Agilent-Advanced Model Composer

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Advanced Model Composer and Model Composer rely on a unique, patented, EM-(Momentum) based modeling method, thus providing EM accuracy and generality attraditional circuit simulation speed. Models are generated in an up-front model generationstep and added to the model database associated with the layout component. Modelsgenerated by AMC can be recognized by their .pml extension.

AMC provides an option for populating the model database of a Layout component, upfront, prior to using the Layout component in a schematic. Typically, the model databaseof a Layout component is updated with Momentum simulation data on-the-fly, while usingthe Layout component in a schematic.AMC uses an adaptive rational/polynomial curve fitting algorithm, which is a multi-dimensional version of Momentum's Adaptive Frequency Sampling (AFS) algorithm.The .rat (=RATional) files generated by Momentum's AFS algorithm contain informationabout the rational fitting model of single Momentum simulations. There can be multiple.rat files in the model database for a single layout component.

The AMC algorithms combine multiple .rat files into one global .pml (Passive ModelLibrary) file. This file contains the multi-dimensional rational/polynomial model that isused to represent the S-data in the user-defined parameter/design space.