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Re: [Help-gnucap] convergence failure?

From: al davis
Subject: Re: [Help-gnucap] convergence failure?
Date: Fri, 18 May 2012 09:18:24 -0400
User-agent: KMail/1.13.5 (Linux/2.6.32-5-amd64; KDE/4.4.5; x86_64; ; )

On Wednesday 16 May 2012, Chris Cole wrote:
> Hey all, I've spent the last day or so messing around with
> gschem and  gnucap trying to simulate a half wave rectifier
> circuit. I'm attaching what I have so far...the problem I'm
> seeing is with running a transient analysis. If my sine wave
> voltage goes over 10 Volts, I get the convergence
> error...under 10 Volts and I can run without a problem? I'm
> sure it's something stupid. Hopefully somebody has seen
> something of this nature before. All you should have to do
> to replicate the problem is run 'make' inside the extracted
> folder. I have the sine voltage set to 11 V, so the error
> should appear.

The list strips out attachments and holds HTML postings for 
moderation.  Can you send us the files as plain text?

I am aware of a convergence problem with the diode.  The 
"modelgen" models are planned for replacement.  

A couple of suggestions:

1. Simple .. try "option dampstrategy=2".  (Take a partial 
Newton step in certain situations.)  

2. (more like the long term solution) ..  Try using the spice 
diode model plugin instead.

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