Re: [Ngspice-users] Bsim3: Diferent results in Ngspice and Hspice

[Victor B. <bou...@ma...>]

Hi All,

the difference in transient simulation can be due differences in the 
BSIM3 model. The HSPICE people did their own modifications to BSIM3 
implemented in HSPICE, so you may check HSPICE manual, may be they list 
the changes. However, latest BSIM3 versions should be all similar in 
their solutions.
Another possible reason is the accuracy options, as you pointed. First 
of all, check the option which controls the integration method in 
transient simulations (.OPTIO*NS METHOD=xxxxx), then the usual accuracy 
options (time step, RELTOL, ABSTOL).

Regards,
Victor

* Rui Tavares wrote:

>I'm comparing the results of a transient simulation between Ngspice and
>Hspice. They are different! For instance: a 20nSec difference in settling
>time with the same netlist ... Hspice gives the worst result. My guess is:
>(1) that I'm not using the same MOS device model in both simulators, or (2)
>not "feeding"/entering correctly the technology parameters from foundry ....
>
>So, ...The question is: What is the Device Model, in ngspice, that should be
>most equivalent to BSIM3v3.2.4 used in Hspice? Bsim3 ?!
>
>Is there any trick that I should use in Ngspice? Any option for accuracy,
>has there is in Hspice?
>
>Thanks in advance,
>Rui Tavares
>
>..:-----Original Message-----
>..:From: ngs...@li... [mailto:ngspice-
>..:dev...@li...] On Behalf Of Paolo Nenzi
>..:Sent: terça-feira, 17 de Abril de 2007 16:59
>..:To: ngs...@li...
>..:Subject: [Ngspice-devel] bsim4.6.0
>..:
>..:Hi all,
>..:
>..:I have ported bsim4.6.0 into ngspice. Attached you will find the
>..:initial implementation and some test results against the Berkeley's
>..:benchmark.
>..:
>..:If someone wants to test before committing...
>..:
>..:Ciao,
>..:Paolo
>
>  
>
>------------------------------------------------------------------------
>
>-------------------------------------------------------------------------
>This SF.net email is sponsored by DB2 Express
>Download DB2 Express C - the FREE version of DB2 express and take
>control of your XML. No limits. Just data. Click to get it now.
>http://sourceforge.net/powerbar/db2/
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Ngspice-users mailing list
>Ngs...@li...
>https://lists.sourceforge.net/lists/listinfo/ngspice-users
>  
>