Eye diagrams are a very powerful tool for
visual diagnosis of the degree of distortion and noise introduced by the channel
(including TX and RX processing) and of any errors in symbol timing recovery.
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Often, however, it is not possible to observe the eye diagram at the correct point in the circuit, namely after any receiver filtering
where the full (hopefully) Nyquist response should be seen, as this may be buried within
an IC implementation.
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