[SI-LIST] Re: A query in High speed Signal Integrity analysis
- From: bala <balaseven@xxxxxxxxx>
- To: syed.raj@xxxxxxx
- Date: Wed, 20 Feb 2013 00:16:20 +0530
The stack-up seems not good...why don't you prefer generic
width/spacing...Are you using any 3D EM tool?..Model your Tline and return
path appropriately. If single ended impedance is
113ohms,differential impedance should not be 95 ohms...Whats the frequency
of the signal,whats the application of the interface...
Regards
bala
On Tue, Feb 19, 2013 at 12:46 PM, Syed Razeen Raj Mohamed - ERS, HCL Tech <
syed.raj@xxxxxxx> 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 ter be a EMI problems because of that ??
> Kindly clarify
>
> Thanks & Regards
> Razeen.
>
> -----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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--
bala
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