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Continuously calibrated magnetic field sensor

  • US 7,746,065 B2
  • Filed: 09/14/2005
  • Issued: 06/29/2010
  • Est. Priority Date: 09/16/2004
  • Status: Active Grant
First Claim
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1. Magnetic field sensor comprising a reference magnetic field generator, a magnetic field sensing cell including a magnetic field sensing element, and a signal processing circuit connected to an output of the magnetic field sensing cell and comprising one or more feedback lines for correcting error fluctuations in the transfer characteristic of the magnetic field sensor, the reference magnetic field generator adapted to generate a frequency modulated reference magnetic field, wherein the signal processing circuit further includes a modulator connected to the magnetic field sensing cell, the modulator modulating the output signal thereof at a frequency different from the modulation frequency of the reference magnetic field generator.

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