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Touch receiving channel re-use scheme with receiver signal coding

  • US 9,690,432 B2
  • Filed: 10/21/2013
  • Issued: 06/27/2017
  • Est. Priority Date: 10/21/2013
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a sense amplifier comprising a positive terminal and a negative terminal;

    switching circuitry for receiving a plurality of touch signals from a plurality of sense electrodes of a touch sensor panel, wherein the switching circuitry is operable to selectively couple each of the plurality of sense electrodes to the positive terminal of the sense amplifier or the negative terminal of the sense amplifier based on a matrix;

    an analog-to-digital converter coupled to receive an output of the sense amplifier; and

    decoding circuitry coupled to receive an output of the analog-to-digital converter, wherein the decoding circuitry is operable to decode the output of the analog-to-digital converter using an inverse of the matrix to generate a plurality of output signals that are representative of the plurality of touch signals.

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