Methods and systems for determining a position of inspection data in design data space
First Claim
1. A computer-implemented method for determining a position of inspection data in design data space, comprising:
- using a computer system to performing the following steps;
determining a centroid of an alignment target formed on a wafer using an image of the alignment target acquired by imaging the wafer, wherein determining the centroid of the alignment target comprises determining a cross correlation between an edge profile for a first edge of the alignment target and a mirrored edge profile for a second edge of the alignment target opposite to the first edge, determining a peak of the cross correlation, and determining a mid-point between the first and second edges using a position of the peak and sizes of the edge profiles;
aligning the centroid to a centroid of a geometrical shape describing the alignment target;
assigning a design data space position of the centroid of the alignment target as a position of the centroid of the geometrical shape in the design data space; and
determining a position of inspection data acquired for the wafer in the design data space based on the design data space position of the centroid of the alignment target.
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Abstract
Various methods and systems for determining a position of inspection data in design data space are provided. One computer-implemented method includes determining a centroid of an alignment target formed on a wafer using an image of the alignment target acquired by imaging the wafer. The method also includes aligning the centroid to a centroid of a geometrical shape describing the alignment target. In addition, the method includes assigning a design data space position of the centroid of the alignment target as a position of the centroid of the geometrical shape in the design data space. The method further includes determining a position of inspection data acquired for the wafer in the design data space based on the design data space position of the centroid of the alignment target.
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Citations
18 Claims
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1. A computer-implemented method for determining a position of inspection data in design data space, comprising:
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using a computer system to performing the following steps; determining a centroid of an alignment target formed on a wafer using an image of the alignment target acquired by imaging the wafer, wherein determining the centroid of the alignment target comprises determining a cross correlation between an edge profile for a first edge of the alignment target and a mirrored edge profile for a second edge of the alignment target opposite to the first edge, determining a peak of the cross correlation, and determining a mid-point between the first and second edges using a position of the peak and sizes of the edge profiles; aligning the centroid to a centroid of a geometrical shape describing the alignment target; assigning a design data space position of the centroid of the alignment target as a position of the centroid of the geometrical shape in the design data space; and determining a position of inspection data acquired for the wafer in the design data space based on the design data space position of the centroid of the alignment target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18)
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9. A non-transitory computer-readable medium, comprising program instructions executed by a processor for performing a method for determining a position of inspection data in design data space, wherein the method comprises:
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determining a centroid of an alignment target formed on a water using an image of the alignment target acquired by imaging the wafer, wherein determining the centroid of the alignment target comprises determining a cross correlation between an edge profile for a first edge of the alignment target and a mirrored edge profile for a second edge of the alignment target opposite to the first edge, determining a peak of the cross correlation, and determining a mid-point between the first and second edges using a position of the peak and sizes of the edge profiles; aligning the centroid to a centroid of a geometrical shape describing the alignment target; assigning a design data space position of the centroid of the alignment target as a position of the centroid of the geometrical shape in the design data space; and determining a position of inspection data acquired for the wafer in the design data space based on the design data space position of the centroid of the alignment target.
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10. A system configured to determine a position of inspection data in design data space, comprising:
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an inspection system configured to acquire an image of an alignment target formed on a wafer and inspection data for the wafer; and a processor coupled to the inspection system, wherein the processor is configured to; determine a centroid of the alignment target using the image of the alignment target by determining a cross correlation between an edge profile for a first edge of the alignment target and a mirrored edge profile for a second edge of the alignment target opposite to the first edge, determining a peak of the cross correlation, and determining a mid-point between the first and second edges using a position of the peak and sizes of the edge profiles; align the centroid to a centroid of a geometrical shape describing the alignment target; assign a design data space position of the centroid of the alignment target as a position of the centroid of the geometrical shape in the design data space; and determine a position of the inspection data in the design data space based on the design data space position of the centroid of the alignment target.
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Specification