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

  • From: ckumar <ckumar@xxxxxxxxxxx>
  • To: <DBanas@xxxxxxxxxx>
  • Date: Thu, 08 Mar 2012 10:41:36 -0800

It depends on whether you have parasitics at your tx output. If there are
(like the esd caps) they should be in the circuit. If you put them inside
the ami model you will simply miss the interaction (reflections) between
the parasitics and the pkg/pcb channel.

if you have the circuit models you can test it with two different of the
ami model and compare it against circuit simulation for different channels

On Thu, 8 Mar 2012 10:15:05 -0800, David Banas <DBanas@xxxxxxxxxx> wrote:
> 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<http://www.altera.com/>
> +1-408-544-7667 - desk
> 
> Did you know Altera offers over 150 free online technical training
>
courses<http://www.altera.com/servlets/searchcourse?coursetype=Online&WT.mc_id=t9_ot_mi_mi_tx_a_311>?
> Take one today!
> 
> 
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