RE: [SI-LIST] : Assistance with Quad model..

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From: Beal, Weston (Weston.Beal@compaq.com)
Date: Fri Nov 12 1999 - 18:19:10 PST


Charles,

You can't define a pin twice. You can specify the capacitance as a package
pin capacitance.

Try this:

                MODEL R_1
                PIN 1 TYPE RES_VAL TO PIN 2 C:1.75
                PIN 2 TYPE RES_VAL TO PIN 1 C:1.75

                LOADSPEC RES_VAL
                REFF: 10

I didn't test this, but it seems right.

Good luck,
Weston

                -----Original Message-----
                From: Phares, Charles [mailto:charles.c.phares@intel.com]
                Sent: Friday, 12 November, 1999 5:34 PM
                To: si-list@silab.eng.sun.com
                Subject: [SI-LIST] : Assistance with Quad model..

                quad users,

                I am trying to create a model to use in quad to approximate
the "on"
                resistance and pin capacitance of essentially a cmos
transmission gate.
                ascii schematically it looks like:

                        in -------------/\/\/\/\/\/\----------------out
                                | r
                                |
                                 = = = c
                                |
                                |
                                gnd

                I was hoping that it would be as simple as putting the
following
                statements
                in a model file:

                MODEL R_1
                PIN 1 TYPE RES_VAL TO PIN 2
                PIN 1 TYPE CAP_PAR
                END_MODEL

                LOADSPEC RES_VAL
                REFF: 10

                LOADSPEC CAP_PAR
                CEFF: 3.5

                But, unfortunately, the TOP file only reads the series
resistance
                parameter
                and leaves out the cap. I guess it just doesn't like the
dual pin
                definition. It doesn't give me an error though.

                Can anyone think of a slick way to make this model, using
TOPSPEC or
                something like that?

                Thanks,
                Charles Phares

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