Patent ID: 7900170

Claim:
An optical proximity correction (OPC) system, comprising: an integrated circuit (IC) layout generation unit configured to generate an IC layout including a plurality of fragments; a database unit storing a set of OPC models, each of the OPC models being configured to correct optical proximity effects on a target pattern depending on target specific characteristics including at least a type of the target pattern and a disposition type of peripheral pattern relative to the target pattern; and a mask layout generation unit including a model selector, the mask layout generation unit being configured to generate a mask layout including a plurality of mask layout patterns, wherein the model selector is configured to select at least one suitable OPC model from among the set of OPC models for each of the plurality of fragments by comparing a selected fragment with target patterns of the OPC models in target specific characteristics, and wherein comparing the selected fragment includes analyzing each of the plurality of fragments by evaluating a plurality of areas around each fragment, evaluating the plurality of areas including determining, for each area, whether the area is associated with a region of a pattern to which the fragment belongs, a region having no pattern, or a region on an interface of the pattern to which the fragment belongs.