lecture15_ee689_jitter

lecture15_ee689_jitter - ECEN689 Special Topics in...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Sam Palermo ECEN689: Special Topics in High-Speed Links Circuits and Systems Spring 2011 Lecture 15: Jitter
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 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 ]
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 25

lecture15_ee689_jitter - ECEN689 Special Topics in...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online