Computation of X-Parameters Using Multipoint Moment Expansion

Recently X-parameters
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have been proposed as an extension to the concept of S-parameters in order to create a macromodel that captures nonlinear behavior. In this paper, we develop a relation between the X-parameters and circuit moments. Higher order multidimensional moments are then used to efficiently compute the X-parameters as a piecewise polynomial approximation with respect to input power. The proposed approach is shown to be accurate and CPU efficient compared to the brute force methods.