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Re: [Help-gnucap] Time step control

From: al davis
Subject: Re: [Help-gnucap] Time step control
Date: Sat, 1 Dec 2007 12:47:49 -0500
User-agent: KMail/1.9.7

On Saturday 01 December 2007, a r wrote:
> I think default settings for the time-step control are too
> aggressive.
> I am getting best results with the following settings:
> .option method=euler dtmin=1e-16 reltol=1e-4 itl3=3 itl4=4
> .tran 1n 20n trace alltime > inverter_test.dat
> If I do not specify low thresholds for itl3, itl4 gnucap has
> a tendency to use maximum allowed time steps (here 1n) and
> "jump over" all interesting transistions.

The real problem is that some devices don't trigger events 
properly.  I know what to do, just haven't done it yet.  
The "pulse" function is one of them.

"method=euler" disables the truncation error part of step 

In this case, tightening tolerance will get you by.  

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