Jitter generation caused by voltage fluctuation
Reference clock jitter and analog voltage fluctuation can degrade eye patterns.
Since jitter is caused by the PI issue, suppressing jitter using just SI tools can only go so far. The following figure shows the effect before and after a filter is added for power IC. After the filter is added, the eye diagram becomes clearer and has a wider eye opening.
Verifying Analysis Accuracy
The following graph compares the results of an actual measurement (blue line) and PIStream calculation (pink line). S21 calculated by PIStream and S21 by actual measurement shows a correlation up to 3 GHz. When PIStream cannot calculate S21, it uses an output analysis model.
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