[SI-LIST] CDR with SJ > 1UI
- From: vinod ah <ah.vinod@xxxxxxxxx>
- To: SI-LIST <si-list@xxxxxxxxxxxxx>
- Date: Fri, 18 Jan 2013 11:09:27 +0530
Hi,
I have a basic query on serial data analysis. I am working on 5Gbps serial
link where Rx jitter tolerance test states that at 100KHz SJ with 200% UI
amplitude, we should meet BER of 1 in 10^-12.
But the part i am not able to understand is with 2UI Jitter, how will the
eye be opened as 2UI jitter means that the edge of data is shifted by an
amount greater than 1UI which means the eye is closed !!. I am not sure how
CDR circuits can recover clock with this much jitter as it might easily
fall out of the loop bandwidth.
Can serial data experts help me out in understanding the concept of eye
opening with jitter > 1UI and how CDR circuits work with such high jitter?
I went several articles on google, but for some reason was not able to find
a convincing answer.
Regards
Vinod A H
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