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Understanding the different types of clock jitter

Posted: 27 Jan 2010 ?? ?Print Version ?Bookmark and Share

Keywords:clock jitter? clock jitter types? deviation clock edge?

Clock jitter is deviation of a clock edge from its ideal location. Understanding clock jitter is very important in applications as it plays a key role in the timing budget in a system. It helps the system designers understand the system timing margin.

With the increasing system data rates, timing jitter has become critical in system design, as in some instances the system performance limit is determined by the system timing margin. So a good understanding of the timing jitter becomes very important in system design. Total jitter can be separated into random jitter and deterministic jitter components. This article does not discuss the composition of jitter. It focuses on the different types of clock jitter. Clock timing jitter can be measured in time domain and in frequency domain. Cycle-to-cycle jitter, period jitter and time interval error (TIE) jitter are measured in time domain, where as phase noise and phase jitter are measured in frequency domain. Some of the sources of jitter are thermal noise, power supply noise, ground bounce, PLL circuitry, crosstalk and reflections.

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