Also, checkout Mike Li's excellent paper: http://www.altera.com/literature/cp/cp-01049-jitter-si-verification.pdf -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Conrad Herse Sent: Wednesday, November 10, 2010 10:28 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: How is the jitter spec and BER number related to each other Julia, Maxim and Agilent have some good papers on jitter, Tektronix has a good webinar series on jitter. I also suggest you look up information on the "dual-Dirac Model". Conrad Herse Alcatel-Lucent > Samit Ashdhir wrote: >> Hi Julia, >> >> A BER bathtub curve provides the relationship between the jitter spec >> and BER. The curve is the plot of BER vs. sample time from the left >> edge to the right edge of a data eye. This plot resembles a “bathtub” >> and is also referred to as a “BERT scan.” >> >> BER measurements is across the regions where data transitions occur >> (the left and right eye edges) and provide the necessary information >> to calculate TJ. TJ is quantified by noting the points where the BER >> reduces to 1E-12 (or required limit) at both eye edges. Subtracting >> that interval from the bit period provides TJ. For example, if the >> data rate is 1.25 Gb/s, the corresponding bit period is 800 ps. If a >> BER of 1E-12 occurs at 20 ps and 780 ps, then the total jitter is 800 >> – (780 – 20), or 40 ps. >> >> Agilent has some good papers explaining these more. >> >> -samit >> >> On Nov 9, 2010, at 5:08 PM, "Julia (Zhuyuan) Liu" <zliu@xxxxxxxxxx> >> wrote: >> >>> Hi, Everyone >>> XLAUI/ CAUI spec specifies the jitter tolerance in UI, assuming the >>> BER is 1e-12 or 1e-15. Does anyone know how to calculate the jitter >>> tolerance when the BER is given? >>> >>> For example, CAUI has the following note in the spec. >>> NOTE-A transmitter capable of operating at TJ = 0.3 UI and DJ = 0.16 >>> UI and receiver capable of operating at stress >>> jitter tolerance of TJ = 0.64 UI and DJ= 0.41 UI would have >>> sufficient margin for operation at approximately BER 10-15. >>> >>> >>> Thanks, >>> Julia >>> >>> >>> >>> >>> ________________________________ >>> Confidentiality Notice. >>> This message may contain information that is confidential or >>> otherwise protected from disclosure. If you are not the intended >>> recipient, you are hereby notified that any use, disclosure, >>> dissemination, distribution, or copying of this message, or any >>> attachments, is strictly prohibited. If you have received this >>> message in error, please advise the sender by reply e-mail, and >>> delete the message and any attachments. 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