Eye Pattern

Module by: Ha Ta-Hong, Tuan Do-Hong Translated by: Ha Ta-Hong, Tuan Do-Hong

An eye pattern is the display that results from measuring a system' s response to baseband signals in a prescribed way.

Figure 1: Eye pattern

Figure 1 describe the eye pattern that results for binary binary pulse signalling. The width of the opening indicates the time over which sampling for detection might be performed. The optimum sampling time corresponds to the maxmum eye opening, yielding the greatest protection against noise. If there were no filtering in the system then the system would look like a box rather than an eye. In figure 1, DADA size 12{D rSub { size 8{A} } } {}, the range of amplitude differences of the zero crossings, is a measure of distortion caused by ISI.

JTJT size 12{J rSub { size 8{T} } } {}, the range of amplitude differences of the zero crossing , is a measure of the timmung jitter. MNMN size 12{M rSub { size 8{N} } } {} is a measure of noise margin. STST size 12{S rSub { size 8{T} } } {} is mesuare of sensity-to-timing error.

In general, the most frequent use of the eye pattern is for qualitatively assessing the extent of the ISI. As the eye closes, ISI is increase; as the eye opens, ISI is decreaseing.

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This work is licensed by Ha Ta-Hong and Tuan Do-Hong under a Creative Commons Attribution License (CC-BY 2.0).

Last edited by Ha Ta-Hong on Nov 14, 2007 5:45 am US/Central.