DC offset removal for a magnetic field sensor
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United States of America Patent
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Sep 18, 2012
Grant Date -
Aug 27, 2009
app pub date -
Feb 27, 2008
filing date -
Feb 27, 2008
priority date (Note) -
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Abstract
Presented is a sensor that includes a magnetoresistive (MR) sensing device to sense a magnetic field and to produce an AC signal voltage proportional to the sensed magnetic field. The sensor also includes circuitry, coupled to the MR sensing device, to remove DC offset from the AC signal voltage. The DC offset may be related to the hysteresis characteristics of the MR sensing device. To remove DC offset, the circuitry may obtain an averaged DC offset and subtract the averaged DC offset from the AC signal voltage to produce a sensor output signal.
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