[ibis-macro] Question at IBIS Summit
- From: Bob Ross <bob@xxxxxxxxxxxxx>
- To: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- Date: Tue, 20 Sep 2005 10:38:59 -0700
Arpad:
You asked at the Summit meeting why the bottom side
pre-emphasis (de-emphasis) was less than the top side
in slide 8 of ross1.pdf for the SPICE simulation.
My (expanded) response was that the pulldown impedance
(of the Main) varied over the full range (1.8 V to .5 V),
and the lower impedance (as seen by the Boost) at the
lower end accounted for the reduced de-emphasis amplitude.
This is also seen later in all the IBIS simulations when
the buffer is constructed with [Driver Schedule] which
take into account all the load interactions.
The pre-emphasis template in Todd's presentation westerhoff.pdf
slide 8 show the connection through an Adder function. This
appears to remove any interactive load dependency. Is
this correct? If so, then we need a different method of
combination in the template to correctly mimic some real world
situations.
Bob
--
Bob Ross
Teraspeed Consulting Group LLC Teraspeed Labs
121 North River Drive 13610 SW Harness Lane
Narragansett, RI 02882 Beaverton, OR 97008
401-284-1827 503-430-1065
http://www.teraspeed.com 503-246-8048 Direct
bob@xxxxxxxxxxxxx
Teraspeed is a registered service mark of Teraspeed Consulting Group LLC
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