Method and apparatus for controlled persistent ID flag for RFID applications

  • US 7,215,251 B2
  • Filed: 07/08/2004
  • Issued: 05/08/2007
  • Est. Priority Date: 04/13/2004
  • Status: Active Grant
First Claim
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1. A Radio-Freguency Identification (RFID) transponder including:

  • an identification flag circuit to maintain an RFID transponder state, the identification flag circuit including a first capacitor and a digital element coupled to the first capacitor receive a voltage of the first capacitor;

    a discharge circuit to drain the first capacitor via a discharge current that is distinct from a semiconductor leakage current; and

    ,a charge circuit, wherein the semiconductor leakage current is through an open switch of the charge circuit.

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