Interference rejection in RFID tags

  • US 8,600,298 B1
  • Filed: 11/01/2012
  • Issued: 12/03/2013
  • Est. Priority Date: 04/29/2005
  • Status: Active Grant
First Claim
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1. A Radio Frequency Identification (RFID) tag circuit comprising:

  • a demodulator configured to;

    receive a modulated wireless RF input signal from an RFID reader, and 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 configured to;

    receive the first digital output signal,determine a first time duration threshold,derive a second digital output signal responsive to the first digital output signal by substantially removing digital pulses shorter than the first time duration threshold while substantially retaining digital pulses longer than the first time duration threshold, andadjust the first time duration threshold based on at least one aspect associated with the wireless RF input signal selected from a preamble, a received packet, a filtered output signal, a data rate, and an expected next packet.

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