Laser trimming of resistors

Improved systems and methods for laser trimming resistors printed on a substrate layer are provided. An exemplary embodiment measures a resistance value for each annular resistor and sorts the annular resistors into one or more bins based on the measured resistance values and target resistance value...

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Bibliographic Details
Main Authors BIUNNO NICHOLAS, PATEL ATUL, DUDNIKOV GEORGE, OGLE KEN
Format Patent
LanguageEnglish
Published 12.02.2008
Subjects
BASIC ELECTRIC ELEMENTS
CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
MACHINE TOOLS
MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
PRINTED CIRCUITS
RESISTORS
SOLDERING OR UNSOLDERING
TRANSPORTING
WELDING
WORKING BY LASER BEAM
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Summary:Improved systems and methods for laser trimming resistors printed on a substrate layer are provided. An exemplary embodiment measures a resistance value for each annular resistor and sorts the annular resistors into one or more bins based on the measured resistance values and target resistance values associated with each resistor. A laser trim file may then be assigned to each bin based on a predictive trim formulation, where each laser trim file defines a set of configuration parameters for a laser drill to conform each resistor with their respective target value. The laser drill uses the laser trim files to trim the resistors within each bin in accordance with the laser trim file assigned to that bin.
Bibliography:Application Number: US20050094003