Editing Jitter (section)

==Types==
One of the main differences between random and deterministic jitter is that deterministic jitter is bounded and random jitter is unbounded.<ref>{{cite web |first1=Julian |last1=Hagedorn |first2=Falk |last2=Alicke |first3=Ankur |last3=Verma |title=How to Measure Total Jitter |url=http://www.ti.com/lit/an/scaa120b/scaa120b.pdf |id=SCAA120B |date=August 2017 |publisher=[[Texas Instruments]] |access-date=2018-07-17}}</ref><ref>{{cite web|title=Understanding Jitter Calculations |url=http://teledynelecroy.com/doc/understanding-dj-ddj-pj-jitter-calculations |date=July 9, 2014 |publisher=[[Teledyne Technologies]] |access-date=2018-07-17}}</ref>

===Random jitter===
Random jitter, also called Gaussian jitter, is unpredictable electronic timing noise. Random jitter typically follows a [[normal distribution]]<ref>{{cite web |first1=Julian |last1=Hagedorn |first2=Falk |last2=Alicke |first3=Ankur |last3=Verma |title=How to Measure Total Jitter |url=http://www.ti.com/lit/an/scaa120b/scaa120b.pdf |id=SCAA120B |date=August 2017 |publisher=[[Texas Instruments]] |access-date=2018-07-17}}</ref><ref>{{cite web|title=Understanding Jitter Calculations |url=http://teledynelecroy.com/doc/understanding-dj-ddj-pj-jitter-calculations |date=July 9, 2014 |publisher=[[Teledyne Technologies]] |access-date=2018-07-17}}</ref> due to being caused by [[thermal noise]] in an [[electrical circuit]].

===Deterministic jitter===
'''Deterministic jitter''' is a type of clock or data signal jitter that is predictable and reproducible. The peak-to-peak value of this jitter is bounded, and the bounds can easily be observed and predicted. Deterministic jitter has a known non-normal distribution. Deterministic jitter can either be correlated to the data stream ([[data-dependent jitter]]) or uncorrelated to the data stream (bounded uncorrelated jitter). Examples of data-dependent jitter are duty-cycle dependent jitter (also known as duty-cycle distortion) and [[intersymbol interference]].

===Total jitter===
{| class="wikitable" align="right" style="margin-left:10px"
|-
! n
! BER
|-
| 6.4
| 10<sup>−10</sup>
|-
| 6.7
| 10<sup>−11</sup>
|-
| 7
| 10<sup>−12</sup>
|-
| 7.3
| 10<sup>−13</sup>
|-
| 7.6
| 10<sup>−14</sup>
|}

Total jitter (''T'') is the combination of random jitter (''R'') and deterministic jitter (''D'') and is computed in the context to a required [[bit error rate]] (BER) for the system:<ref>{{cite web |title=The Meaning of Total Jitter |first=Ransom |last=Stephens |url=http://www.ransomsnotes.com/index_htm_files/RansomStephensJitter360Pt1TheMeaningOfTotalJitter.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://www.ransomsnotes.com/index_htm_files/RansomStephensJitter360Pt1TheMeaningOfTotalJitter.pdf |archive-date=2022-10-09 |url-status=live |publisher=[[Tektronix]] |access-date=2018-07-17}}</ref>

:{{math|1=''T'' = ''D''<sub>peak-to-peak</sub> + 2''nR''<sub>rms</sub>}},

in which the value of ''n'' is based on the BER required of the link.

A common BER used in communication standards such as [[Ethernet]] is 10<sup>−12</sup>.