Agilent Technologies J-BERT N4903B Bedienungsanleitung PDF herunterladen (Seite 16)

Bounded uncorrelated jitter (Option J10)

This injects a high probability jitter using a

PRBS generator and low-pass filters.

Table 15. Speciﬁcations for bounded uncorrelated jitter (BUJ)

Range 0 to 1.1 UI (not to exceed capabilitiy of

delay line used)

PRBS polynomials 2

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

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

Filters 50/100/200 MHz lowpass 3rd order

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

in Table 16.

Jitter Tolerance Test Speciﬁcations

Figure 22. Overview of jitter injection capabilities.

Table 16. BUJ accuracy applies for these BUJ calibration settings

BUJ

calibration

setting

Data rate for

PRBS generator

PRBS Filter

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

1. Other settings are not calibrated and do not necessarily generate the desired

jitter histograms for all datarates of the PRBS generator.

sR J

R J

BU J

Exte rna l

delay

220 ps data & aux data on

220 ps for w ar ded clock on

C lock

Trigger/

ref clock

Data

Aux data

Clock & data

M odulation sig n a l

F unctional co u p lin g

rSSC

SSC

Internal clock

oscillator

PLL

6.75 Gb/s ... 12.5 Gb/s

Exter nal

clock

C lock

source

selec tion

x/y

1/z

Aux clock

1/1 or 1/2

1/n

C lock

modulator

D elay modulation

220 ps

ISI

Jitter delay

D elay modulation

610 ps

D elay modulation

220 ps

S.I.

Exte rna l

Total jitter

A combination of internally generated SJ/SSC/rSSC, PJ, RJ, BUJ

and external jitter (injected using external delay control input) is

possible.

The overall jitter composition does reduce the available jitter

budget of the respective jitter sources.

1. When using the clock modulator in external clock mode, the external clock must be > 6.75 GHz.

2. When using the 610 ps delay line in external clock mode, the external clock must be > 6.75 GHz and z = 4.

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