lecture15_ee689_jitter

# lecture15_ee689_jitter - ECEN689 Special Topics in...

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Sam Palermo ECEN689: Special Topics in High-Speed Links Circuits and Systems Spring 2011 Lecture 15: Jitter

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Agenda Jitter Definitions Jitter Categories Dual Dirac Jitter Model System Jitter Budgeting Reference Material Jitter application notes posted on website Majority of today’s material from Hall reference 2
Eye Diagram and Spec Mask Links must have margin in both the voltage AND timing domain for proper operation For independent design (interoperability) of TX and RX, a spec eye mask is used 3 Eye at RX sampler RX clock timing noise or jitter (random noise only here) [ Hall ]

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Jitter Definitions Jitter can be defined as “the short-term variation of a signal with respect to its ideal position in time” Jitter measurements Period Jitter (J PER ) Time difference between measured period and ideal period Cycle to Cycle Jitter (J CC ) Time difference between two adjacent clock periods Important for budgeting on-chip digital circuits cycle time Accumulated Jitter (J AC ) Time difference between measured clock and ideal trigger clock Jitter measurement most relative to high-speed link systems 4
Jitter Statistical Parameters Mean Value Can be interpreted as a fixed timing offset or “skew” Generally not important, as usually can corrected for RMS Jitter Useful for characterizing random component of jitter Peak-to-Peak Jitter Function of both deterministic (bounded) and random (unbounded) jitter components Must be quoted at a given BER to account for random (unbounded) jitter 5

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Jitter Calculation Examples 6 n 1 2 3 4 Mean RMS PP J PER -0.06 0.02 -0.06 0.12 0.005 0.085 0.18 J CC 0.08 -0.08 0.18 - 0.06 0.131 0.26 J AC -0.07 -0.05 -0.11 0.01 -0.055 0.05
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lecture15_ee689_jitter - ECEN689 Special Topics in...

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