International Business Machines Corporation. Research Division

George D. Gristede

Albert E. Ruehli

Charles A. Zukowski

Abstract: "A new method for the analysis and understanding of the convergence properties of the waveform relaxation (WR) circuit simulation method is derived. The method describes the convergence properties of WR through a continuous-time, linear time-varying (LTV) system convergence equation. From the LTV convergence equation, new sufficient conditions for the convergence of WR are derived which are less restrictive than those of all known previous work. The new sufficient conditions are shown to be valid both for the case of an exact solution of the circuit differential equations and the real-life case of an approximate numerical solution of these equations. An example is given, illustrating the application of the LTV convergence equation and comparing the new sufficient conditions for convergence of the WR method against previous work."

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