Clock Recovery in Serial-Data Systems

The definition of a bit period, or unit interval, is much more complicated than it looks. If it
were just the reciprocal of the data rate we'd be in worse trouble with jitter than we
already are. In this installment of Jitter 360, we investigate the true identity of the unit
interval and how serial-data systems use a recovered clock instead of an independent
reference clock. The investigation will reveal the key features of clock recovery that affect
the bit error ratio, namely bandwidth and peaking - including which part of the jitterspectrum
matters most.

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55W_21991_0 (WebID: 12843), 08-Apr-2008

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