An efficient method for frequency-domain and transient analysis of interconnect networks

An improved method is proposed for efficiently computing the frequency and transient responses of large linear interconnect networks which can include lossy coupled transmission lines. Unlike previously published algorithms, where moment information from one expansion point is utilized independently of that from other points, the proposed method employs all the moment sets available from all updated expansion points in order to create more accurate multipoint Pade approximations. Using these multipoint approximations, the method requires, for the same accuracy, a smaller number of expansion points compared to existing multipoint moment matching techniques, resulting in a substantially reduced CPU time. The method generates a single transfer function for a large linear network and thus is convenient for both frequency-domain and time-domain analysis.