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HSPICE model parameter passing

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Subhajit
Guest

Tue Jul 26, 2005 11:53 am   



I would like to modify a model parameter of
a MOSFET while instantiating it
e.g. threshold voltage parameter
VTH0 of BSIM3V3 mosfet parameters:

M1 1 2 3 4 w=10u l=2u VTH0=0.5

However HSPICE does not allow
modification of model parameters
this way. Some other versions of
Spice do allow this. Is there a
way out?

The reason I wish to modify VTH0
is to run a Monte-Carlo sim for
threshold voltage mismatches.

Jim Thompson
Guest

Tue Jul 26, 2005 1:26 pm   



On 26 Jul 2005 05:53:10 -0700, "Subhajit" <sub_sen_at_hotmail.com> wrote:

Quote:
I would like to modify a model parameter of
a MOSFET while instantiating it
e.g. threshold voltage parameter
VTH0 of BSIM3V3 mosfet parameters:

M1 1 2 3 4 w=10u l=2u VTH0=0.5

However HSPICE does not allow
modification of model parameters
this way. Some other versions of
Spice do allow this. Is there a
way out?

The reason I wish to modify VTH0
is to run a Monte-Carlo sim for
threshold voltage mismatches.

Rewrite your model file so that, in the model "card, VTHO='VTChange'

Then declare PARAM VTChange in a .INCLUDE file.

PSpice would use VTHO={VTChange}

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
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| http://www.analog-innovations.com | 1962 |

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