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TOUCH SENSING APPARATUS AND TOUCH SENSING METHOD

  • US 20160004347A1
  • Filed: 04/16/2015
  • Published: 01/07/2016
  • Est. Priority Date: 07/01/2014
  • Status: Abandoned Application
First Claim
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1. A touch sensing apparatus comprising:

  • an excitation source, arranged to generate an excitation signal having a first frequency;

    a capacitor under test, arranged to receive the excitation signal, and generate a sensing signal;

    a sampling circuit, arranged to sample the sensing signal to generate a digital output, the sampling circuit comprising a pulse density modulation (PDM) unit that has an input end coupled to the capacitor under test,the pulse density modulation unit sampling a signal received at the input end with a second frequency to generate the digital output, wherein the second frequency is higher than the first frequency; and

    a filter, coupled to the pulse density modulation unit, the filter arranged to filter the digital output to generate a filtered signal.

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