[SI-LIST] Relation between slew rate and ISI
- From: "Preethi Ramaswamy" <preethi.gowtham@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 6 May 2008 15:52:04 -0700
I'm looking for some information on the relation between slew rate and ISI
effect on high speed memory data signals.
From my SI simulation I'm observing that a signal looks much worse with a
higher slew rate than a lower slew rate. But the point I'm tapping is not at
the receiver but a point before the receiver. I don't expect the signal to
look as good as at the receiver but I was hoping that the trends match. At
the receiver itself, the fast corner signal looks better than the slow
corner signal. The bus is properly terminated.
Looking at the waveform, I see that in the fast corner case, whenever there
is a 1010 pattern, the signal is not reaching its intended Vhigh and Vlow
level. A similar thing happens at the slow corner but the signal swing is
much better. Hence, the eye diagram in the fast corner is almost closed
whereas the slow corner looks open.
While searching some artciles on this, I found the opposite stated. It said
that ISI effects are more pronounced in the slow corner case and Crosstalk
is more pronounced in the fast corner case.
Any experience or insight into this topic would be very helpful.
------------------------------------------------------------------
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:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//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
Other related posts:
