RE: IBIS model creation a few comments...

Yikes, that's not a good idea for pullup and power clamp curves. What you suggest will make life much more difficult for the curves
which have to be made vcc-relative.

Sorry to be repetitive. The data are tabulated after the vcc-relative calculation, vtable=vcc-vout. After the calculation, the data
have the same range.

For a pullup curve, the following table may help:

                        (vout) (vtable)
                        sweep vcc-relative
corner vcc range range
------ --- ----- -------------
min 3.0 -3.6 > 6.3 6.6 > -3.3
typ 3.3 -3.3 > 6.6 6.6 > -3.3
max 3.6 -3.0 > 6.9 6.6 > -3.3

Regards,
Ross
-----Original Message-----
From: Kellee Crisafulli [mailto:kellee@hyperlynx.com]
Sent: Wednesday, January 05, 2000 2:32 PM
To: Stephen Nolan; ibis-users@eda.org
Subject: Re: IBIS model creation a few comments...

At 12:31 PM 1/5/00 -0600, Stephen Nolan wrote:
>In the section entitled "Making Pullup and Power Clamp Sweeps Vcc
Relative" it
>states that you should make your three sweeps Vcc relative. Example:
min=-3.6 to
>6.3, typ=-3.3 to 6.6, and max=-3.0 to 6.9.
>
>In this case, there would be table data created for the min column from
-3.6 to
>-3.3 where no typ data exists. Also, there would be data in the max column
from
>6.6 to 6.9 where no typ data exists. In those ranges, the typ column would
have
>to include NAs. Is this legal?
Yes; I believe it is legal.

However I suggest you make life simple and sweep them all from -3.6 to 6.9.
I don't see any reason not to and it eliminates the whole issue (KIS
principle).

best wishes..
Kellee

---------------------------------------------------------
Have a great day....
Kellee Crisafulli
HyperLynx, a division of Pads Software Inc.
SI,EMC,X-talk and IBIS tools for the Windows platform
E-mail: <mailto:kellee@hyperlynx.com>
web:   <http://www.hyperlynx.com>
---------------------------------------------------------
Received on Wed Jan 5 12:12:35 2000