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System and method for signaling in sensor devices

  • US 8,743,080 B2
  • Filed: 06/27/2011
  • Issued: 06/03/2014
  • Est. Priority Date: 06/27/2011
  • Status: Active Grant
First Claim
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1. A processing system for an input device, the processing system comprising:

  • transmitter module comprising transmitter circuitry, the transmitter module configured to simultaneously transmit a first transmitter signal with a first transmitter electrode and a second transmitter signal with a second transmitter electrode, wherein the first transmitter signal comprises a combination of a first heterodyne frequency and a carrier frequency and the second transmitter signal comprises a combination of a second heterodyne frequency and the carrier frequency;

    receiver module comprising receiver circuitry, the receiver module configured to receive a first resulting signal with a receiver electrode, wherein the first resulting signal comprises first effects corresponding to the first transmitter signal and second effects corresponding to the second transmitter signal; and

    a demodulating module configured to demodulate the first resulting signal to produce a plurality of demodulation signals, wherein the demodulating module comprises a first mixer, a second mixer, a third mixer, a first filter, a second filter and a third filter, wherein the first mixer comprises a mixing frequency corresponding to the carrier frequency, the second mixer comprises a mixing frequency corresponding to the first heterodyne frequency, and the third mixer comprises a mixing frequency corresponding to the second heterodyne frequency.

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