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New multilevel and hierarchical algorithms for layout density control

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4 Author(s)
Kahng, A.B. ; Dept. of Comput. Sci., California Univ., Los Angeles, CA, USA ; Robins, G. ; Singh, A. ; Zelikovsky, A.

Certain manufacturing steps in very deep submicron VLSI involve chemical-mechanical polishing (CIMP) which has varying effects on device and interconnect features, depending on local layout characteristics. To reduce manufacturing variation due to CMP and to improve yield and performance predictability, the layout needs to be made uniform with respect to certain density criteria, by inserting “fill” geometries into the layout. This paper presents an efficient multilevel approach to density analysis that affords user-tunable accuracy. We also develop exact fill synthesis solutions based on combining multilevel analysis with a linear programming approach. Our methods apply to both flat and hierarchical designs

Published in:

Design Automation Conference, 1999. Proceedings of the ASP-DAC '99. Asia and South Pacific

Date of Conference:

18-21 Jan 1999

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