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ASYNCHRONOUS INTERFERENCE DETECTION IN A CAPACITIVE SENSING SYSTEM

  • US 20160179243A1
  • Filed: 12/22/2014
  • Published: 06/23/2016
  • Est. Priority Date: 12/22/2014
  • Status: Active Grant
First Claim
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1. A processing system for a capacitive sensing device, comprising:

  • a sensor module comprising a receiver, coupled to a sensor electrode, configured to receive a capacitive sensing signal, the receiver including;

    an in-phase channel configured to mix the capacitive sensing signal with a local oscillator signal substantially in phase with the capacitive sensing signal; and

    a quadrature channel configured to mix the capacitive sensing signal with a phase-shifted signal near ninety degrees out of phase with the capacitive sensing signal; and

    a determination module configured to measure a change in capacitance in response to a demodulated signal of the in-phase channel concurrently with measuring a non-coherent signal in response to a demodulated signal of the quadrature channel.

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