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Interference rejection in RFID tags

  • US 8,391,785 B2
  • Filed: 03/30/2010
  • Issued: 03/05/2013
  • Est. Priority Date: 04/29/2005
  • Status: Active Grant
First Claim
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1. A Radio Frequency Identification (RFID) tag circuit including:

  • a demodulator adapted to receive a modulated wireless RF input signal from an RFID reader and to derive a first digital output signal responsive to the modulated wireless RF input signal, wherein the first digital output signal comprises a sequence of digital pulses; and

    an interference rejection circuit adapted to receive the first digital output signal and to derive a second digital output signal responsive to the first digital output by substantially removing digital pulses shorter than a time duration threshold while substantially retaining digital pulses longer than the time duration threshold,wherein the time duration threshold is determined from one of a frame-sync tari symbol encoded in the modulated wireless RF input signal, a data rate associated with the modulated wireless RF input signal, and a statistic of a characteristic of a received data packet.

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