HSPICE model parameter passing

[Subhajit]

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]

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