User guide

The random jitter source is equipped with a 10 MHz high pass and a 100 MHz and
500 MHz low pass filter to limit the spectral range. All these filters can be disabled
or enabled by pressing the respective buttons.
Spectrally Distributed Random Jitter
Spectrally distributed random jitter is composed of two jitter sources: low
frequency jitter and high frequency jitter. It is characterized by the amplitudes of
the low and the high frequency jitter.
Spectral random jitter is characterized by
• Amplitude LF
• Amplitude HF
The filter settings graph shows the actual and the possible jitter spectrum. In
addition the total sRJ amplitude as rms value is displayed in UI and in ps. It is
calculated using following formula:
8 Jitter Tolerance Tests
428 Agilent J-BERT N4903B High-Performance Serial BERT
Filter