Re: [Help-gnucap] Re: Scientific/engineering notation

[a r]

The error can be solved by decreasing the minimum timestep (default:
1e-12) by setting dtmin option:

.option dtmin=1e-13

Still, simulation using backward Euler method gives better results and
runs faster due to the lack of ringing. Is there any method to
"stabilize" the simulation using trapezoid method?

-r.

On Nov 30, 2007 2:03 AM, Leandro Marsó <address@hidden> wrote:
> 2007/11/29, a r <address@hidden>:
> > When using a TSMC 0.25 MOSIS models (level=49) setting the time step
> > below 0.1ns like below:
> >
> > .tran 0.01n 40n
> >
> > causes following problems.
> >
> > storage element step control error:Cgs.Mn1.xgate 1e-12
> > using Euler, disabling time step control
> >
> > With timestep of 0.1ns the simulation runs fine but the numerical
> > ringing is very visible.
> >
> > Any idea?
> >
> > -r.
>
> Hello -r,
> be carefull with the units in the length and width of the channel, it
> is in meter units. If it is not the problem, you could try to isolate
> the problem with a small circuit and paste it and send it to the list.
> good luck!
> Leandro
>
>
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