A CMOS Analog Front-End for Tunnelling Magnetoresistive Spintronic Sensing Systems

Zuo, S., Fan, H., Nazarpour, K. and Heidari, H. (2019) A CMOS Analog Front-End for Tunnelling Magnetoresistive Spintronic Sensing Systems. In: 2019 IEEE International Symposium on Circuits and Systems (ISCAS), Sapporo, Japan, 26-29 May 2019, ISBN 9781728103976 (doi: 10.1109/ISCAS.2019.8702219)

180565.pdf - Accepted Version



This paper presents a CMOS readout circuit for an integrated and highly-sensitive tunnel-magnetoresistive (TMR) sensor. Based on the characterization of the TMR sensor in the finite-element simulation, using COMSOL Multiphysics, the circuit including a Wheatstone bridge and an analogue front-end (AFE) circuit, were designed to achieve low-noise and low-power sensing. We present a transimpedance amplifier (TIA) that biases and amplifies a TMR sensor array using switched-capacitors external noise filtering and allows the integration of TMR sensors on CMOS without decreasing the measurement resolution. Designed using TSMC 0.18 μm 1V technology, the amplifier consumes 160 nA at 1.8 V supply to achieve a dc gain of 118 dB and a bandwidth of 3.8 MHz. The results confirm that the full system is able to detect the magnetic field in the pico-Tesla range with low circuit noise (2.297 pA/√Hz) and low power consumption (86 μW). A concurrent reduction in the power consumption and attenuation of noise in TMR sensors makes them suitable for long-term deployment in spintronic sensing systems.

Item Type:Conference Proceedings
Additional Information:The work of Hua Fan was supported by the National Natural Science Foundation of China (NSFC) under Grant 61771111 and 61401066.
Glasgow Author(s) Enlighten ID:Zuo, Dr Siming and Heidari, Dr Hadi
Authors: Zuo, S., Fan, H., Nazarpour, K., and Heidari, H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Published Online:01 May 2019
Copyright Holders:Copyright © 2019 IEEE
First Published:First published in 2019 IEEE International Symposium on Circuits and Systems (ISCAS)
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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