Extending moment computation to 2-port circuit representations

In this paper, we present an extension of moment computation to 2-port circuits. Our formulas are applicable to both transfer function moments and driving-point admittance moments. Given the input admittances, output admittances, and transfer functions of two 2-ports, our formulas compute the input admittance, output admittance, and transfer function when these 2-ports are combined either in parallel or in series. A nice conclusion of our work is the discovery our formulas form an elegant framework integrating the results from two classical papers. Rubinstein et al. and O´Brien and Savarino, for computing the Elmore delay and driving-point admittance moments in RC trees.