RE: [SI-LIST] : Point to Point Timing Budget and BER Calculations

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From: Smith, Norm W (NS121846@exchange.SanDiegoCA.NCR.COM)
Date: Wed May 17 2000 - 14:31:07 PDT


Tony,

I would recommend you visit http://www.t11.org <http://www.t11.org> and go
to the home page <http://www.schelto.com> of the T11.2 Chair, Schelto Van
Doorn <mailto:Schelto.van-doorn@infineon.com> of INFINEON TECHNOLOGIES. In
Schelto Van Doorn <mailto:Schelto.van-doorn@infineon.com> 's, home page you
will find a Math Cad file under the MJS working group. The file contains a
mathematical model for BER prediction based on RJ and DJ variables. When I
played with the model, it showed that the BER is very sensitive to RJ. For
example, increasing the RJ from 10ps to 20ps will dramatically increase your
BER.

Norm Smith
NCR Corp
San Diego

        The question is: Given we cannot simulate Random Jitter, how much
margin
        do you need to garuntee a very low BER? Can you mathmatically
predict
        BER based on a deterministic Jitter Budget?

        If you have very small margin let's say 10ps with your deterministic
        budget, does that mean you will have a high BER?

        --
        Anthony C. Sweeney
        Field Applications Engineer
        LSI Logic Corporation
        7585 Ronson Road
        San Diego, CA 92111
        Ph: 858-467-6980
        Fax: 858-496-0548
        Pager: 888-961-7562

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