[ibis-macro] Re: Question on dividing up the Tx behavior between the AMI and analog portions of the model

  • From: Gregory R Edlund <gedlund@xxxxxxxxxx>
  • To: DBanas@xxxxxxxxxx
  • Date: Thu, 8 Mar 2012 16:00:00 -0600

That was a good question, eh?  I'm going to mark that one down for the
quality check list.  And I really like Scott's idea about pathological
cases.  We should cook up a set of channels that beat up the AMI models.

Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N  Bldg 050-3
Rochester, MN 55901





From:   David Banas <DBanas@xxxxxxxxxx>
To:     "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
Date:   03/08/2012 12:17 PM
Subject:        [ibis-macro] Question on dividing up the Tx behavior between
            the AMI and analog portions of the model
Sent by:        ibis-macro-bounce@xxxxxxxxxxxxx



Hi all,

Is it customary to split up the Tx behavior, such that the FFE is modeled
in the AMI model and the pulse shaper in the analog model?
Or, is there a different dividing line that has been identified as “best
practice”.
(Or, am I completely off in the weeds?)

The context for this question: I just managed to get good correlation
between our latest Tx AMI model and the HSPICE model.
And then I realized that, having dumped all of the behavior into the AMI
model, I would need to put an ideal step function into the V-T curves of
the analog IBIS model. And I wasn’t sure that would be a good idea. (I’m
guessing that that would reek havoc in most simulators; is that correct?)

Thanks,

David Banas
Sr. Member Technical Staff
Altera
+1-408-544-7667 - desk

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