Design Methodology of Biopotential Amplifier with Adaptive CM Cancelling Technique

DOI: https://doi.org/10.23075/jicas.2022.8.4.005
Keywords: Analog Front-end, Biopotential amplifier, Common-mode interference, Electrocardiogram(ECG), Wearable healthcare

Abstract

In this paper, the specifications of the previous biopotential amplifiers are reviewed in terms of maximizing the SNR. Based on the analysis, it is found out that the most important requirement for maximizing the SNR is the robustness to common-mode interference. In order to enhance both tolerance to CMI and T-CMRR simultaneously, a common-mode charge-pump(CMCP) and adaptive CMI cancelling loop are proposed in our previous work, where CMCP absorbs displacement current from the CMI source and adaptive CMI cancelling loop minimize the CMI shown at the amplifier output, respectively. Especially, the paper presents an analysis of the adaptive common-mode cancellation technique using an LMS algorithm that is dedicated for removing 50/60Hz noise during the biopotential recording.

Author Biographies

Nahm Il Koo, Korea Advanced Institute of Science and Technology

Nahmil Koo received the B.S. degree in electrical engineering from Hanyang University, Seoul, South Korea in 2016, and the M. S. degree and the Ph.D degree in electrical engineering from Korea Advanced Institute of science and technology, Daejeon, South Korea in 2018 and 2021, respectively. He is currently working for Samsung Advanced Institute of Technology in Suwon, South Korea. His main interests are integrated biomedical sensors and system, which includes ExG sensor, Bio-impedance sensor, and electrical impedance tomography (EIT) sensor.

Seong Hwan Cho, Korea Advanced Institute of Science and Technology

Seong Hwan Cho received the B.S. degree in electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 1995, and the M.S. and Ph.D. degrees in electrical engineering and computer science from the Massachusetts Institute of Technology, Cambridge, MA, USA, in 1997 and 2002, respectively. In 2002, he joined Engim, Inc., Acton, MA, USA, where he was involved in data converters and phased-locked loop design for the IEEE 802.11abg WLANs. From 2011 to 2012, he was a Research Scientist with Marvell, Inc., Santa Clara, CA, USA. From 2016 to 2017, he was a Research Scientist with Google, London, U.K. Since 2004, he has been with the Department of Electrical Engineering, KAIST, where he is currently a Professor. His current research interests include analog and mixed-signal circuits for low-power communication systems, health-care devices, and CMOS sensors. Dr. Cho has served on the Technical Program Committee for several IEEE conferences, including ISSCC, the Symposium on VLSI, and the Asian Solid-State Circuits Conference. He was a Distinguished Lecturer of the IEEE Solid-State Circuits Society. He was a co-recipient of the 2009 IEEE Transactions on Circuits and System Society Guillemin-Cauer Best Paper Award and the 2012 International Solid-State Circuits Conference (ISSCC) Takuo Sugano Award for Outstanding Far-East Paper. He has twice received the Outstanding Lecturer Award from KAIST. He was an Associate Editor of the IEEE JOURNAL OF SOLID-STATE CIRCUITS and the IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I.

Homepage : https://ccs.kaist.ac.kr/home

Published
2022-10-01
How to Cite
Koo, N. I., & Cho, S. H. (2022). Design Methodology of Biopotential Amplifier with Adaptive CM Cancelling Technique. Journal of Integrated Circuits and Systems, 8(4). https://doi.org/10.23075/jicas.2022.8.4.005
Issue
Vol 8 No 4 (2022)
Section
Articles