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Measurement and reporting of received signal strength in NFC enabled devices

  • US 9,413,430 B2
  • Filed: 04/16/2015
  • Issued: 08/09/2016
  • Est. Priority Date: 06/27/2011
  • Status: Active Grant
First Claim
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1. An NFC-enabled mobile device, comprising:

  • a field detector circuit configured to detect an NFC reader field based on a current induced within an antenna of the NFC-enabled mobile device;

    a receiver circuit configured to wake from a powered-down state in response to detection of the NFC reader field by the field detector circuit, the receiver circuit further configured to generate in-phase (I) and quadrature (Q) components of an incoming signal received from the NFC reader field;

    first circuitry configured to determine a strength of the incoming signal received from the NFC reader field based on the I and Q components generated;

    second circuitry configured to generate information representative of the determined strength at a first time; and

    third circuitry configured to generate a first user perceivable output representative of the determined strength of the incoming signal, the first user perceivable output configured to direct a user to improve the strength of the incoming signal.

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