Patent ID: 7966583

Claim:
A method for determining an effect of process variation, the method comprising: receiving a layout which includes multiple instances of a pattern, wherein the pattern is designed to be electrically testable when printed; receiving a set of photolithography process models which model the photolithography process under different exposure and focus conditions; performing optical proximity correction on a first instance and a second instance of the pattern in the layout to obtain a corrected layout, wherein the first instance and the second instance of the pattern in the layout are corrected using different photolithography process models in the set of photolithography process models; printing the corrected layout on a single wafer by subjecting the corrected layout to a single application of the photolithography process; performing electrical tests on features on the wafer, wherein the features are associated with the instances of the pattern; and storing results of the electrical tests, wherein the results of the electrical tests correspond to the photolithography process being operated under different exposure and focus conditions.