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Re: [Help-gnucap] Minimal stepsize in trasient analysis

From: Al Davis
Subject: Re: [Help-gnucap] Minimal stepsize in trasient analysis
Date: Sun, 3 Oct 2004 22:56:59 -0400
User-agent: KMail/1.7

On Saturday 18 September 2004 01:09 pm, 
address@hidden wrote:
> In transient analysis, can the stepsize be smaller than
> 1e-12? I'm not succeeding doing so...
> For example:
> .gen Delay=0.5e-10 width=0.5e-10 period=1e-10 max=1 min=0
> rise=0 fall=0 .tran 0 1e-10 1e-12
> If I write 0.5e-12 instead of the last 1e-12 then I get the
> message "very backward time step".
> Can anyone explain me this? I nees more accurate transient
> analysis...

It is a bug, but there is an easy work-around:

".option dtmin=1e-99"

Actually, "it's not a bug it's a feature".  The bug is a stupid 
default value.

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