Patent Document ID: 20120022836
Application ID: 12841932
Patent Flag: 0

Claim One:
1. A method for identifying a set of scatterometry model parameters that are to be floated during a scatterometry analysis to fit a model to measured spectral information, the method comprising: receiving the measured spectral information; receiving a scatterometry model having a plurality of model parameters (N); computing a Jacobian matrix of the measured spectral information, the Jacobian matrix containing a column for each of the plurality of model parameters; identifying, based on a precision metric determined from the Jacobian matrix for each model parameter in a plurality of parameter combinations, a set of model parameters for which each parameter of the set of model parameters is to be fixed to a predetermined parameter value in a revised scatterometry model; and running a regression on the measured spectral information with the revised scatterometry model to generate simulated spectral information.