RE: [IBIS-Users] Variety of Approaches on IBIS Modeling on Differential I/O Buffers (with and without Pre-/De-Emphasis)

Radovan,

I don't think that you will ever need the three columns
at the same time (I mean a typical column together with
a minimum or maximum column, or any other combination).
So when you extract a data set for one case, you can
delete those lines which contain the NA and keep the rest
without needing any interpolation.

Now, if this doesn't work for some reason, you could fill
the NA-s with numbers in the Perl script by interpolation
before the data is handed over to any of the *-AMS
languages.  Be careful, "NA" means "not available", not 0!
There is a big difference there, as we experienced it
with the [Driver Schedule] keyword.

Arpad
==========================================================

-----Original Message-----
From: Radovan.Vuletic@qimonda.com [mailto:Radovan.Vuletic@qimonda.com] 
Sent: Thursday, May 31, 2007 11:56 PM
To: Muranyi, Arpad; ibis-users@server.eda.org
Subject: RE: [IBIS-Users] Variety of Approaches on IBIS Modeling on Differential I/O Buffers (with and without Pre-/De-Emphasis)

Hi Arpad,

many thanks on your comments!

Just one thing about Q6 and "NA" (specially in power and ground clamps). You have right, Perl script could take care of it, but for example in this case:
  
  [GND Clamp]
  ...
  ...
  0.1500   -1.3479pA         -1.3981pA           -1.5422pA
  0.2000   -0.5872pA         -0.6494pA           -0.7990pA
  0.2392   0.0A              NA                  NA
  0.2408   NA                0.0A                NA
  0.2500   NA                NA                  -47.2574fA
  0.2532   NA                NA                  0.0A
  3.0000   0.0A              0.0A                0.0A

I agree, all "NA" in typ column and last 2 "NA" in min column could be replaced by 0.0A (already during table generation, not with Pearl script), but first "NA" in min column and all "NA" in max column can't be replaced with 0.0A, but for example, with some linear interpolation.

Problem is that above table is extracted with "s2ibis like" tool (I agree, not very perfect tool) that puts "NA" when rearranging clamp tables (to avoid double counting) and we would need to make people aware they in their clamp tables they shouldn't have any "NA" but either 0.0A or interpolated values.
Meaning, people would really need to take care about it in their extracting scripts.

Regards,
Radovan


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