J-BERT N4903A High-Performance Serial BERT Data Sheet
4
Figure 1: Manual jitter composition. This allows a combination
of jitter types to be injected.
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
interference channel (option 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,
confidence level and DUT relax time. The green
dots indicate where the receiver tolerated the
injected jitter. The red dots show where the BER
level was exceeded. By selecting a tested point, the
jitter setup condition is restored for further analy-
sis (with SW 4.5 or later). The compliance curve
can be shown on the result screen for immediate
result interpretation (with SW 4.5 or later). This
automated
characterization capability saves significant
programming time.
Automated jitter tolerance compliance (option J12)
It automatically tests compliance against a receiv-
er’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 GbE/XAUI, CEI 6/11 G, and XFP/XFI. Pass/fail
is shown on a graphical result screen, which can
be saved and printed. A comprehensive compli-
ance report, including the jitter setup and total jit-
ter results for each test point, can be generated
and saved as a html file for simple jitter tolerance
test documentation.
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 is available.
Jitter Tolerance Tests
(482 paginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales