phase correct routing for alternating phase shift masks
In this paper, we investigate routing restrictions that enable the generation of "correct by construction" layouts for Dark Field AltPSM. Existing routers produce designs in which coloring errors are numerous, and up to 15\% of the pin locations in macros may cause unavoidable coloring errors. We identify routing restrictions which produce 100\% phase-correct results, and quantify the impact on wire-lengths and via counts.
routing layout resolution enhancement techniques (ret) lithography