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J-BERT N4903A High-Performance Serial BERT Data Sheet

Figure 5: Spectral jitter decomposition for debugging jitter

sources in a design.

Figure 6: Eye contour with colors indicating BER level.

Figure 7: BERT scan including RJ/DJ separation, total jitter.

User Interface and Measurement Suite

Quick eye diagram and masking

The quick eye diagram allows a one-shot check for

a valid signal. Due to the higher sampling depth of

a BERT, the eye contour lines visualize the meas-

ured eye at a deeper BER level for more accurate

results. Extrapolated eye contour lines display the

eye opening for even lower BER levels, such as 10

-15

, reducing the measurement time significantly.

The display shows numerical results for 1-/0-

level, eye amplitude and width, total jitter and

more. Eye masks can be loaded from a library.

Violations of the captured eye mask are displayed.

The result screen can be printed and saved for

documenting test results (see figure 4).

Spectral jitter decomposition

It measures the spectral decomposition of jitter

components. When debugging designs, the jitter

decomposition simplifies identifying deterministic

jitter sources (see figure 5).

Eye contour

The eye opening is a key characteristic of a device.

The BER is displayed as a function of sampling

delay and sampling threshold. Different views are

available: eye contour (see figure 6), pseudo colors

and equal BER plots.

BERT scan including RJ/DJ separation

This measurement shows the BER versus the sam-

pling point delay, which is displayed as a “bathtub”

curve or as a histogram. The measurement results

are displayed in a table with setup and hold time

over phase margin, total jitter in rms or peak- to -

peak, and random and deterministic jitter. The

measurement method is equivalent to IEEE

802.3ae (see figure 7).

Figure 4: Quick eye diagram with BER contour and masking.

User Interface

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