[SI-LIST] Re: One strange question on my Hspice simulation!
- From: "Stephen Zinck" <signalintegrity@xxxxxxxxxxx>
- To: <wangyongjin@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 3 Aug 2005 09:24:11 -0400
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
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
> List technical documents are available at:
> http://www.si-list.org
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
