[ibis-macro] Re: Analog Buffer Model Inside DLL

  • From: Todd Westerhoff <twesterh@xxxxxxxxxx>
  • To: "gedlund@xxxxxxxxxx" <gedlund@xxxxxxxxxx>
  • Date: Wed, 12 Dec 2012 13:30:36 -0500 (EST)

Greg,

That is not possible. The analog model, by definition, interacts with the 
channel and must be included in the impulse response. The equalization, also by 
definition, is considered to be electrically isolated from the channel and is 
thus represented in the DLL.

Putting the analog model in the DLL violates a fundamental assumption of 
IBIS-AMI. You may get good-looking results, but they will be invalid.

Todd.


-- 

Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA 01754
(978) 461-0449 x24
twesterh@xxxxxxxxxx
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On Dec 12, 2012, at 1:13 PM, Gregory R Edlund <gedlund@xxxxxxxxxx> wrote:

> What nasty things are likely to happen if someone puts the analog buffer 
> model inside the DLL?  At the very least, the impulse response will be 
> incorrect.
> 
> Are there any circumstances under which this can work correctly?
> 
> Greg Edlund
> Senior Engineer
> Signal Integrity and System Timing
> IBM Systems & Technology Group
> 3605 Hwy. 52 N  Bldg 050-3
> Rochester, MN 55901
>

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