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Continuous time anti-alias filter for capacitive touch sensing

  • US 10,228,797 B2
  • Filed: 09/14/2016
  • Issued: 03/12/2019
  • Est. Priority Date: 09/14/2015
  • Status: Active Grant
First Claim
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1. A method for sensing an input device, comprising:

  • receiving a signal with a capacitive sensor electrode;

    forwarding the signal to a low-impedance input of a current conveyor configured to provide a virtual ground at the low-impedance input;

    outputting a current to an anti-aliasing filter;

    filtering the current with the anti-aliasing filter to produce an anti-aliased signal, the anti-aliasing filter having an output and comprising a continuous time analog infinite impulse response filter; and

    integrating the anti-aliased signal with a charge integrator having an input, wherein the output of the anti-aliasing filter is directly connected to the input of the charge integrator.

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