Title :
Finite-pole macromodels of transmission lines for circuit simulation
Author :
Kim, Seok-Yoon ; Gopal, Nanda ; Pillage, Lawrence T.
Author_Institution :
Comput. Eng. Res. Center, Texas Univ., Austin, TX, USA
Abstract :
A simple method for macromodeling transmission lines for circuit simulation is presented. Finite-pole y-parameter approximations in the frequency domain are derived for these infinite-order interconnects using either the AWE (asymptotic waveform evaluation) technique or closed-form expression for an iterative ladder circuit model. Macromodels are then applied to transform these rational functions in the s-domain to time-domain stencils which can be easily incorporated into SPICE. One difficulty with all finite-pole models of transmission lines has been the accurate handling of the time-of-flight delay. In the present work, the pure delay is shown to be handled directly by the iterative ladder y-parameters. For the case of `lumped´ transmission line circuits, a pseudo-time-of-flight delay is developed and calculated for incorporation in the time-domain macromodel
Keywords :
transmission line theory; SPICE; asymptotic waveform evaluation; circuit simulation; closed-form expression; equivalent circuit models; finite-pole macromodels; frequency domain; infinite-order interconnects; iterative ladder circuit model; lumped circuits; pseudo-time-of-flight delay; rational functions; s-domain; time-domain macromodel; time-domain stencils; time-of-flight delay; transmission lines; y-parameter approximations; Circuit simulation; Delay; Distributed parameter circuits; Driver circuits; Frequency domain analysis; Integrated circuit interconnections; Partial differential equations; RLC circuits; SPICE; Time domain analysis;
Conference_Titel :
Custom Integrated Circuits Conference, 1993., Proceedings of the IEEE 1993
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0826-3
DOI :
10.1109/CICC.1993.590745
