Agilent Technologies J-BERT N4903B Manual de usuario descargar pdf (Pagina 17)

Jitter Tolerance Test Speciﬁcations

Figure 23. Interference channel connectors

Figure 24. Typical S21 parameter for ISI channel of 9 inch length

Table 18. Typical ISI (measured in UI) for traces depending on data rate, pattern and trace length.

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

-1

PRBS

-1

CJPAT PRBS

-1

PRBS

-1

CJPAT PRBS

-1

PRBS

-1

CJPAT PRBS

-1

PRBS

-1

CJPAT PRBS

-1

PRBS

-1

CJPAT PRBS

-1

PRBS

-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

Sinusoidal interference (Option 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. For “far end”

injection P2 has to be used as input.

Table 19. 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

1. The output signal amplitude is reduced by 3 dB when sinusoidal interference

is enabled.

Interference channel (Option J20)

The Option J20 is only available in addition to Option J10. It

includes the semi-rigid cable set to connect data outputs to P1

and P1 (N4915A-008).

Interference channel input and output (P1, P2)

User selectable board traces are switched into

the signal path to emulate a backplane.

Table 17. Speciﬁcations 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

parameter See Figure 24

Range See Table 17

Max input levels -5.5 V to +5.5 V

Connectors 2.4 mm, female

-50

-40

-30

-20

-10

Frequency [Hz]

S21 [dB]

1 GHz0.1 GHz 10 GHz

20 GHz

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

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Agilent Technologies J-BERT N4903B Manual de usuario Pagina 17

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