[SI-LIST] Re: A query in High speed Signal Integrity analysis
- From: "Mohanty, Sarada" <Sarada.Mohanty@xxxxxxx>
- To: "Syed Razeen Raj Mohamed - ERS, HCL Tech" <syed.raj@xxxxxxx>
- Date: Tue, 19 Feb 2013 14:14:05 +0530
Hi Razeen,
This Spacing very less to transfer Capacitive coupling current between adjacent
traces so that that will produce common model voltage ,Could you please check
with your fabricator in order to achieve this differential impedance, Otherwise
you can any 3D field solver to calculate the Capacitive coupling .
Regards,
Sarada
-----Original Message-----
From: Syed Razeen Raj Mohamed - ERS, HCL Tech [mailto:syed.raj@xxxxxxx]
Sent: Tuesday, February 19, 2013 1:54 PM
To: Mohanty, Sarada
Subject: RE: A query in High speed Signal Integrity analysis
The width and spacing for the trace is 9.125mils 3.875 spacing ..
Thanks & Regards
Razeen.
-----Original Message-----
From: Mohanty, Sarada [mailto:Sarada.Mohanty@xxxxxxx]
Sent: Tuesday, February 19, 2013 1:44 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,
What is your differential trace width and spacing for the current design..
Regards,
Sardaa
-----Original Message-----
From: O Nithin Bharadwaj [mailto:nithin-bharadwaj@xxxxxxx]
Sent: Tuesday, February 19, 2013 12:52 PM
To: Mohanty, Sarada; si-list@xxxxxxxxxxxxx
Cc: Syed Razeen Raj Mohamed - ERS, HCL Tech
Subject: 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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