Low-frequency noise in planar Hall effect bridge sensors

Anders Persson, R.S. Bejhedb, R.S. Bejhed, H. Nguyen, K. Gunnarsson, Bjarke Thomas Dalslet, Frederik Westergaard Østerberg, Mikkel Fougt Hansen, P. Svedlindh

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The low-frequency characteristics of planar Hall effect bridge sensors are investigated as function of the sensor bias current and the applied magnetic field. The noise spectra reveal a Johnson-like spectrum at high frequencies, and a 1/f-like excess noise spectrum at lower frequencies, with a knee frequency of around 400Hz. The 1/f-like excess noise can be described by the phenomenological Hooge equation with a Hooge parameter of γH=0.016. The detectivity is shown to depend on the total length, width and thickness of the bridge branches. The detectivity is improved by the square root of the length increase. Moreover, the detectivity is shown to depend on the amplitude of the applied magnetic field, revealing a magnetic origin to part of the 1/f noise.
    Original languageEnglish
    JournalSensors & Actuators: A. Physical
    Volume171
    Issue number2
    Pages (from-to)212-218
    ISSN0924-4247
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Detectivity
    • Magnetoresistance
    • Low-frequency noise
    • Planar Hall effect

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