Re: BSIM3 and technology related question

solidrepellent@[EMAIL PROTECTED]
 wrote:

> Hi all,
> 
> I would be working on designing circuits at sub-threshold logic level.
> Before I start designing and simulating small little circuits I have
> to know a couple of things.
> 
> I understand that BSIM3 models are modelled quite well in sub-
> threshold region. But I am not sure if there are other models which
> are good compared to that. The questions that I have are related to
> this basically.
> 
> 1) Are there models which I could possibly use which are better than
> BSIM3? If yes, what are they?

BSIM4 for example.

> 2) How do I know that the models that I am using currently belong to
> BSIM3 or something else? How do I change those models in Cadence?

You can read the model source code. It is provided by the foundry. Check
your design kit.
 
> 3) How do I get parameters like gamma, k, mu, Vth etc for a particular
> technology. Every one says that it is in the technology file. But my
> question is where is that technology file?

You need to get it from the fab. 

You know that bsim3 has 81 and bsim4 251 independent parameters for
modelling ?

Check out the homepage from the bsim group (berkeley)
http://www-device.eecs.berkeley.edu/~bsim3

Regards,

 Stefan