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Integrated capacitance model circuit

  • US 8,432,170 B1
  • Filed: 06/28/2012
  • Issued: 04/30/2013
  • Est. Priority Date: 03/14/2012
  • Status: Active Grant
First Claim
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1. An integrated circuit comprising:

  • a capacitance-sensing device disposed on an common carrier substrate of the integrated circuit; and

    a capacitance model circuit disposed on the common carrier substrate, wherein the capacitance model circuit is configured to model a capacitance of an external sense array, and wherein the capacitance model circuit is programmable, wherein the capacitance model circuit comprises;

    an input comprising a switch coupled to receive a transmit (TX) signal;

    an output comprising a plurality of switches coupled to output a receive (RX) signal; and

    a plurality of programmable capacitors coupled to at least one of the input or output, wherein the plurality of programmable capacitors comprises;

    a first set of one or more capacitors coupled between the input and output;

    a first set of one or more switches, each coupled to one of the first set of capacitors to turn on and off the corresponding capacitor;

    a second set of one or more capacitors coupled between a ground potential and the output; and

    a second set of one or more switches, each coupled to one of the second set of capacitors to turn on and off the corresponding capacitor.

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