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Programmable trimmer for transponder

  • US 6,922,134 B1
  • Filed: 12/15/1999
  • Issued: 07/26/2005
  • Est. Priority Date: 04/14/1998
  • Status: Expired due to Fees
First Claim
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1. An RF transponder comprising an EEPROM memory, characterized by:

  • a trimming bits portion of the EEPROM memory comprising at least one trimming bit; and

    at least one trimming bit circuit associated with the at least one trimming bit, wherein each one of the at least one trimming bit circuits comprises;

    a trimming EEPROM cell comprising a pair of EEPROM transistors, wherein the pair of EEPROM transistors comprises a first EEPROM transistor and a second EEPROM transistor which cooperate to represent a single bit of trimming information;

    a trim sensing circuit;

    a reference voltage line connected to the pair of EEPROM transistors;

    at least one sensing line connecting the trimming EEPROM cell to the trim sensing circuit; and

    a trimming line for outputting the single bit of trimming information from the trim sensing circuit.

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