User guide

The bounded uncorrelated jitter source is equipped with three low-pass filters with
cut-off frequencies at 50, 100, and 200 MHz. One of these filters is always active.
Random Jitter Parameters
Random Jitter is characterized by:
• Amplitude
• Filter Settings
The graph shows the possible and the current jitter spectrum, which is defined by
filter settings.
The random jitter Amplitude must be entered as an rms (root mean square) value.
The rms value corresponds to the sigma factor σ of the bell-shaped Gauss
distribution curve (see also “The Gaussian Marker” on page 237).
To modify the value, click inside the text field and enter the desired value directly
with the numeric keyboard, or use the knob close to the numeric keyboard to fine-
tune the value.
The peak-to-peak amplitude is calculated by multiplying the rms value with the
crest factor (which is currently fixed to 14). The
Amplitude p-p box shows how much of delay line capacity the setting consumes.
Jitter Tolerance Tests 8
Agilent J-BERT N4903B High-Performance Serial BERT 427
Filter
Amplitude
Amplitude p-p