[SI-LIST] Re: Undershoot issues
- From: <art_porter@xxxxxxxxxxx>
- To: <jory_mckinley@xxxxxxxxx>, <vani.chandrasekharan@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 22 Aug 2007 07:48:13 -0600
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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