Patent ID: 7623995

Claim:
A method of simulating the operation of a fabricated integrated circuit consisting of one or more devices using a simulator which includes a compact simulation model comprising a set of parameters and equations to perform mathematical calculations to model a device, comprising the steps of: measuring the electrical characteristics on one or more devices in the fabricated circuit, selecting a subset G of the electrical characteristics to optimize, setting the values of the remaining set P of model parameters so as to minimize or nullify their effect on the characteristics yielded by the model, optimizing the set K of parameters in order that the model yields characteristics whose numerical value best approximates the subset G of the electrical characteristics for the devices, storing the optimized values of the set K of parameters as a data Q, further selecting a set M of model parameters from the set P pf model parameters, to optimize, further selecting a subset R of the electrical characteristics to optimize, optimizing the set M in order that the model yields characteristics whose numerical value best approximates the subset R, while simultaneously correcting values of the set K based on characteristics G and the values used in optimization of the set M and the data Q such that the new value of each parameter in K is computed from it's value in the data Q and such that the change in the values of the set K exactly counteracts the effect of the change in the values of the set M when the model is evaluated in the subset G of electrical characteristics, such that the fit of the model over G is exactly the same as when the data Q was stored.