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Near field communication devices, systems, and methods using Q factor adjustments

  • US 9,596,003 B2
  • Filed: 03/06/2014
  • Issued: 03/14/2017
  • Est. Priority Date: 03/07/2013
  • Status: Active Grant
First Claim
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1. An NFC (near field communication) device comprising:

  • a resonance unit configured to generate a first voltage in response to an electromagnetic wave;

    a rectifier configured to generate a second voltage by rectifying the first voltage;

    a regulator configured to generate an internal voltage having a voltage level of a constant magnitude by using the second voltage to output the internal voltage to a first node; and

    a Q (quality) sink unit connected between the first node and a ground voltage, the Q sink unit being turned on to reduce a Q factor (quality factor) of the resonance unit when a signal receive operation is performed in a card mode, and being turned off to maintain the Q factor in a reader mode and when a signal transmit operation is performed in the card mode.

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