents an analog front-end (AFE) IC design for recording biopotential signals. The AFE employs a capacitively coupled instrumentation amplifier to achieve a low-noise and high-common mode rejection ratio (CMRR) system. A ripple reduction loop is proposed to reduce the ripple generated by the up-modulating chopper. The low frequency noise is attenuated by an input AC coupling capacitor, and is attenuated again by a DC servo loop. The proposed AFE features a differential gain of 71 dB, and a CMRR of 89 dB, at 50 Hz. Furthermore, the proposed AFE can robustly acquire biopotential signals even in the presence of an input offset and ripples.

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