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In telecommunications, an eye pattern, also known as an eye diagram, is an oscilloscope display in which a digital signal 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 ...
An eye pattern, which overlays many samples of a signal, can give a graphical representation of the signal characteristics. The first image above is the eye pattern for a binary phase-shift keying (PSK) system in which a one is represented by an amplitude of −1 and a zero by an amplitude of +1. The current sampling time is at the center of ...
As a practical tool to determine ISI, one uses the Eye pattern, that visualizes typical effects of the channel and the synchronization/frequency stability. The signal's spectrum is determined by the modulation scheme and data rate used by the transmitter, but can be modified with a pulse shaping filter.
It is common to analyze the results with an eye pattern and by calculating a timing budget. [3] Modern signal integrity tools for IC design perform all these steps automatically, producing reports that give a design a clean bill of health, or a list of problems that must be fixed.
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Continuous-time Partial-Response (class 4) and corresponding 'eye pattern' Partial-response was first proposed by Adam Lender in 1963. [2] The method was generalized by Kretzmer in 1966. Kretzmer also classified the several different possible responses, [3] for example, PR1 is duobinary and PR4 is the response used in the classical PRML.
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