Tolerable CD Variation Analyzer Using Perturbed Nominal Models Demonstrated on altPSM

In this paper, Mentor Graphics explores a methodology that adopts multiple simulations to model the variability in the lithography process. This approach is predicting the process behavior by the modulation of the related lithography parameters, such as: dose, focus, and overlay. The goal is to identify the unacceptable deviation of the printed image from the designed target due to process variations. The method also provides a better statistical evaluation of the quality and robustness of the implemented Resolution Enhancement Techniques (RET) & Design for Manufacturability (DfM) solution.