BUJ calibration datarate for PRBS filter
setting PRBS generator
CEI 6G 1.1 Gb/s PRBS 2
9
-1 100 MHz
CEI 11G 2 Gb/s PRBS 2
11
-1 200 MHz
Gaussian 2 Gb/s PRBS 2
31
-1 100 MHz
Table 23: Specifications for bounded uncorrelated jitter (BUJ)
Range 0 to 200 ps pp @ all datarates
PRBS polynomials 2
n
-1; n = 7, 8, 9, 10, 11, 15, 23, 31
Data rate of PRBS 200 Mb/s to 3.2 Gb/s
generator
Filters 20/50/100/200 MHz lowpass 3rd order
Jitter amplitude 10% ± 1 ps typical for settings shown in
accuracy table 24.
Table 24: BUJ accuracy applies for these BUJ calibration settings.
14 J-BERT N4903A High-Performance Serial BERT Data Sheet
Random jitter (option J10)
This injects random jitter with a
high bandwidth and excellent
crest factor.
Table 22: Specifications for random jitter (RJ)
Range 0 to 14 ps rms
Crestfactor 14 (pp to rms ratio)
Bandwidth 50 kHz to 1 GHz
Filter 10 MHz high-pass
500 MHz low-pass
Can be turned on/off individually
to limit jitter bandwidth.
Jitter amplitude 10% ± 0.2 ps typical
accuracy
Note: Other settings are not calibrated and do not neces-
sarily generate the desired jitter histograms for all
datarates of the PRBS generator.
Figure 24: Overview of jitter injection capabilities
Total jitter
A combination of internally generated PJ, RJ, BUJ
and external jitter (injected using external delay
control input) is possible:
For all datarates: RJ + PJ + BUJ + external delay
control input: total delay variation is
200 ps pp max.
For datarates
~
3.375 Gb/s: A 200 ps delay line
or a 500 ps delay line can be used.
If the 500 ps delay line is used: only PJ or only SJ
or only SSC can be injected.
Total delay variation for periodic jitter is shown in
figure 21.
Total delay variation is 200 ps max. for RJ + exter-
nal delay control input.
Bounded uncorrelated jitter (option J10)
This injects a high probability
jitter using a PRBS generator
and low-pass filters.
Specifications-Jitter Tolerance Test
[1]: When 500ps delay line is used for PJ, additional SSC,
SJ and BUJ is not available. The 200ps delay can be used in
addition, see above for maximum available total jitter.
[2]: When using Automated Characterization/ Compliance:
sinusoidal jitter sweep is generated by SJ and PJ (200 ps
delay line). Additional PJ or SJ cannot be injected. SSC can
be enabled (requires SW rev. 4.5 or later). With SSC
enabled only PJ (200ps delay line) is used for jitter sweep.
[3]: When using CLK IN (external) SSC, SJ and 500 ps delay
line are not available. It is possible to inject a modulated
external clock which must not exceed J-BERT‘s built-in jit-
ter injection capabilities for SSC/SJ or the 500 ps delay
line.
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