APPLICATION OF ASYMPTOTIC WAVE-FORM EVALUATION FOR ANALYSIS OF SKIN-EFFECT IN LOSSY INTERCONNECTS

Asymptotic waveform evaluation (AWE) is a recently developed technique for time-domain analysis of electrical interconnects, AWE is a comput ationally efficient method that asymptotically. approximates the respo nse of a large system with a lower-order transfer function. In this pa per, asymptotic waveform evaluation is used to analyze lossy interconn ects including the skin effect. The internal impedance of the intercon nect conductors varies as a function of the square root of the frequen cy. First, an overview of AWE is presented, The AWE formulation for mo deling frequency dependent loss in the conductors is derived using two different series expansions of the system response at both s=0 and s not equal 0 in the Laplace domain. The expansions for s not equal 0 ar e determined using a transfer function formulated for inclusion of the frequency-dependent internal impedance. The network response is compu ted by extracting the dominant pales and residues using the Pade appro ximation. The proposed method is evaluated using time-domain examples of lossy multiconductor transmission lines.