For my opinion its not nearly sufficient for such a complex subject.
To my recollection the simulator was adopted from MicroCode, which is a full
member of the altium family. The guys there surely have very very very much
more knowhow concerning simulation that could (and should) be shared with
the protel users.
Hoping for better to come with next revision.

Rolf Molitor
Ing.Buero i2e
Remscheid / Germany


-----Ursprüngliche Nachricht-----
Von: "Ian Wilson" <[EMAIL PROTECTED]>
An: "Protel EDA Forum" <[EMAIL PROTECTED]>
Gesendet: Dienstag, 16. April 2002 12:29
Betreff: Re: [PEDA] Was: Simulation, timestep too small


> 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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