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High dynamic range digital fluxgate magnetometer

  • US 5,939,881 A
  • Filed: 11/13/1997
  • Issued: 08/17/1999
  • Est. Priority Date: 11/13/1997
  • Status: Expired due to Fees
First Claim
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1. Sensing apparatus comprising:

  • a sensor comprising a feedback input, and a sense output that outputs an error signal indicative of the difference between a signal sensed by the sensor and a feedback signal input to the feedback input;

    a comparator coupled to the sense output of the sensor;

    a register coupled to the comparator that outputs a logical 1 or a logical 0 in accordance with the output of the comparator;

    a digital filter coupled to the signal output of the register, for producing a digital output of the sensing apparatus;

    a digital clock having a clock signal output coupled to clock inputs of the register and the digital filter; and

    a high resolution digital to analog converter and analog low pass filter coupled between the register and the feedback input of the sensor for supplying the feedback signal thereto.

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