temp models in CircuitMaker

[Robert C Monsen]

I've obtained some newer models from fairchild for various mosfets, but they
seem not to run (without modification) in CircuitMaker, due to the inclusion
of expressions dependent on TEMP. I got them to run by simply evaluating the
TEMP constant as 25 and replacing the expression by the result. However, it
would be useful to be able to run the system at different temperatures.

Is there a way to make CircuitMaker evaluate expressions?

Here is an example from the model:

..MODEL DMOS PMOS (
+ VTO={-3.5*{-0.00034*TEMP+1.0085}}
+ KP={9.3*{-0.000014*TEMP+1.00035}}
+ THETA=0.056 VMAX=1.95E5 LEVEL=3)

Here is the output:

*.MODEL DMOS PMOS (VTO={-3.5*{-0.00034*TEMP+1.0085}}
KP={9.3*{-0.000014*TEMP+1.00035}} THETA=0.056 VMAX=1.95E5 LEVEL=3)
* Error in preceeding PARAM line: Unknown operator in:
{-3.5*{-0.00034*TEMP+1.0085}

TEMP definitely exists in the analog setup options.

Thanks,
Bob Monsen

 

[Jim Thompson]

On Fri, 27 Feb 2004 22:19:16 GMT, "Robert C Monsen"
<rcsurname@comcast.net> wrote:

I've obtained some newer models from fairchild for various mosfets, but they
seem not to run (without modification) in CircuitMaker, due to the inclusion
of expressions dependent on TEMP. I got them to run by simply evaluating the
TEMP constant as 25 and replacing the expression by the result. However, it
would be useful to be able to run the system at different temperatures.

Is there a way to make CircuitMaker evaluate expressions?

Here is an example from the model:

.MODEL DMOS PMOS (
+ VTO={-3.5*{-0.00034*TEMP+1.0085}}
+ KP={9.3*{-0.000014*TEMP+1.00035}}
+ THETA=0.056 VMAX=1.95E5 LEVEL=3)

Here is the output:

*.MODEL DMOS PMOS (VTO={-3.5*{-0.00034*TEMP+1.0085}}
KP={9.3*{-0.000014*TEMP+1.00035}} THETA=0.056 VMAX=1.95E5 LEVEL=3)
* Error in preceeding PARAM line: Unknown operator in:
{-3.5*{-0.00034*TEMP+1.0085}

TEMP definitely exists in the analog setup options.

Thanks,
Bob Monsen

How does CircuitMaker punctuate an expression? Many simulators use
'...' instead of {...} which is pretty-much PSpice-specific.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
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| E-mail Address at Website Fax480)460-2142 | Brass Rat |
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