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.