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Capacitive sensing using non-integer excitation

  • US 10,019,122 B2
  • Filed: 03/31/2016
  • Issued: 07/10/2018
  • Est. Priority Date: 03/31/2016
  • Status: Active Grant
First Claim
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1. A capacitive sensing device comprising:

  • a first transmitter electrode, a second transmitter electrode, and a plurality of receiver electrodes; and

    a processing system configured to;

    concurrently drive the first transmitter electrode with a first transmitter signal and the second transmitter electrode with a second transmitter signal,wherein the first transmitter signal is based on a first digital code and the second transmitter signal is based on a second digital code,wherein the first digital code and the second digital code each comprise at least one non-integer multiple, andwherein concurrently driving the first transmitter electrode and the second transmitter electrode comprises performing pre-emphasis based on the at least one non-integer multiple in the first digital code and the second digital code,receive a plurality of resulting signals using a plurality of receiver electrodes, the plurality of resulting signals comprising effects of the first transmitter signal and the second transmitter signal, anddetermine positional information based on the plurality of resulting signals.

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