[SI-LIST] Re: A query in High speed Signal Integrity analysis
- From: "Mohanty, Sarada" <Sarada.Mohanty@xxxxxxx>
- To: "syed.raj@xxxxxxx" <syed.raj@xxxxxxx>, "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>, "weirsi@xxxxxxxxxx" <weirsi@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 19 Feb 2013 15:12:41 +0530
Common mode return loss may deal with EMI issue basically ,We need to find out
how the way to reduce this by using common model termination in designing.
Regard,
Sarada
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Syed Razeen Raj Mohamed - ERS, HCL Tech
Sent: Tuesday, February 19, 2013 2:51 PM
To: Havermann, Gert; weirsi@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: A query in High speed Signal Integrity analysis
It's a micro strip line with 37.7 mil separation to the reference plane with cu
of 1.95 finished thickness.
I guess the calculations are correct as I'd simulated the same in 3D Software
and TDR plots which showed closer values to the calculated.
Also my channel meets the Diff Return loss requirements, Will this be a serious
issue if my channel fails Common mode RL
Thanks & Regards
Razeen.
-----Original Message-----
From: Havermann, Gert [mailto:Gert.Havermann@xxxxxxxxxxx]
Sent: Tuesday, February 19, 2013 2:41 PM
To: Syed Razeen Raj Mohamed - ERS, HCL Tech; weirsi@xxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: AW: [SI-LIST] Re: A query in High speed Signal Integrity analysis
I just calculated a bit, and there seems tob e an error in your calculations.
For a single ended stripline this would mean 200mil spacing between GND planes.
Using this spacing with your 3.875mil separation the differential impedance is
78.81Ohm.
This doesn't seem realistic. Could you provide more information of your
impedance Cell?
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Syed Razeen Raj Mohamed - ERS, HCL Tech
Gesendet: Dienstag, 19. Februar 2013 09:49
An: weirsi@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: A query in High speed Signal Integrity analysis
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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