2.5Gbps jitter generator. Part 1 final presentation. What is jitter?. By definition, jitter is the short term variation of the significant instants of a digital signal from their ideal positions in time. How does jittered signal look like?.
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Part 1 final presentation
The causes include duty-cycle distortion
(DCD), intersymbol interference (ISI), sinusoidal or periodic jitter (PJ) and crosstalk.
of a network or network element as a function of jitter
frequency. It is measured by applying sinusoidal jitter of
specified amplitude and frequency,
to the data and measuring the output jitter amplitude at
that frequency, The jitter transfer is given by
Jitter tolerance measures the ability of a device or system, primarily at the receiving end, to track large amounts of jitter without degrading the BER. It is the amplitude of sinusoidal jitter
applied to a device that results in an equivalent 1 dB reduction in sensitivity. The measurement is performed by first measuring the BER of the Device Under Test (DUT) without applied jitter. The signal power is attenuated until the onset of errors or until a specified BER, typically , is exceeded …
The attenuation is reduced 1 dB and the signal is transmitted with applied sinusoidal jitter imposed on the clock. The jitter amplitude is increased until the onset of errors or the specified BER is exceeded. The resulting
jitter amplitude is the jitter tolerance at that frequency,
Jitter tolerance and transfer are primarily of interest in SONet/SDH/OTN applications.
NB4N11M DJ = 20ps
NB4N11MRJ (rms) = 1ps
SY100EP195 DJ = 25ps (DCD)
SY100EP195 RJ (rms) = 0.2ps
RocketIO TX DJ = 15 ps (DCD)
coupling, as well as low-pass effects (ISI).
This amount will be estimated from Hyperlynx
rate of change of a digital control word to programmable delay chip.
Since the highest modulation frequency of
interest in the SONET OC-48 mask is about
it’s sufficient to change delays at about 50-100MHz,
to rich specification frequency range