Patent ID: 8056028

Claim:
A method of tuning a first mask writer unit utilizing a reference mask writer unit, said first mask writer unit and said reference mask writer unit each having tunable parameters for controlling mask writing performance, said method comprising steps of: defining a test pattern and a mask writing model; generating said test pattern utilizing said reference mask writer unit and measuring mask writing results; generating said test pattern utilizing said first mask writer unit and measuring mask writing results; calibrating said mask writing model utilizing said mask writing results corresponding to said reference mask writer unit, said calibrated mask writing model having a first set of parameter values; tuning said calibrated mask writing model utilizing said mask writing results corresponding to said first mask writer unit, said tuned calibrated mask writing model having a second set of parameter values; and adjusting said tunable parameters of said first mask writer unit based on a difference between said first set of parameter values and said second set of parameter values.