Computation of the X-parameters of multi-tone circuits using multipoint moment expansion

The efficient generation of X-parameter1 macro-models for nonlinear RF circuit blocks that capture the essential nonlinear behavior of the system has become increasingly useful and even necessary. Recent work on X-parameter computations have provided clear relations between the X-parameters and circuit moments. In this paper, we show how higher order multi-dimensional moments evaluated using multi-point expansions can be used to efficiently compute the X-parameters for two-tone inputs, which are commonly found in general RF circuits.