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Laser trimming of annular passive components

  • US 6,972,391 B2
  • Filed: 11/21/2002
  • Issued: 12/06/2005
  • Est. Priority Date: 11/21/2002
  • Status: Expired due to Term
First Claim
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1. A method for laser trimming annular resistors printed on a circuit board, the method comprising:

  • measuring a resistance value for each annular resistor;

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

    assigning a laser trim file to each bin based on a predictive trim formulation, each laser trim file defining a set of configuration parameters for a laser drill to conform each annular resistor with their respective target value; and

    using the laser drill to trim the annular resistors within each bin in accordance with the laser trim file assigned to that bin.

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