Patent ID: 9052709
Filing Date: 2015-06-09
Classification: G05B,Y02P

Abstract:
1. A method for providing process tool correctables to one or more process tools, comprising: performing a first measurement process on a wafer of a lot of wafers with a measurement system, wherein the first measurement process includes measuring one or more characteristics of a plurality of targets distributed across one or more fields of the wafer of the lot of wafers; determining, with one or more processors communicatively coupled to the measurement system, a set of process tool correctables for a residual larger than a selected threshold level utilizing a loss function, wherein the loss function is configured to fit a model for one or more process tools, as a function of field position, to one or more of the measured characteristics of the plurality of targets measured with the measurement system, wherein the set of process tool correctables includes one or more parameters of the model that act to minimize the difference between a norm of the residual and the selected threshold when the norm of the residual is equal to or greater than the selected threshold, wherein the loss function nullifies the residual when the norm of the residual is below the selected threshold; transmitting one or more control signals from the one or more processors to the one or more process tools, the one or more control signals being a function of the determined set of process tool correctables; and controlling the one or more process tools based on the one or more control signals in order to control one or more processes associated with the one or more process tools.