Data-dependent jitter: Difference between revisions

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'''Data-dependent jitter''' ('''DDJ''') is a specific class of timing [[jitter]]. In particular, it is a form of [[deterministic jitter]] which is correlated with the sequence of bits in the data stream.<ref>{{cite web |url=https://www.teledynelecroy.com/doc/understanding-dj-ddj-pj-jitter-calculations |access-date=21 March 2025 |date=9 July 2014|title=Understanding Jitter Calculations: Why Dj Can Be Less Than DDj (or Pj)}}</ref><ref>{{Cite web |title=Data Dependent Jitter VI |url=https://www.ni.com/docs/en-US/bundle/labview-jitter-analysis-toolkit-api-ref/page/lvjitterphtk/data_dependent_jitter.html |access-date=2025-03-21 |website=www.ni.com}}</ref> It is also a form of [[Intersymbol interference|ISI]].

==Properties==

Depending on characteristics of the [[Analog signal|signal]] and [[Transmission line|transmission]] topology, previously transmitted symbols can affect the edge cross over time. This creates a [[Probabilityprobability distribution]] for the timing of the signal edge, which is usually recorded in a [[Probability density function|PDF]].

DDJ's [[Probability density function|PDF]] is always a series of [[Pulse (signal processing)|pulses]] at the locations where a specific bit pattern experiences a [[Crossover distortion|cross over]]. Therefore, in order to get an accurate measure of the DDJ in a particular system, a large number of bit patterns must be analyzed (often just a [[PRBS]]) unless an [[analytical solution]] can be found.

==See alsoReferences==

{{Reflist}}

* [[Jitter]]

{{DEFAULTSORT:Data-Dependent Jitter}}

[[Category:Electronics terms]]

[[Category:Data transmission]]

[[Category:Packets (information technology)]]