[SI-LIST] Re: A query in High speed Signal Integrity analysis
- From: Ronald Miller <ron@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 19 Feb 2013 16:30:23 -0800
Hi Nithin
Data without errors is the bottom line.
Only in a time domain matters.
Although I am a RF Microwave engineer by past experience, S-Parameters
are not
intuitive in analysis.
The Impulse REsponse of the network as measured by either TDR or VNA are
useful
but must be massaged into time domain models.
Then, when the effect of the transmission line models on the eye
patterns and the
data stream, the margin for potential errors can clearly be seen.
So, the implications of your question are in error because you are
comparing apples
and oranges. Frequency domain specifications and time domain
specifications are not
directly comparable.
Good hunting.... but consider ADS for real world simulations of what is
happening.
ron miller
On 2/18/2013 10:08 PM, O Nithin Bharadwaj wrote:
> 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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--
Ronald B. Miller, Microwave/SI Engineer
Gigahertz Data Cell 510-377-9380
7721 Sunset Avenue www.ghzdata.com
Newark, CA 94560
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