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Measurement and reporting of received signal strength in NFC-enabled devices

  • US 9,042,814 B2
  • Filed: 06/27/2011
  • Issued: 05/26/2015
  • Est. Priority Date: 06/27/2011
  • Status: Active Grant
First Claim
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1. A method of operating an NFC-enabled device, comprising:

  • detecting, by a field detector circuit of the NFC-enabled device, an NFC reader field based on a current induced within an antenna of the NFC-enabled device;

    waking, in response to detecting the NFC reader field by the field detector circuit, a powered-down receiver circuit of the NFC-enabled device;

    generating by the receiver circuit, after waking the powered-down receiver circuit, in-phase (I) and quadrature (Q) components of an incoming signal received from the NFC reader field;

    determining a strength of the incoming signal received from the NFC reader field based on the I and Q components generated by the receiver circuit;

    generating, at the NFC-enabled device, information representative of the determined strength at a first time; and

    generating a first user perceivable output representative of the determined signal strength, the first user perceivable output configured to direct a user to spatially orient the NFC-enabled device to improve the strength of the signal received.

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