05657235 is referenced by 38 patents and cites 7 patents.

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.

Title
Continuous scale optical proximity correction by mask maker dose modulation
Application Number
8/434089
Publication Number
5657235
Application Date
May 3, 1995
Publication Date
August 12, 1997
Inventor
J Tracy Weed
Dutchess County
NY, US
Ronald Michael Martino
Fairfield
CT, US
Lars Wolfgang Liebmann
Dutchess County
NY, US
Agent
Witham Curtis Whitham & McGinn
Agent
Charles W Peterson Jr
Assignee
International Business Machines Corporation
NY, US
IPC
H01J 37/304
H01L 21/027
G03F 1/00
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