From: Stefan J. <st...@gr...> - 2006-02-17 06:53:59
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On Do, 16.02.2006, 17:14, Stefan Böttner wrote: > Hello, Hi! > I didn't expect that the default value of Vaf is inappropriate. It's not inappropriate, but makes the device a bit more non-ideal and thus helps the simulator to converge... Anyway I'll have a closer look on the weekend. Probably there is a convergence/numerical problem in general. Cheers, Stefan. >>> Here it is. >>>> >>>>> when trying to do a transient simulation I keep getting the error: >>>>> >>>>> ERROR: TR1: Jacobian singular at t = <some small number here>, >>>>> aborting transient analysis >>>>> >>>>> Before the error message I keep getting a lot of warnings such as: >>>>> >>>>> WARNING: TR1: inserted virtual resistance at node `_net3' connected >>>>> to [T4,V1] >>>>> >>>>> What may be causing this? >>>> >>>> That is about a singular MNA matrix (a circuit with no or multiple >>>> solutions) causing these error messages. Can you send me the >>>> schematic >>>> so I can have a look and tell you about... >> >> You can either e.g. set Vaf of T6/T7 to an appropriate value (i >> tried 10V >> for both) or put an initial node voltage to the foo node (double >> click foo >> label and enter 12 in the More... field). >> >> Hope this helps, Stefan. >> > > |