TY - GEN
T1 - A Complementary Pseudo-Resistor with Leakage Current Self-Compensation for Biopotential Amplifiers
AU - Topalli, Gerald
AU - Xie, Chong
AU - Fan, Yingying
AU - Luan, Lan
AU - Yin, Rongkang
AU - Chi, Taiyun
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - Conventional pseudo-resistors used in AC-coupled biopotential amplifiers suffer from intrinsic and photo-induced leakage currents, which may saturate the amplifier and induce an input-amplitude-dependent DC drift at the amplifier output. To mitigate these issues, this paper presents a new complementary pseudo-resistor with a leakage current self-compensation mechanism. As proof of concept, a capacitive feedback biopotential amplifier using the proposed pseudo-resistor is designed in the DB HiTek 180nm CMOS process. In the measurement, it achieves enhanced robustness against both input-amplitude-dependent DC drift and light exposure, compared to the amplifier using the conventional pseudo-resistor. It also demonstrates high signal fidelity during in vitro tests using pre-recorded neural signals.
AB - Conventional pseudo-resistors used in AC-coupled biopotential amplifiers suffer from intrinsic and photo-induced leakage currents, which may saturate the amplifier and induce an input-amplitude-dependent DC drift at the amplifier output. To mitigate these issues, this paper presents a new complementary pseudo-resistor with a leakage current self-compensation mechanism. As proof of concept, a capacitive feedback biopotential amplifier using the proposed pseudo-resistor is designed in the DB HiTek 180nm CMOS process. In the measurement, it achieves enhanced robustness against both input-amplitude-dependent DC drift and light exposure, compared to the amplifier using the conventional pseudo-resistor. It also demonstrates high signal fidelity during in vitro tests using pre-recorded neural signals.
KW - biopotential amplifier
KW - CMOS
KW - leakage current compensation
KW - neural recording
KW - pseudo-resistor
UR - https://www.scopus.com/pages/publications/85184869026
U2 - 10.1109/BioCAS58349.2023.10389136
DO - 10.1109/BioCAS58349.2023.10389136
M3 - Conference contribution
AN - SCOPUS:85184869026
T3 - BioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
BT - BioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Biomedical Circuits and Systems Conference, BioCAS 2023
Y2 - 19 October 2023 through 21 October 2023
ER -