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Usage of weighting matrices in multi-phase scanning modes

  • US 8,729,911 B2
  • Filed: 09/27/2012
  • Issued: 05/20/2014
  • Est. Priority Date: 04/19/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • driving concurrently a plurality of transmit (TX) signals in different sensing stages on a plurality of TX electrodes of a capacitance sense array, wherein each transmit (TX) signal has a different transmit phase and the different transmit TX phases are defined by an excitation matrix, wherein the excitation matrix is a weighting matrix and wherein the excitation matrix is a square matrix defined by the number of TX electrodes in the plurality of TX electrodes;

    measuring receive (RX) signals on a plurality of RX electrodes of the capacitance sense array; and

    determining if an object is proximate to the capacitance sense array based on the measured RX signals.

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