[SI-LIST] Re: A query in High speed Signal Integrity analysis
- From: "Syed Razeen Raj Mohamed - ERS, HCL Tech" <syed.raj@xxxxxxx>
- To: "weirsi@xxxxxxxxxx" <weirsi@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 19 Feb 2013 14:18:31 +0530
Steve,
It's not 57ohms. it is 113ohms and 95 ohms, trace width n spacing is 9.125
and 3.875 mils respectively.
Thanks & Regards
Razeen.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Tuesday, February 19, 2013 2:05 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: A query in High speed Signal Integrity analysis
Don't you mean 57 Ohms and 95 Ohms?
Steve.
On 2/18/2013 11:21 PM, O Nithin Bharadwaj wrote:
> 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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