Reader for a radio frequency identification system having automatic tuning capability

  • US 6,650,227 B1
  • Filed: 12/08/1999
  • Issued: 11/18/2003
  • Est. Priority Date: 12/08/1999
  • Status: Expired due to Fees
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First Claim
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1. A reader for a radio frequency identification system comprising:

  • a resonant circuit including an LC pair for outputting an excitation signal;

    a current detector coupled to said resonant circuit for determining a value of an operational parameter of said resonant circuit;

    a decision-making circuit coupled to said current detector for formulating a decision in response to the value of the operational parameter; and

    an adjustment circuit coupled to said decision-making circuit and to said resonant circuit for receiving the decision and conveying an adjustment instruction to said resonant circuit in response to the decision, thereby modifying the excitation signal output by said resonant circuit in response to the adjustment instruction.

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