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RFID apparatus

  • US 8,373,544 B2
  • Filed: 10/29/2004
  • Issued: 02/12/2013
  • Est. Priority Date: 10/29/2003
  • Status: Active Grant
First Claim
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1. RFID apparatus with an antenna, the RFID apparatus having a reader mode of operation and a tag emulation mode of operation, comprising:

  • a transmitter operative to transmit a first RF signal via the antenna to an external tag device when the apparatus is in the reader mode;

    a receiver operative to receive a second RF signal from the external tag device via the antenna; and

    a tag emulation generator operative to generate a third RF signal dependent upon characteristics of an incoming fourth RF signal received from an external reader device, and transmit the generated third RF signal using the antenna to the external reader device when the apparatus is in the tag emulation mode, wherein the tag emulation generator includes a phase locked loop having an oscillator and a phase detector, wherein the phase detector is configured to continue to operate when the apparatus is in the reader mode.

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