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Two-level demodulation method and device

  • US 8,045,640 B2
  • Filed: 03/21/2006
  • Issued: 10/25/2011
  • Est. Priority Date: 03/21/2005
  • Status: Expired due to Fees
First Claim
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1. Method for demodulating information emitted by amplitude modulation with two levels by a reader to a transponder, the method comprising:

  • using a voltage regulation loop to generate a slaving voltage that is a function of a signal received by the transponder, the voltage regulation being a regulation on a voltage at terminals of a load impedance;

    determining a sign signal representing the variations of the slaving voltage, the sign signal taking a first or a second value depending on whether the slaving voltage is increasing or decreasing;

    checking, for each symbol, the hold time of the sign signal; and

    determining modulation level based on said checking.

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