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Table 20: Specifications for bounded uncorrelated jitter (BUJ)

Range 0 to 200 ps pp @ all datarates

PRBS polynomials 2

-1; n = 7, 8, 9, 10, 11, 15, 23, 31

Data rate of PRBS 200 Mb/s to 3.2 Gb/s

generator

Filters 20/50/100/200 MHz lowpass 3rd order

Jitter amplitude 10% ± 1 ps typical for settings shown in

accuracy table 21

Table 21: BUJ accuracy applies for these BUJ calibration settings.

Table 19: Specifications for random jitter (RJ)

J-BERT N4903A High-Performance Serial BERT Data Sheet 13

Random Jitter (option J10)

This injects random jitter with a

high bandwidth and excellent

crest factor.

Range 0 to 14 ps rms

Crestfactor 14 (pp to rms ratio)

Bandwidth 50 kHz to 1 GHz

Filter 10 MHz high-pass,

500 MHz low-pass.

Can be turned on/off individually

to limit jitter bandwidth.

Jitter amplitude 10% ± 0.2 ps typical

accuracy

BUJ calibration datarate for PRBS filter

setting PRBS generator

CEI 6G 1.1 Gb/s PRBS 2

-1 100 MHz

CEI 11G 2 Gb/s PRBS 2

-1 200 MHz

Gaussian 2 Gb/s PRBS 2

-1 100 MHz

Figure 20: Overview of jitter injection capabilities

Total Jitter

A combination of internally generated PJ, RJ, BUJ

and external jitter (injected using external delay con-

trol input) is possible:

For all datarates:

RJ + PJ + BUJ + external delay control input: total

delay variation is 200 ps pp max

For datarate s ≤ 3.375 Gb/s:

A 200 ps delay line or a 500 ps delay line can be

used.

If the 500 ps delay line is used: only PJ or only SJ

or only SSC can be injetced.

Total delay variation for periodic jitter is shown in

figure 17.

Total delay variation is 200 ps max. for RJ + exter-

nal delay control input.

Note: Other settings are not calibrated and do not

necessarily generate the desired jitter histograms for

all datarates of the PRBS generator.

Bounded Uncorrelated Jitter (option J10)

This injects a high-probability

jitter using a PRBS generator

and low-pass filters.

1 2 ... 8 9 10 11 12 13 14 15 16 17

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