Figure 1: Manual jitter composition. This allows a combination
of jitter types to be injected.
4 J-BERT N4903A High-Performance Serial BERT Data Sheet
Jitter Tolerance Tests
Calibrated Jitter Injection:
• Periodic Jitter (option J10)
• Sinusoidal Jitter (option J10)
• Random Jitter (option J10)
• Bounded Uncorrelated Jitter (option J10)
• Intersymbol Interference (ISI) (option J20)
• Sinusoidal Interference (option J20)
External Jitter Injection:
Using an external source connected to delay
control input.
User Controls
Manual Jitter Composition (option J10)
of PJ, SJ, RJ, BUJ, ISI and Sinusoidal Interference.
This screen allows the user to set up combinations
of jitter types and jitter magnitudes easily. Therefore
a calibrated ‘stressed eye’ with more than 50% eye
closure can be set up for receiver testing. Additional
jitter can be injected with the interfence channel
(Opt. J20). It adds ISI and differential/single mode
noise.
Automated Jitter Tolerance Characterization (option J10)
Automated sweep over SJ frequency based on the
start/stop frequency, steps, accuracy, BER-level, con-
fidence level and DUT relax time. The green dots
indicate where the receiver tolerated the injected jit-
ter. The red dots show where the BER level was
exceeded. This automated characterization capability
saves significant programming time.
Automated Jitter Tolerance Compliance (option J12)
Automatically tests compliance against a receiver’s
jitter tolerance curve limits specified by a standard
or the user. Most of the popular serial bus standards
define jitter tolerance curves. This option includes a
library of jitter tolerance curves for: SATA, Fibre
Channel, 10 GE/XAUI, CEI 6/11G, and XFI/XFP.
Pass/Fail is shown on a graphical result screen,
which can be saved and printed.
Figure 2: Automated jitter tolerance characterization. The green
circles show where DUT works within the required BER-level.
Figure 3: Result screen of the automated jitter tolerance compli-
ance. A library of jitter tolerance curves are available.
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