Keysigth Technologies N4903B J-BERT

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17 | Keysight | J-BERT N4903B High-Performance Serial BERT, 7 Gb/s and 12.5 Gb/s - Data Sheet
Jitter Tolerance Test Specications
(continued)
Interference channel ption J20
The ption J20 is only available in addition to ption J10. It
includes the semi-rigid cable set to connect data outputs to P1
and P1 N4915A-008.
igure 23. Interference channel connectors
Interference channel input and output P1 P2
ser selectable board traces are switched into
the signal path to emulate a bacplane.
Table 17. Specications for inter symbol interference ISI
Trace length 3.5” (minimum), 9” (minimum with S.I. enabled) 16”, 20”,
24”, 28”, 32”, 36”, 40”, 44” inches of board trace type
Nelco 4000-6. When using in combination with
sinusoidal interference, minimum trace length is 9 inches
S
21
parameter See Figure 24
Range See Table 17
Max input levels -5.5 V to +5.5 V
Connectors 2.4 mm, female
igure 24. Typical S21 parameter for ISI channel of 9 inch length
Sinusoidal interference ption J20
This adds common mode, differential or
single-ended sinewave signal on top of the
data outputs to test common mode rejection
of a receiver and to emulate vertical eye
closure. Sinusoidal interference is injected
before the signal passes through the ISI board traces near end
when using P1 as input. or far end injection P2 has to be used
as input.
-50
-40
-30
-20
-10
0
Frequency [Hz]
S21 [dB]
1 GHz0.1 GHz 10 GHz 20 GHz
Amplitude
1
0 to 400 mV common mode, single ended and
differential (differential amplitude 0 to 800 mV)
Frequency 10 MHz to 3.2 GHz in 100 kHz steps
Level accuracy ± 10% ± 10 mV typical
1. The output signal amplitude is reduced by 3 dB when sinusoidal
interference is enabled.
Data
rate
1.25 Gb/s 2.5 Gb/s 3.125 Gb/s 5 Gb/s 6.25 Gb/s 11 Gb/s
ISI trace
length
PRBS
2
7
-1
PRBS
2
15
-1
CJPAT PRBS
2
7
-1
PRBS
2
15
-1
CJPAT PRBS
2
7
-1
PRBS
2
15
-1
CJPAT PRBS
2
7
-1
PRBS
2
15
-1
CJPAT PRBS
2
7
-1
PRBS
2
15
-1
CJPAT PRBS
2
7
-1
PRBS
2
15
-1
CJPAT
3.5
inches
0.062 0.043 0.101 0.133 0.109
9 inches < 0.050 0.051 0.070 0.099 0.138 0.096 0.130 0.185 0.126 0.389 0.501 0.378
16
inches
0.095 0.129 0.094 0.123 0.171 0.119 0.264 0.348 0.280 0.348 0.468 0.393
20
inches
0.068 0.051 0.139 0.180 0.134 0.183 0.263 0.171 0.393 0.507 0.400 0.532
24
inches
0.069 0.091 0.071 0.181 0.238 0.198 0.253 0.357 0.253 0.491
28
inches
0.094 0.123 0.097 0.253 0.319 0.261 0.342 0.479 0.351
32
inches
0.118 0.151 0.126 0.313 0.398 0.318 0.440 0.584 0.446
36
inches
0.150 0.189 0.157 0.391 0.503 0.410 0.510
40
inches
0.182 0.227 0.191 0.469 0.597 0.496
44
inches
0.213 0.267 0.220 0.564
Table 18. Typical ISI measured in I for traces depending on data rate pattern and trace length
Table 19. Specications for sinusoidal interference SI