This paper describes what an eye diagram is, how it is constructed, and common methods of triggering used to generate one. This instrument class measures samples of the input signal to form an eye diagram that can be used for analysis of the signal's noise, jitter, and eye mask compliance. The resulting image takes on a distinct eye-like shape, from which engineers can discern important signal characteristics.
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An eye diagram is a superimposed view of multiple digital signal cycles, forming an eye-like shape. PLTS constructs measurement-based eye diagrams (or patterns) by convolving the calculated time domain impulse response (generated from frequency domain measurement data) with a synthesized pattern of bit sequences. By using an oscilloscope to create an eye diagram, engineers can quickly evaluate system performance and gain insight into the nature of channel imperfections that can lead to errors when a receiver tries to interpret the value of a bit.
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In, an eye pattern, also known as an eye diagram, is an display in which a from a receiver is repetitively sampled and applied to the vertical input (y-axis), while the data rate is used to trigger the horizontal sweep (x-axis). It is so called because, for several types of coding, the pattern looks like a series of eyes between a pair of rails.
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