FreeLists / si-list / [SI-LIST] Differential Timing in IBIS

["Timothy Coyle" <Timothy.Coyle@xxxxxxx>]

Hi,
I am wondering how I might "measure" the Output Buffer delay for a
differential output.  For a single-ended device, I would use the Rref,Cref,
and Vref load and measure the time
it takes the output to reach Vmeas.  However, for a differential output
that swings from -400mV to 400mV, how would I measure the Output Buffer
Delay? A differential output is
defined single-ended in IBIS, so for example an LVDS differential output
might have a Rref of 50 Ohms (100 Ohms differential) and a Vref of 1.25 V.
(The Vos of the device)
Would I use this test load to get the Output Buffer Delay?  Can simulators
like XTK and SpecctraQuest "apply" this delay to the differential signal?
In Signal Explorer
(in SpecctraQuest), if I use the single-ended Output Buffer Delay, this is
the same buffer delay that shows up for my differential signal.

Thanks,
Tim




------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu