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RFID READER ARCHITECTURE

  • US 20100099355A1
  • Filed: 12/31/2009
  • Published: 04/22/2010
  • Est. Priority Date: 03/02/2006
  • Status: Active Grant
First Claim
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1. A block cancellation module within a radio frequency identification system (RFID) reader, comprising:

  • a controller coupled to receive an outbound RF signal generated by the RFID reader and operable to produce a cancellation signal from the outbound RF signal;

    a carrier injection module coupled to receive the cancellation signal and an inbound RF signal received by the RFID reader, the inbound RF signal including a blocking signal corresponding to the outbound RF signal and a modulated RF signal produced by an RFID tag responsive to the outbound RF signal, the carrier injection module operable to substantially cancel the blocking signal and substantially pass the modulated RF signal using the cancellation signal; and

    a feedback loop coupled to control the cancellation signal based on the modulated RF signal.

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