How do I create eye diagrams with Star-Hspice?

[patrick 251]

[h=2]How do I create eye diagrams with Star-Hspice?[/h]

A: Here is an example of an eye diagram circuit in the Star-Hspice distribution:

 

/demo/awaves/demo/eyediag*

 

As a quick reference, an eye diagram simply imitates the behavior of an oscilloscope (the waveform is displayed starting from the left end of the window and moving to the right at a given rate). When the electron beam reaches the right end of the window, it is moved quickly to the left end of the window where another "cycle" can be displayed. This type of display is quite useful in observing cyclic patterns that vary slightly from one cycle to another.

 

To get these results in Star-Hspice, you need to include these two statements in your netlist:

 

.PARAM width=5ns phase=0ns

 

.PROBE TRAN TIME2=par('TIME+phase-int((TIME+phase)/width)*width')

 

This creates a new TIME2 output variable. You may adjust the width of the window (in ns) with the parameter "width". You may also adjust the phase of the waveform with the parameter "phase." To get these results in AvanWaves:

 

Open the resulting .tr# file

In the "Results Browser" window, under "Types:" select "Params"

Under "Curves:" select "time2"

Under "Current X-Axis," click on "Apply"

Under "Types:" again, select "Voltages," "Currents" or any other type of output variable you want to display

Double click on the desired signals you want to display

In the viewing window, click on the right mouse button; select "Monotonic Plot ..."

 

 

 

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