jitter concept

Jitter
“The deviation from the ideal timing of an event. … Jitter is composed
of both deterministic and Gaussian (random) content.”
T11.2 / Project 1230/ Rev 10 Fibre Channel - Methodologies for Jitter Specification page 7.

http://cp.literature.agilent.com/litweb/pdf/5989-3206EN.pdf

http://www.usb.org/developers/whitepapers/USB_3_0_Jitter_Budgeting_0p5_whitepaper.pdf

http://class.ee.iastate.edu/mmina/ee418/Notes/Introduction_to_Jitter.pdf

http://www.kenkundert.com/docs/aacd97.pdf

RJ
“Jitter that is characterized by a Gaussian distribution…Random jitter is
unbounded.”
T11.2 / Project 1230/ Rev 10 Fibre Channel - Methodologies for Jitter Specification page 8

Standard deviation (1sigma) is defined as the window in which
contains 68.26% of all [measurements] to one side of the mean.

Standard Deviation is used to predict the occurrence of

outlying measurements from the mean.

RJ = $dist_normal(seed, mean, std)

DJ
“Jitter with non-Gaussian probability density function. Deterministic jitter is always
bounded in amplitude and has specific causes. Four kinds of deterministic jitter are
identified: duty cycle distortion, data dependent, sinusoidal, and uncorrelated (to the
data) bounded. DJ is characterized by its bounded, peak-to-peak value.”
T11.2 / Project 1230/ Rev 10 Fibre Channel - Methodologies for Jitter Specification page 8.

DJ = $dist_uniform(seed, 0, DJmax) - DJmax/2

SJ
SJ = SJ*sin(2*phi*f*t)

ITU-T Definition:
A Measure of the short term time variations of the significant
instances of a digital signal from their ideal positions in time.
• MJSQ Definition:
The deviation of a signal edge time at a defined amplitude of the
signal from a reference time.

Jitter Tolerance
– How much jitter on the input signal can the DUT tolerate
and still produce an acceptable bit error ratio (BER)
– Receiver measurement

There are several ways in which jitter may be measured on
a single waveform. These are period jitter, cycle-cycle jitter, and
time interval error (TIE).

http://www.iml.ece.mcgill.ca/people/professors/zilic/documents/itc07.pdf