RFID tags calibrating backscattering period also for non-integer divide ratios

  • US 7,246,751 B2
  • Filed: 10/24/2005
  • Issued: 07/24/2007
  • Est. Priority Date: 10/26/2004
  • Status: Active Grant
First Claim
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1. A circuit for a radio frequency identification (RFID) tag, comprising:

  • a demodulator that is arranged to demodulate a waveform of a wirelessly received wave;

    a processing block that includes;

    a counter configured to determine an L-number from a duration of a calibration feature of the waveform, anda combining circuit configured to combine a first nonzero version of the L-number with a second nonzero version of the L-number so as to derive a BP-number such that the derived BP-number substantially equals the L-number divided by a preset non-integer divide ratio; and

    a modulator that is arranged to modulate a second wave with encoded symbols that have a periodicity determined from the BP-number.

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