FreeLists / si-list / [SI-LIST] Re: One strange question on my Hspice simulation!

["Stephen Zinck" <signalintegrity@xxxxxxxxxxx>]

Hi Stephen,

I am curious if when you state that you "cut the path", did you actually 
removed the corresponding unused model from the spice deck (comment it out, 
etc.)? The reason I ask is you may be experiencing what I call "model 
cannibalism" whereby the two different models are using the same name for in 
internal model name or node. If there are any .scale or any .global calls 
you could also have trouble.

When I have suspected this sort of problem in the past, I "protect" the 
models by placing them in a subcircuit (by all rights you would only have to 
place one of the device models in a subcircuit to correct the problem)...

If you are lucky enough to have an unencrypted netlist for the devices, you 
could try to find the node issue and make a change. I have had good success 
with this in the past as well.

If you want, I could take a look at your deck and see if I can find the 
problem.

Best,
Steve

Stephen P. Zinck
Interconnect Engineering
25 Bennett Lot Road
South Berwick, ME 03908
Phone - (207) 384-8280
Email - szinck@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Web - www.interconnectengineering.com

----- Original Message ----- 
From: "Stephen Wang(Huawei)" <wangyongjin@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, August 03, 2005 7:46 AM
Subject: [SI-LIST] One strange question on my Hspice simulation!


> Hi all,
> I want to estimate one p2p net with Hspice, the structure is simple p2p 
> net like as following: IC_buffer_output <--> transmission line <--> 
> IC_buffer_input.
> After I finished the whole structure, one strange question appears when I 
> running the *.sp file. The error note given is as following: BSIM3 Fatal 
> **error** Effective channel width <= 0.
> I can't find what is wrong with the file, so I do some test through 
> cutting the path as following 4 steps: (1) cut the connection between 
> buffer_input and transimission line; (2)add one C_loading to the end of 
> transimission line and run the simulation, the result is ok; 
> (3)stimulating the buffer_input directly, it works also rightly. 
> (4)However, as described before, when I connected the whole 
> channel(buffer_output + transimission line + buffer_input), it doesn't 
> work.
> Appreciate your advice very much! Thanks firstly!
>
> Best Regards!
>
> Stephen
>
>
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