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

Siming Zuo, Hua Fan, Kianoush Nazarpour, Hadi Heidari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.
Original languageEnglish
Title of host publication2019 IEEE International Symposium on Circuits and Systems (ISCAS)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-5
Number of pages5
ISBN (Print)978-1-7281-0397-6
DOIs
Publication statusPublished - 1 May 2019
EventIEEE International Symposium on Circuits and Systems 2019 - Sapporo, Japan
Duration: 26 May 202029 May 2020
https://www.iscas2019.org/

Publication series

Name
PublisherIEEE
ISSN (Print)2158-1525

Symposium

SymposiumIEEE International Symposium on Circuits and Systems 2019
Abbreviated titleISCAS 2019
Country/TerritoryJapan
CitySapporo
Period26/05/2029/05/20
Internet address

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