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133 SNA5000A Vector Network Analyzer User Manual
5.8.3 Stimulus Signal Setup
5.8.3.1 Logic Level
To change the logic level of the input signal, set the value in the One Lv. or Zero Lv.
textbox in the Stimulus box.
5.8.3.2 Data Rate
The data rate of the signal is the number of bits transmitted per second, which reflects the
base frequency of the signal. Considering the lowpass characteristics of transmission systems
in reality, the transmission becomes bad with a large data rate, and the signal integrity analysis
becomes important.
To change the data rate of the input signal, set the value in the Data Rate textbox in the
Stimulus box.
5.8.3.3 Rise Time
The rise time of the signal reflects the steepness of the transition edge. The smaller rise
time means the higher degree of steepness, the larger proportion of high-frequency parts, and
the more serious high-frequency losses can be during transmission. It's effective to widen the
eye by reducing the rise time properly. But too small a rise time leads to ringing phenomena at
the logic level of the output signal, resulting in the decrease of the eye height.
To change the rise time type or value of the input signal, operate the Rise Time pull-down
menu or textbox in the Stimulus box.
5.8.4 Eye Diagram Analysis
During the eye diagram simulation, the option analyzes the eye diagram automatically
and try to get the numerical characteristics as follow: Rise Time, Fall Time, Jitter, Crossing
Percent, Opening Factor, The Ratio of Signal to Noise, Duty Cycle Distortion, Level
One, Level Zero, Level Mean, Amplitude, Height, Width. And Rise Time, Fall Time, Jitter
(peak-peak value), Amplitude, Height, Width are allowed to be marked on the eye diagram
to conveniently obtain the characteristics of the eye diagram.
5.8.4.1 Analysis Result Overlay
To switch on or off the data analysis markers on the diagram, click the Overlay checkbox
in the Result bar.
5.8.4.2 Rise Time in Data Analysis
To change the rise time type for data analysis of eye diagrams, click the Rise Time Def.
pull-down menu in the Result bar.
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