Patent ID: 8972031
Filing Date: 2015-03-03
Classification: G03F

Abstract:
1. A method, comprising: obtaining, using a first controller, a first process variable based on a measurement sample definition; determining, using the first controller, a first residual error over a wafer based on the first process variable and a first set point, wherein at least the first process variable and the first set point are input parameters of the first controller; controlling, using the first controller, a system based on the first residual error; obtaining, using a second controller, a second process variable based on the measurement sample definition; adjusting, using the second controller, the second process variable based on the first residual error; determining, using the second controller, a second set point based on the adjusted second process variable; feeding back, using the second controller, the second set point to the first controller; and determining, using the first controller, a second residual error, the second residual error being determined by the first controller based on the second set point.