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Laser trimming of resistors

  • US 7,329,831 B2
  • Filed: 03/29/2005
  • Issued: 02/12/2008
  • Est. Priority Date: 11/21/2002
  • Status: Expired due to Term
First Claim
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1. A system for laser trimming annular resistors printed on a circuit board, the system comprising:

  • a tester having means for measuring a resistance value for each annular resistor;

    a trim application having;

    means for sorting the annular resistors into one or more bins based on the measured resistance values and target resistance values associated with each annular resistor; and

    means for assigning a laser trim file to each bin based on a predictive trim formulation to conform each annular resistor with their respective target value; and

    a laser drill having means for trimming the annular resistors within each bin in accordance with the laser trim file assigned to that bin, each laser trim file defining a set of configuration parameters for the laser drill.

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