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Figure 22: Typical S

parameter for ISI channel of 9 inch length

Table 22: Specifications for intersymbol interference (ISI)

Sinusoidal Interference (option J20)

This adds common mode, differ-

ential or single-ended sine wave

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. For “far end” injection

P2 has to be used as input.

14 J-BERT N4903A High-Performance Serial BERT Data Sheet

Table 23: 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 21: 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 con-

nect 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 23: 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 22

Range See figure 23-

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

Connectors 2.4 mm, female

1 2 ... 9 10 11 12 13 14 15 16 17

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