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QUADRATURE SIGNAL RECEIVER USING SYNCHRONIZED OSCILLATOR

  • US 20130021291A1
  • Filed: 03/29/2012
  • Published: 01/24/2013
  • Est. Priority Date: 07/19/2011
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a processing device;

    a signal generator coupled to the processing device and configured to generate a first signal; and

    a single receiver coupled to the processing device and configured to receive a second signal from a capacitive sense array, the single receiver comprising a first processing stream to process an in-phase component of the second signal and a second processing stream to process a quadrature component of the second signal, wherein the single receiver is configured to process the second signal for stylus sensing of a stylus proximate to the capacitive sense array in a first mode of operation and to process the second signal for touch sensing of a passive touch object proximate to the capacitive sense array in a second mode of operation, wherein the second signal is unsynchronized with the first signal in the first and second modes of operation.

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