Method and apparatus for translating detected wafer defect coordinates to reticle coordinates using CAD data
First Claim
1. A method of locating repeater defects in a device under test, comprising:
- providing an inspection image of a device under test including detected coordinates of potential repeater defects;
converting the inspection image into a first image in a predetermined image format;
providing CAD data for the device under test;
converting the CAD data into a second image in the predetermined image format;
aligning the first and second images;
converting the detected coordinates of potential repeater defects into CAD coordinates; and
locating repeater defects as a function of the CAD coordinates.
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Accused Products
Abstract
Systems and methods are described for translating detected wafer defect coordinates to reticle coordinates using CAD data. A wafer inspection image is provided and coordinates of potential defects in the wafer are determined. Then the wafer inspection image is converted into a predetermined image format. CAD data for the device under test is then used to produce a second image, also in the predetermined image format. The CAD-derived image and the wafer-derived image are then aligned, and the coordinates of potential defects in the wafer are converted into CAD coordinates. The CAD coordinates are then used to navigate through the reticle for the wafer in order to locate reticle defects corresponding to the detected wafer defects.
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Citations
15 Claims
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1. A method of locating repeater defects in a device under test, comprising:
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providing an inspection image of a device under test including detected coordinates of potential repeater defects;
converting the inspection image into a first image in a predetermined image format;
providing CAD data for the device under test;
converting the CAD data into a second image in the predetermined image format;
aligning the first and second images;
converting the detected coordinates of potential repeater defects into CAD coordinates; and
locating repeater defects as a function of the CAD coordinates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for locating repeater defects in a semiconductor wafer reticle, comprising:
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generating a wafer image of a semiconductor wafer under test;
determining stage coordinates for detected potential repeater defects in the wafer under test;
generating a CAD image from CAD data related to the semiconductor wafer under test;
aligning the wafer image and the CAD image and determining CAD coordinates from the stage coordinates corresponding to said potential repeater defects; and
locating repeater defects in a semiconductor wafer reticle for the semiconductor wafer under test as a function of the CAD coordinates. - View Dependent Claims (10, 11, 12)
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13. A method of locating repeater defects in a device under test, comprising:
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mounting a device under test on a stage;
generating an image of the device under test;
determining stage coordinates for detected potential repeater defects in the device under test;
generating a CAD image from CAD data corresponding to the device under test;
converting the image of the device under test and the CAD image into a common image format;
aligning the image of the device under test and the CAD image in the common image format;
determining CAD coordinates of the potential repeater defects from the stage coordinates for the detected potential repeater defects; and
locating repeater defects as a function of the CAD coordinates. - View Dependent Claims (14, 15)
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Specification