RE: [IBIS] [IBIS-Users] Differential Output terminals

Fabio,
 
There is no reason to make two [Model]s with the
same data in them for a differential pair.  You
might as well just have one [Model] and call it
twice for the diff pair.  The inversion will be
taken care of automatically by the tool for you.
 
The only reason you might need to consider two
[Model]s is if the buffer has asymmetric 
characteristics between the two outputs in its
behavior.
 
Arpad
=================================================

________________________________

From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On
Behalf Of Fabio BRINA
Sent: Monday, May 19, 2008 7:22 AM
To: ibis-users@server.eda.org; ibis@server.eda.org
Subject: [IBIS] [IBIS-Users] Differential Output terminals


Hello ibis experts,
 
I'm in the modeling of a "fully differential driver"
structure, do you think I have to consider the 
same model for both output terminals?
(I see many differential model in this way)
 
[Pin]
...
11   DOUT3-    OUTMOD
12   DOUT3+    OUTMOD
...
 
or is better to consider two model for the two output?
 
[Pin]
...
11   DOUT3-    OUTMINUS
12   DOUT3+    OUTPLUS
...
 
(in this case the [Pulldown] table of OUTMINUS have the 
 same points od [Pullup] table of OUTPLUS and viceversa?)
 
Many thanks,
Regards,
 
Fabio Brina

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