Transcription of Solving Convergence Problems - Intusoft
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Solving Convergence Problems - Intusoft
355 APPENDICESS olving SPICE Convergence ProblemsKey SourcesThe following techniques on Solving Convergence Problems aretaken from various sources including:[1]Meares, , Hymowitz SIMULATING WITHSPICE , Intusoft , 1988[2]Muller, A SPICE COOKBOOK , Intusoft , 1990[3]Meares, , Hymowitz SPICE APPLICATIONSHANDBOOK , Intusoft , 1990[4] Intusoft Newsletters, various dates from 1986 topresent[5]The Designer's Guide to SPIC and Spectre, KennethS. Kundert, Kluwer Academic Publishers, 1995[6]The SPICE Book, Andrei Vladimirescu, John Wiley &Sons Inc,, 1994[7]Inside SPICE, Ron Kielkowski, McGraw-Hill, is Convergence ? (or in my case, Non- Convergence )The answer to a nonlinear problem , such as those in the SPICEDC and Transient analyses, is found via an iterative example, ISSPICE makes an initial guess at the circuit s nodevoltages and then, using the circuit conductances, calculatesthe mesh currents. The currents are then used to recalculatethe node voltages, and the cycle begins again.
357 APPENDICES The following techniques can be used to solve 90 to 95% of all convergence problems. When a convergence problem is encountered, you should start at solution 0 and proceed with
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