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Table 26: Specifications for sinusoidal interference (SI)

Amplitude

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

The output signal amplitude is reduced by 3 dB when sinusoidal

interference is enabled.

Figure 26: Typical S

parameter for ISI channel of 9 inch length.

Table 25: Specifications for intersymbol interference (ISI)

Sinusoidal interference (option J20)

This adds common mode, dif-

ferential 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 sig-

nal passes through the ISI board traces (“near

end”) when using P1 as input. For “far end” injec-

tion P2 has to be used as input.

J-BERT N4903A High-Performance Serial BERT Data Sheet

Figure 25: Interference channel connectors

Interference channel (option J20)

The option J20 is only available in addition to

option J10. It includes semi-rigid cable set to

connect data outputs to P1 and P1 (N4915A-002).

Interference channel input and output (P1, P2)

User selectable board traces are

switched into the signal path to

emulate a backplane.

Figure 27: Typical ISI (measured in UI) for traces depending on datarate, pattern and trace length.

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 interfer-

ence, minimum trace length is 9 inches.

parameter See figure 26

Range See figure 27

Max. input levels -- 5 .5 V to +5.5 V

Connectors 2.4 mm, female

Specifications-Jitter Tolerance Test

1 2 ... 10 11 12 13 14 15 16 17 18

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