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RFID tags combining signals received from multiple RF ports

  • US 7,423,539 B2
  • Filed: 08/26/2005
  • Issued: 09/09/2008
  • Est. Priority Date: 03/31/2004
  • Status: Active Grant
First Claim
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1. A circuit for use in an RFID tag, comprising:

  • a first RF port for receiving a first signal;

    a second RF port for receiving a second signal;

    a signal combiner for generating a combined signal from the first received signal and the second received signal; and

    an analog to digital converter for generating a digital signal from the combined signal,wherein the signal combiner includesa first envelope detector for generating a first processed signal from the first received signal,a second envelope detector for generating a second processed signal from the second received signal, andan adder to generate the combined signal from the first processed signal and the second processed signal.

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