Re: DC convergence

Linda,

This is a well known issue. Here is the workaround:

1) Make sure the [Iterate] keywork is in your .s2i file. If s2ibis2 generated
   the Input(.spi)and Output(.out)files successfully, the iterate feature helps
   not to re-sim these same model_types again.
   
2) Edit the .spi files that caused the convergence problem by reducing the
   range:
   
   Example:
   
   .DC VOUTS2I 0 -1.5 -0.1 #(GND clamp sweep edited to go from 0V to -1.5V)
   
3) Re-run s2ibis2

Hope this helps.
Syed
Cisco Systems, Inc
   
> X-Sender: angulo@mail.hyperlynx.com
> Date: Tue, 05 Sep 2000 16:42:20 -0700
> To: ibis-users@eda.org
> From: Linda Chu x3207 <lindac@eng.adaptec.com> (by way of John Angulo
<angulo@hyperlynx.com>)
> Subject: DC convergence
> Mime-Version: 1.0
>
> Hi,
> When DC sweep range from -Vcc to Vcc*2 on the PULLUP/PULLDOWN
> simulation, it has convergence problem. I try to use the alternative
> method is to do an AC, but the SPICE-IBIS convertor doesn't recognize
> the spice output format. So when it generated the IBIS model, it puts
> out N/A in the current table. Is there anyone can help me on this?
> thanks
> linda
>

 
Received on Tue Sep 5 17:43:02 2000