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RECEIVER CIRCUIT AND METHOD FOR A CONTACTLESS IDENTIFICATION SYSTEM

  • US 20030085278A1
  • Filed: 11/08/2001
  • Published: 05/08/2003
  • Est. Priority Date: 11/08/2001
  • Status: Active Grant
First Claim
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1. A receiver circuit for a contactless identification system, comprising:

  • an antenna receiving an amplitude modulated signal;

    a voltage envelope detector connected to the antenna;

    a current envelope detector connected to the antenna;

    a first comparator having a first input connected to an output of the voltage envelope detector and a second input connected to a threshold;

    a second comparator having a first input connected to an output of the current envelope detector and a second input connected to the threshold; and

    a logic gate combining an output of the first comparator and an output of the second comparator.

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