Re: [Help-gnucap] Time step control

[al davis]

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 
control.

In this case, tightening tolerance will get you by.