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Multi-protocol radio frequency identification transponder tranceiver

  • US 20060238301A1
  • Filed: 06/16/2005
  • Published: 10/26/2006
  • Est. Priority Date: 02/22/2005
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a receiver to receive a radio frequency identification (RFID) signal, remove a carrier, extract an envelope of the RFID signal, compare the envelope to a previous envelope sample and generate an output for a digital decoder, the receiver also including an automatic gain control circuit to control gain of the receiver and tuning of an antenna circuit; and

    a transmitter to modulate a RFID reply signal that is to be transmitted in response to receiving the RFID signal at the receiver.

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