Why does an eye diagram not correlate to a bathtub curve?

The eye diagram is probably the most well-known signal integrity tool because it combines numerous signal integrity characteristics such as rise/fall, overshoot/undershoot, and voltage/jitter into a simple visual of the signal. As additional layers of signal analysis and abstraction are added, there is often the need to perform a sanity check to ensure correlation to the physical layer waveforms. A case in point is understanding how a bathtub curve relates back to the eye diagram.

To read the rest of this article, please visit my Scope Guru on Signal Integrity Blog, on EDN’s site.

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