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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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