This is a symptom of SPICE being unable to
determine an operating point due to an
inflection or discontinuity in the equations.
You'll often see this if there's a node with
no DC path (e.g. two capacitors in series).
The solution to this is to put a LARGE resistor
in parallel with one of the caps (e.g. 10^12 ohms),
which allows the operating point to be determined
but doesn't exert any practical effect on the
circuit.
It's not a bug in Protel, but a symptom of the
way SPICE analyses circuits.
Occasionally, setting the stepping interval very
small may assist, however SPICE will self-shrink
its stepping intervals whenever it approaches
a high-slope variable, so this only assists under
specific circuit conditions.
Cheers,
John Haddy
> -----Original Message-----
> From: TSListServer [mailto:[EMAIL PROTECTED]]On
> Behalf Of iris mejma
> Sent: Wednesday, 14 February 2001 7:40 AM
> To: Multiple recipients of list proteledausers
> Subject: [PROTEL EDA USERS]: What's Gmin?
>
>
> Hi!
>
> I'm doing a simulation but the Protel says it found an error and
> in the file
> *.err it says:
>
> Note: starting Gmin stepping
> Note: One successful Gmin step
> Note: One successful Gmin step
> Note: One successful Gmin step
> Note: One successful Gmin step
> Note: One successful Gmin step
> Note: Gmin stepping completed
>
> This message appears two times but I don't know the meaning.
> If it says succesful, why is a error?
> Does somebody know the meaning of "Gmin"?
>
> I hope yes, thanks to everybody!!!
>
> Regards
>
> Iris Mejia
>
>
> ____________________________________________________________________
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