A low-noise high-linear wide dynamic-range MTJ-based magnetic field sensor

Yasser Rezaeiyan*, Nikolaj Lykkeberg Madsen, Tim Bohnert, Milad Zamani, Sonal Shreya, Elvira Paz, Hooman Farkhani, Ricardo Ferreira, Farshad Moradi

*Corresponding author for this work

Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review


Magnetic Tunnel Junction (MTJ) based sensors can function over a very wide range of magnetic fields, from pico tesla range to several milli-tesla. They have the potential to replace many currently used types of magnetic sensors in industrial and biomedical applications. This paper presents a readout channel using a double magneto-resistor (MR) bridge and a high-side current reference. The sensor system features offset cancellation and an intrinsic low-pass filter. The proposed magnetic sensor works with a linearity of better than 0.3% THD in a magnetic field range of ±0.5 mT and a bandwidth of 10 kHz. The measurement results show that the sensor input-referred noise power spectral density is 25.4 nVrms/√Hz at 100Hz equals 1.27 nT/√Hz.

Original languageEnglish
Title of host publication2023 IEEE Nordic Circuits and Systems Conference (NorCAS)
Number of pages4
Publication dateNov 2023
Publication statusPublished - Nov 2023
EventIEEE Nordic Circuits and Systems Conference - Denmark, Aalborg
Duration: 31 Oct 20231 Nov 2023


ConferenceIEEE Nordic Circuits and Systems Conference


  • Magnetic sensors
  • Readout channel
  • magnetic noise
  • magnetic tunnel junctions (MTJs)


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