Methods of using adaptive sampling techniques based upon categorization of process variations, and system for performing same
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United States of America Patent
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Feb 22, 2005
Grant Date -
N/A
app pub date -
May 1, 2003
filing date -
May 1, 2003
priority date (Note) -
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Abstract
Methods of using adaptive sampling techniques based upon categorization of process variations, and a system for performing same are disclosed. In one illustrative embodiment, the method comprises acquiring metrology data regarding at least one process operation performed on a plurality of substrates in accordance with an initial metrology sampling plan, providing the acquired metrology dam to a controller that identifies process variations in the at least one process operation based upon the acquired metrology data and further identifies a plurality of categories of the process variations. The method further comprises creating, using the controller, a modified metrology sampling plan based upon a relative weighing of the identified categories of the process variations, wherein the modified metrology sampling plan differs from the initial metrology sampling plan in at least one aspect, and acquiring metrology data from at least one subsequently processed wafer in accordance with the modified neology sampling plan.
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