High-Precision Biomagnetic Measurement System Based on Tunnel Magneto-Resistive Effect

Zuo, S., Nazarpour, K. and Heidari, H. (2020) High-Precision Biomagnetic Measurement System Based on Tunnel Magneto-Resistive Effect. In: 2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Glasgow, Scotland, 23-25 Nov 2020, ISBN 9781728160443 (doi: 10.1109/ICECS49266.2020.9294789)

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Abstract

This paper presents a novel low-noise and high-precision readout circuit for tunnelling magnetoresistive (TMR) array to evaluate the suitability of biomagnetic measurement platform for detection of weak biomagnetic fields. We propose a three operational-amplifier architecture with a high input impedance and an adjustable gain for the fabricated TMR sensor that is highly miniaturized and can be operated at room temperature. The proposed system was designed using standard 0.18 µm CMOS technology and achieved a good performance with regard to gain, linearity, power consumption, and noise by employing a chopper stabilization technique and common mode feedback. The gain can reach 80 dB through adjusting two 5-bit programmable resistors and the input-referred noise voltage only has 44.6 nV/√Hz with 10 nA input bias over a wide range of frequency. Moreover, the whole readout dissipates 58 µW of power with a 1.8 V supply voltage. Benefiting from the CMOS compatibility of the TMR sensor, it offers monolithic integration directly on a silicon substrate as a TMR-on-chip sensing system. This will enable a new scientific and engineering paradigm to revitalize the biomagnetism field as an alternative way to understand the underlying mechanism of the human body.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Heidari, Dr Hadi and Zuo, Siming
Authors: Zuo, S., Nazarpour, K., and Heidari, H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
ISBN:9781728160443
Copyright Holders:Copyright © 2020 IEEE
First Published:First published in 2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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