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https://designers-guide.org/forum/YaBB.pl Modeling >> Semiconductor Devices >> physical parameter in bsim3v3 https://designers-guide.org/forum/YaBB.pl?num=1140230903 Message started by pbs681 on Feb 17th, 2006, 6:48pm |
Title: physical parameter in bsim3v3 Post by pbs681 on Feb 17th, 2006, 6:48pm Can somebody help me to list all the phycical parameter in bsim3v3? thx |
Title: Re: physical parameter in bsim3v3 Post by Paul on Feb 20th, 2006, 12:19pm You can find the model documentation on the official web site: http://www-device.eecs.berkeley.edu/~bsim3/get.html Hope this helps Paul |
Title: Re: physical parameter in bsim3v3 Post by pbs681 on Feb 21st, 2006, 4:28am Paul wrote on Feb 20th, 2006, 12:19pm:
Thanks Paul for the website. But what I mean here is that, from more than hundred parameters in MOS model, which one is carrying physical meaning... ie tox, cj.... we know that these parameters (MOS model) are mixing of empirical and physical parameters |
Title: Re: physical parameter in bsim3v3 Post by bernd on Feb 21st, 2006, 5:12am Maybe spectre -help bsim3v3 helps, if you are a Spectre user. Bernd |
Title: Re: physical parameter in bsim3v3 Post by Geoffrey_Coram on Feb 21st, 2006, 6:26am pbs681 wrote on Feb 21st, 2006, 4:28am:
pbs681 - I don't think your question is well posed. For example is CJ really physical? One could argue that it is a fitting parameter for the capacitance per area of the source/drain diffusion; the junction itself is probably not abrupt nor linearly graded. I think there's a continuum of sorts from the "truly physical" parameters like TOX to the "strictly empirical" parameters like VOFFCV. And many parameters probably have default values that are computed from physical values, but you can tweak them to fit the measurements better. (Eg, CGBO has a default value of 2*DWC*COX, which is physical, but what if you change it to 1.8*DWC*COX?) Probably your best bet would be to find an extraction guide for BSIM3, which would tell you what parameters you could fill in "good values" for from physical process information. -Geoffrey |
Title: Re: physical parameter in bsim3v3 Post by pbs681 on Feb 22nd, 2006, 3:45am Geoffrey_Coram wrote on Feb 21st, 2006, 6:26am:
Hi Geoffrey, I totally agree with you. My question was not well posed since I am still new in this field. That is what I mean. Sorry for that. Anyway I have question regarding Cj. In order to extract the Cj, we draw special test structure that include the Cj requirement extraction, ie area intensive and prephery intensive test structure. That means, Cj is directly extracted from the structure and not from the calculation. That is why I am reffering this parameter as a physical parameter. Is it correct? Where can I find an extraction guide for BSIM3. Really appreciate if anybody can help on this. |
Title: Re: physical parameter in bsim3v3 Post by Geoffrey_Coram on Feb 24th, 2006, 6:21am This web page http://www.eecs.berkeley.edu/IPRO/Software/Catalog/Description/bsim3v2.0.html says that an extraction guide for BSIM3 is available for $1. You may find it for free if you spend enough time with Google. |
Title: Re: physical parameter in bsim3v3 Post by pbs681 on Feb 24th, 2006, 7:28am Geoffrey_Coram wrote on Feb 24th, 2006, 6:21am:
Thanks Geoffrey. I will try to get it. |
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