Apparatus using a differential analog-to-digital converter

  • US 8,253,706 B2
  • Filed: 06/26/2009
  • Issued: 08/28/2012
  • Est. Priority Date: 06/26/2009
  • Status: Active Grant
First Claim
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1. A method comprising:

  • acquiring a first response from an output line of a matrix touch screen, the first response being a capacitively induced signal derived from a rising edge of a pulse applied to an input line of the matrix touch screen;

    acquiring a second response from the output line of the matrix touch screen, the second response being a capacitively induced signal derived from a falling edge of the pulse applied to the input line of the matrix touch screen; and

    manipulating the first response and the second response to reject noise at frequencies less than a frequency associated with the pulse.

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