Patent ID: 6208747
Filing Date: 2001-03-27
Classification: G03F

Abstract:
A method of characterizing a lithographic scanning system, comprising the steps of:printing a first pattern using a reticle having a first orientation with respect to the lithographic scanning system;measuring a critical dimension of the first pattern at a plurality of points;printing a second pattern using the reticle having a second orientation with respect to the lithographic scanning system different than the first orientation;measuring a critical dimension of the second pattern at the plurality of points;measuring a critical dimension on the reticle at a plurality of points corresponding to the plurality of points of the first and second patterns;determining a reticle critical dimension component and a non-reticle critical dimension component of the patterns at the plurality of points; anddetermining a scanning system critical dimension component of the patterns using the non-reticle critical dimension component data along a plurality of points corresponding to a scanning direction of the lithographic scanning system.