[SI-LIST] Re: CDR with SJ > 1UI
- From: vinod ah <ah.vinod@xxxxxxxxx>
- To: "Dhamija, Naresh" <Naresh.Dhamija@xxxxxxx>
- Date: Fri, 18 Jan 2013 12:14:15 +0530
But still the eye is closed , even after 50000 UI's right?
If the eye is closed, how can CDR work?
On Fri, Jan 18, 2013 at 11:15 AM, Dhamija, Naresh <Naresh.Dhamija@xxxxxxx>wrote:
> Hi Vinod,
>
> See it as 2UI wil be given with a freq. of 200KHz, not 5Gbps, so 2UIs will
> be closed in 50000 UIs.
>
> Regards
> Naresh
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of vinod ah
> Sent: Friday, January 18, 2013 11:09 AM
> To: SI-LIST
> Subject: [SI-LIST] CDR with SJ > 1UI
>
> 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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