“Beauty is in the eye of the beholder” is a phrase from the 1878 novel Molly Bawn by Margaret Wolfe Hungerford. It means that no matter what the intrinsic properties of a thing, it’s how you look at it that matters.
In our case, the “eye” we’re taking about isn’t the beholder’s eye but the eye pattern diagram of a chip-to-chip SerDes link that uses a decision feedback equalizer or DFE. People often wonder about it because has ugly-looking discontinuities in it. They even think something’s wrong with it. In fact this is how an eye pattern diagram should look with a DFE and in this video we’ll explore how and why. After watching the video, you’ll see the discontinuities are not ugly but are in fact beautiful.
If you’re interested in the mathematical detail, please see our white paper Equalization: The Correction and Analysis of Degraded Signals