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

From: al davis
Subject: Re: [Help-gnucap] Re: Scientific/engineering notation
Date: Thu, 29 Nov 2007 22:14:00 -0500
User-agent: KMail/1.9.7

On Thursday 29 November 2007, a r wrote:
> causes following problems.
> storage element step control error:Cgs.Mn1.xgate 1e-12
> using Euler, disabling time step control

Don't worry about this unless you really care about the 
influence of the capacitor Cgs.Mn1.xgate.  It is doing what you 

When you see something like "Cgs.Mn1,xgate" .. this refers to 
the capacitor "Cgs" that is inside the model of "Mn1".

> With timestep of 0.1ns the simulation runs fine but the
> numerical ringing is very visible.
> Any idea?

It depends on what you want.  Maybe ".option method=euler" will 
make it work.  If this is a digital circuit, that's what to do.  
That is what the "fast spice" simulators do.

Spice does some re-interpolation of results, that often hides 
this kind of problem.  You still get incorrect results, but 
without any indication that there might be something wrong,

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