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Sensor device and method for estimating noise in a capacitive sensing device

  • US 9,176,633 B2
  • Filed: 03/31/2014
  • Issued: 11/03/2015
  • Est. Priority Date: 03/31/2014
  • Status: Active Grant
First Claim
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1. A processing system configured to sense an input object in a sensing region of a sensing device, the processing system comprising:

  • a transmitter module coupled to a first transmitter electrode and a second transmitter electrode and configured to simultaneously apply a first transmitter signal to the first transmitter electrode and a second transmitter signal to the second transmitter electrode, wherein the first transmitter signal is based on a first one of a plurality of distinct codes and the second transmitter signal is based on a second one of the plurality of distinct codes; and

    a receiver module comprising receiver circuitry coupled to a first receiver electrode and configured to receive a first resulting signal with the first receiver electrode, the first resulting signal comprising effects corresponding to the first and second transmitter signals and a noise component;

    wherein the processing system is configured to determine an estimate of the noise component using a third one of the plurality of distinct codes which is not associated with a transmitter signal.

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