[SI-LIST] Re: Undershoot issues

  • From: <vani.chandrasekharan@xxxxxxxxx>
  • To: <art_porter@xxxxxxxxxxx>, <jory_mckinley@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 22 Aug 2007 19:40:18 +0530

=20
Hi Art Porter,

I am curious how ISI is related to undershoot, could you please
enlighten me on that?

Thanks and warm regards,
Vani
-----Original Message-----
From: art_porter@xxxxxxxxxxx [mailto:art_porter@xxxxxxxxxxx]=20
Sent: Wednesday, August 22, 2007 7:18 PM
To: jory_mckinley@xxxxxxxxx; Vani Chandrasekharan (WT01 - Embedded &
Product Engineering); si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Undershoot issues

Undershoot could be an indicator of ISI, which could increase the jitter
and lead to poor bit error rates, so you shouldn't ignore it.

Art Porter=20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Jory McKinley
Sent: Tuesday, August 21, 2007 11:08 PM
To: vani.chandrasekharan@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Undershoot issues

Undershoot may not be a problem in your case(s) depending on the
amplitude and duration.  Do you have the input specs for the devices
affected?  Most technologies have a 300mV rating or so DC level above
and below the supply and some have an AC level spec which allows for
more of an overshoot/undershoot but only for some period of time. If you
have a real problem look to better match the trace terminations with
your trace impedance and/or if budget allows slow down the drivers
somewhat.  You should be able to do this in simulation since it appears
you have reasonable lab correlation.
-Jory

----- Original Message ----
From: "vani.chandrasekharan@xxxxxxxxx" <vani.chandrasekharan@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Tuesday, August 21, 2007 11:10:22 PM
Subject: [SI-LIST] Undershoot issues


=3D20
Hi,

I am observing undershoot alone in my simulation and also in some of the
on-borad captures of some signals(single ended, less than 50MHz). I am
not sure how to mitigate this issue and how to rootcause this problem.
Kindly give me some perspective on this issue and also some options I
can try to mitigate the same.

Thanks and warm regards,
Vani


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