Boots – shoes – and leggings
Patent
1995-05-03
1997-08-12
Gordon, Paul P.
Boots, shoes, and leggings
395500, 25049222, 36446828, G03F 100, H01L 21027, H01J 37304
Patent
active
056572352
ABSTRACT:
Energy levels (dose) are manipulated to modify the resultant photomask representation in a controlled manner such that the final image in the semiconductor device fabrication is close to an ideal image. Feature sizes and shapes are modified by assigning relative mask writer doses rather than physically manipulating feature sizes in layout designs. This approach, based on coding of relative dose information onto the design data, allows continuous scale line width variation for all features without impact to data volume. Two embodiments are described. In the first embodiment, distortion knowledge in the form of a lookup table or convolution function is applied to CAD data which is fractured into numerous designs having specific dose assignments. In the alternative embodiment, distortion knowledge in the form of a lookup table or convolution function is applied to CAD data which generates an attribute file containing hierarchical dose information that is mapped onto the mask data. Both embodiments compensate specific mask feature sizes through dose offsets during the mask exposure process.
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Liebmann Lars Wolfgang
Martino Ronald Michael
Weed J. Tracy
Gordon Paul P.
International Business Machines - Corporation
Marc McDieunel
Peterson Jr. Charles W.
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