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135 SNA5000A Vector Network Analyzer User Manual
To change the settings of the jitter injection, click the Advanced Waveform button in the
Stimulus box of the Eye/Mask tab, or click the buttons in the Adv Waveform bar of the
Setup tab, to open the Advanced Waveform dialog. Click the Jitter button at the top of the
dialog to switch to enter the jitter setting interface.
To change the jitter type injected into the input signal, click the Random or Periodic
ratio button in the Type box. To set the jitter parameters, set the values in the corresponding
textboxes.
To select the jitter magnitude units, click the Jitter Unit pull-down menu. The unit UI
means that the time difference value between the zero time of two adjacent transition edges
in the signal, which is the default jitter magnitude unit.
To set the probability limit to display in the statistical eye diagram, click the Display
Limit pull-down menu. If the probability of the signal appearing is lower than the display limit,
it will be ignored and set to zero in the statistical eye diagrams.
To switch on the jitter injection for the next simulation after completing the jitter settings,
click the Enable checkbox in the jitter setting interface. When the jitter injection function is
switched on, the statistical eye diagram mode is enabled at the same time, the input bit
pattern type is switched to Statistical.
To switch to the statistical eye diagram mode in manual, select the option Statistical in
the Type pull-down menu in the Stimulus box. In the statistical mode, the input bit pattern is
set to PRBS with a fixed length, so the statistical eye diagrams might be slightly different in
several simulations of the same settings. The probabilities are represented by colors in the
statistical eye diagrams: Warm colors indicate a large probability, red represents the largest
ones; cold colors indicate a small probability, with deep blue representing the smallest
values.
5.9 TDR Advanced Waveform Function
The Advanced waveform function is applied in both modules of the TDR option,
TDR/TDT analysis, and eye diagram simulation, which includes viewpoint setting,
emphasis/de-emphasis, de-embedding, and Continuous Time Linear Equalization (CTLE).
The corresponding settings in the Advanced Waveform dialog, which can be opened by
clicking the buttons in the Adv Waveform bar of the Setup tab or the Advanced Waveform
button in the Stimulus box of the Eye/Mask tab.
To switch the dialog to the interface for setting the specified function, click the
corresponding button at the top of the dialog.
5.9.1 Viewpoint
To switch the viewpoint of the waveform to stimulus or responses, click the
corresponding View ratio button at the top of the dialog.
Click the ratio button before the DUT icon, switch the viewpoint to stimulus, and the
trigger mode is set to Hold/Stop, the transmission parameters show the stimulus signal only
processed by emphasis/de-emphasis, which is the signal transmitted to the DUT. Setting the
trigger mode to Continuous/Run, the viewpoint will be set to responses automatically.
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