Keysigth Technologies N4903B J-BERT

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15 | Keysight | J-BERT N4903B High-Performance Serial BERT, 7 Gb/s and 12.5 Gb/s - Data Sheet
igure 20. Sinusoidal jitter maximum I
Jitter Tolerance Test Specications
(continued)
Sinusoidal jitter ption J10
This injects sinusoidal jitter in the lower
freuency range with multiple Is.
Range
1
2 UI at 5 MHz
1000 UI at 10 kHz
For frequencies between 10 kHz and
5 MHz the jitter amplitude
= UI
Modulation frequency 100 Hz to 5 MHz (For higher modulation
frequencies, see Table 10)
Modulation frequency
accuracy
0.5% typical
Jitter amplitude accuracy 2% ± 1 ps typical
Impacted signals User selectable for data and aux data
outputs, clock output and trigger/ref clock
output.
1. Available range depends on modulation freuency and data rate
(see Figure 20).
10 MHz
n x f (mod)
100 Hz 10 kHz 5 MHz
2UI
n
Modulation
frequency
Jitter
amplitude
(UI)
1000 UI
n
Data rate n
Max UI at
modulation
frequency
100 Hz to 10 kHz
Max UI at
modulation
frequency
5 MHz
6.75 Gb/s to 12.5 Gb/s n = 1 1000 UI 2 UI
3.375 Gb/s to 6.75 Gb/s n = 2 500 UI 1 UI
1.6875 Gb/s to 3.375 Gb/s n = 4 250 UI 0.5 UI
843,75 Mb/s to 1.6875
Gb/s
n = 8 125 UI 0.25 UI
620 Mb/s to 843.75 Mb/s n = 16 62.5 UI 0.125 UI
Random jitter ption J10
This injects random jitter with a high band-
width and excellent crest factor.
It also allows injecting a spectrally distributed
random jitter prole as reuired for PIe 2.0
receiver test.
Range – 0 to 15.7 ps rms (0 to 220 ps pp) at
data rates < 8.1 Gb/s
– 0 to 72 mUI (0 to 1UI pp) at data rates
  s
– 0 to 8 ps rms ( 0 to 112 ps pp) if
00  lo-pass lter is turned on
sRJ If spectrally distributed random jitter (sRJ)
is used, the same limits apply to the square
root sum of LF-RJ and HF-RJ components.
See Figure 21.
Crest factor 14 (pp to rms ratio)
Bandwidth 50 kHz to 1 GHz
Filter – 10 MHz high-pass
– 100 MHz low-pass
– 500 MHz low-pass
– Can be turned on or off individually to
limit jitter bandwidth
Jitter amplitude accuracy 10% ± 0.2 ps typical
igure 21. Spectrally distributed RJ allows to inject low freuency and high
freuency RJ this is reuired for compliant PIe 2 receiver testing
Data rate
(Gb/s)
6...8 Gb/s
1.0 U I
220 ps
Jitter
amplitude
(UI)
12.5 Gb/s
Modulation
frequency
100 MHz 1 GHz10 kHz
RJ-HF
RJ-LF
1.5 MHz
RJ jitter
amplitude
(ps rms/√Hz)
Table 14. Specications for random jitter RJ
Table 13. Specications for sinusoidal jitter SJ