Keysigth Technologies N4903B J-BERT

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16 | Keysight | J-BERT N4903B High-Performance Serial BERT, 7 Gb/s and 12.5 Gb/s - Data Sheet
Bounded uncorrelated jitter ption J10
This injects a high probability jitter using a
PRBS generator and low-pass lters.
Jitter Tolerance Test Specications
(continued)
sRJ
PJ
1
RJ
BUJ
External
delay
+
+
+
220 ps data & aux data on
220 ps forw arded clock on
C lock
Trigger/
ref clock
Data
Aux data
Clock & data
Modulation signal
Functional coupling
rSSC
SSC
SJ
PJ
2
Internal clock
oscillator
PLL
6.75 Gb/s ... 12.5 Gb/s
External
clock
Clock
source
selection
x/y
1/z
Aux clock
1/1 or 1/2
1/n
Clock
modulator
1
D elay modulation
220 ps
ISI
P1
P2
Jitter delay
D elay modulation
610 ps
2
D elay modulation
220 ps
S.I.
+
External
Total jitter
A combination of internally generated SJ/SS/rSS PJ RJ BJ
and external jitter injected using external delay control input is
possible.
The overall jitter composition does reduce the available jitter
budget of the respective jitter sources.
igure 22. verview of jitter injection capabilities
1. hen using the cloc modulator in external cloc mode the external cloc must be  6.75 Gz.
2. hen using the 610 ps delay line in external cloc mode the external cloc must be  6.75 Gz and z  4.
BUJ calibration
setting
1
Data rate for
PRBS
generator
PRBS Filter
CEI 6G 1.1 Gb/s PRBS 29 - 1 100 MHz
CEI 11G 2 Gb/s PRBS 211-1 200 MHz
Gaussian 2 Gb/s PRBS 231-1 100 MHz
1. ther settings are not calibrated and do not necessarily generate the
desired jitter histograms for all datarates of the PRBS generator.
Range 0 to 1.1 UI (not to exceed capabilitiy of delay
line used)
PRBS polynomials 2
n
-1; n = 7, 8, 9, 10, 11, 15, 23, 31
Data rate of PRBS
generator
200 Mb/s to 3.2 Gb/s
Filters 50/100/200 MHz lowpass 3rd order
Jitter amplitude accuracy 10% ± 1 ps typical for settings shown in
Table 15.
Table 15. Specications for bounded uncorrelated jitter BJ
Table 16. BJ accuracy applies for these BJ calibration settings