A Biopotential Amplifier IC with Active Common-Mode Cancellation for Closed-Loop Neural Interfaces

Hyojun Yoo,Hyouk-Kyu Cha

doi:10.1109/isocc56007.2022.10031542

A Biopotential Amplifier IC with Active Common-Mode Cancellation for Closed-Loop Neural Interfaces

Hyojun Yoo, Hyouk-Kyu Cha

https://doi.org/10.1109/isocc56007.2022.10031542

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Publication Date: Oct 19, 2022

Affiliation: Seoul National University of Science and Technology

#Common-mode Artifact #Biopotential Amplifier + Show 8 more

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Abstract

This work presents a biopotential signal acquisition amplifier with feedforward common-mode (CM) artifact cancellation function to tolerate large stimulation artifacts in closed-loop neural interface systems. Designed using 180 nm CMOS process, the proposed amplifier is able to withstand up to 1 Vpp of stimulation artifact while achieving 20 dB closed-loop gain, 3.09 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mu$</tex> Vrms input referred noise, and noise efficiency factor of 1.87 over 10 kHz bandwidth. The total harmonic distortion for a 80-mVpp input at 1 kHz applied with 1-Vpp CM artifact at 900-Hz is -85.1 dB.

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