Patent ID: 8862417

Claim:
A method comprising: measuring a density of at least one chip; computing a difference in density between the density of the at least one chip and a density of at least one kerf structure; quantifying a process or performance offset for the at least one chip based on the computed difference in the density; quantifying a kerf ring oscillator offset based on the process or performance offset; calculating a kerf ring oscillator delay target to be used for the at least one chip based on the kerf ring oscillator offset; adjusting a delay of the at least one kerf structure to match the kerf ring oscillator delay target such that the at least one kerf structure is adjusted to match the process or performance offset quantified for the at least one chip; and adjusting parameters of the at least one kerf structure predefined by Wafer Acceptance Criteria (WAC) to match the density difference between the at least one chip and the at least one kerf structure such that performance of the at least one kerf structure with the adjusted delay tracks with performance of the at least one chip wherein at least the step of calculating the kerf ring oscillator delay target is performed using a processor.