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Multiplexer for a piezo ceramic identification device

  • US 7,514,842 B2
  • Filed: 06/27/2006
  • Issued: 04/07/2009
  • Est. Priority Date: 03/23/2000
  • Status: Expired due to Term
First Claim
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1. A multiplexer, comprising:

  • a plurality of first conductors coupled to first ends of piezo ceramic elements in corresponding rows;

    a plurality of first switches each of which is coupled to a respective one of the first conductors;

    a plurality of second conductors coupled to second ends of piezo ceramic elements in corresponding columns; and

    a plurality of second switches each of which is coupled to a respective one of the second conductors,wherein the first conductors are approximately orthogonal to the second conductors, andwherein the first switches are controlled to couple a signal output from an output port of the signal generator to a particular piezo ceramic element of the piezo ceramic elements, andwherein the second switches are controlled to couple a signal associated with the particular piezo ceramic element to an input port of the processor.

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