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Closed-loop sensor on a solid-state object position detector

  • US 7,609,253 B2
  • Filed: 10/26/2007
  • Issued: 10/27/2009
  • Est. Priority Date: 04/11/2002
  • Status: Expired due to Fees
First Claim
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1. A method for processing signals from a plurality of sensor electrodes in a closed loop sensor device comprising:

  • receiving a set of signals, the set of signals comprising a signal from each of the plurality of sensor electrodes in the closed loop sensor device;

    determining a set of capacitance values, the set of capacitance values comprising a capacitance value for each of the plurality of sensor electrodes from the set of signals;

    determining positional information of an input object proximate to the closed loop sensor device using the set of capacitance values, wherein the determining positional information of an input object comprises;

    determining a highest capacitance value sensor electrode of the plurality of sensor electrodes using the set of capacitance values;

    determining a quadratic fitting from a capacitance value of the highest capacitance value sensor electrode, a capacitance value of a first one of the plurality of sensor electrodes on a first side of the highest capacitance value sensor electrode, and a capacitance value of a second one of the plurality of sensor electrodes on a second side of the highest capacitance value sensor electrode;

    determining a center point of the quadratic fitting; and

    determining positional information from the center point; and

    generating an output based on the positional information.

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