Re: initial_step and final_step in DC sweep

Marq -

Ack!  Those Silvaco models ... they were a true mess when I 
first saw them (they had capacitance models implememented
with a $sit_get_prev(), where sit = silvaco internal task,
so they weren't charge-conserving).  I didn't actually code
the model myself; I gave Silvaco some feedback and they put
my name in the header as though I was the author.

If you look at my MOS11 model, also on the Designer's Guide
site, you'll see that I do not use initial_step.

I'll admit, I was forced to use initial_step for one RF
simulator, where we were only interested in transient
performance, and it was not smart enough at the time to
build the dependency tree.

-Geoffrey


Marq Kole wrote:
> 
> Geoffrey,
> 
> :-))  <---- really big grin
> 
> In my most recent case it is a BSIM4 model that you coded, available from Silvaco, linked through by the Designer's Guide. Admittedly, it is from March 2004 (says the header - it's version 4.3.0 so it can't be older than 2003 when that model was released in C code). I've been updating it to version 4.4.0.
> 
> Rest assured that you're far from the only one; among the many others I've always been doing it myself. I'll to change my ways ... :-)
> 
> I'm more concerned about implementers having this implemented without considering the nitty-gritty detail of the standard.
> 
> Marq