On 10:10 AM 16/04/2002 +0200, Rolf Molitor said:
>www.intusoft.com has some helpful technical articles about SPICE.
>(You have to register to download them)
>I wish Protel would offer more help for simulation ...
>One article describes in general convergence problems with some circuits and
>their causes (something like 'converg.pdf').
>The 'timestep to small' can have several reasons (GMIN, ABSTOL, RELTOL ...)
>but you can try to work with a fixed timestep instead of letting SPICE
>calculate its own (and have to go too small). The relevant article advises a
>'TRTOL=100' (large steps) and a maximum timestep for the transient analysis
>to 1/10 to 1/100 of the cycle time (limited steps), what nails the timestep
>to the declared maximum. It helped me out in some situations, particularly
>in some circuits with positiv feedback (like comparators).
>
>Rolf Molitor
>Ing.Buero i2e
>Remscheid / Germany

The Protel Sim Help file does offer quite a deal of info on dealing with 
convergence and other simulations issues.  There is a trouble shooting section.

Ian Wilson

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