[SI-LIST] Re: A query in High speed Signal Integrity analysis
- From: Marc-André Filion <mfilion@xxxxxxxxxxxxxxx>
- To: <nithin-bharadwaj@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 19 Feb 2013 09:11:22 -0500
Hi,
I might be wrong here, but having the trace match with the same length
doesn't mean that you don't have problem. It all depend when they are
matched in the transmission line. You need to match your trace along the
length of it in order to make sure that you don't introduce some problem. My
rule of thumb on this is every 600 mils section must be matched.
Regards,
Marc-André Filion, ing
Concepteur Matériel / Hardware Designer
Brioconcept Consulting Inc.
450.681.2779 x2368
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of O Nithin Bharadwaj
Sent: 19 février 2013 02:22
To: Mohanty, Sarada; si-list@xxxxxxxxxxxxx
Cc: Syed Razeen Raj Mohamed - ERS, HCL Tech
Subject: [SI-LIST] Re: A query in High speed Signal Integrity analysis
Is this a problem of Tight coupling? The lengths of the P/N are the same,
since it is a Pre-SI analysis.
Single end imp was 113ohms and diff imp was 95 ohms
Is it recommended to use loose coupling or can we proceed with the current
trace width n spacing. Will there be any EMI problems because of that ??
Kindly clarify
Warm regards,
Nithin
-----Original Message-----
From: Mohanty, Sarada [mailto:Sarada.Mohanty@xxxxxxx]
Sent: Tuesday, February 19, 2013 12:04 PM
To: O Nithin Bharadwaj; si-list@xxxxxxxxxxxxx
Cc: Syed Razeen Raj Mohamed - ERS, HCL Tech
Subject: RE: A query in High speed Signal Integrity analysis
Hi Nitin,
Common mode return loss issue could be reason of mismatching differential
Skew between P/N pair and tight coupling between P/N pair. Common mode could
not always terminated because of mismatching ground reference between P/N (P
with ground & N with ground). It Can be reduced by properly terminating with
common model termination or matching with P/N differential skew with tight
tolerance.
Thanks,
Sarada
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of O Nithin Bharadwaj
Sent: Tuesday, February 19, 2013 11:39 AM
To: si-list@xxxxxxxxxxxxx
Cc: Syed Razeen Raj Mohamed - ERS, HCL Tech
Subject: [SI-LIST] A query in High speed Signal Integrity analysis
Hi ,
I'm currently working on a design that operates at 6GBps. It's a Pre-SI
analysis and when I look at the s-parameters the Differential Return loss
and Insertion loss meets the requirement.
And when i observe the common mode return loss fails to meet the
requirement. What is the impact if I violate the common mode return loss
spec? What is the benefit to me beating it?
Kindly let me know your valuable comments so I can give my recommendations
to my layout team for routing.
Thanks & Regards
Razeen.
9176668688
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