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Methods and apparatus for reducing power consumption of an active transponder

  • US 7,375,637 B2
  • Filed: 04/21/2006
  • Issued: 05/20/2008
  • Est. Priority Date: 04/21/2005
  • Status: Active Grant
First Claim
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1. A transponder apparatus having an identifier associated therewith, comprising:

  • a receiver for receiving an RF signal transmitted by an interrogator;

    a power source;

    a processing unit operatively coupled to said power source, said processing unit being capable of being in an inactive, sleep state and an active state;

    a buffer device in electronic communication with said receiver and with said processing unit, said buffer device being structured to;

    (i) receive an information signal based on said RF signal from said receiver, (ii) determine whether said information signal includes said identifier, and (iii) cause said processing unit to move from said inactive state to said active state and transmit at least a portion of said information signal to said processing unit only if it is determined that said information signal includes said identifier.

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