Period jitter tends to be important in synchronous circuitry such as digital state machines where the error-free operation of the circuitry is limited by the shortest possible clock period (average period less maximum cycle jitter), and the performance of the circuitry is set by the average clock period. cycle jitter) The difference between any one clock period and the ideal or average clock period. Maximum time interval error (MTIE) Maximum error committed by a clock under test in measuring a time interval for a given period of time. The amount of tolerable jitter depends on the affected application.įor clock jitter, there are three commonly used metrics:Ībsolute jitter The absolute difference in the position of a clock's edge from where it would ideally be. Jitter can cause a display monitor to flicker, affect the performance of processors in personal computers, introduce clicks or other undesired effects in audio signals, and cause loss of transmitted data between network devices. Jitter may be caused by electromagnetic interference and crosstalk with carriers of other signals. ITU-T G.810 classifies deviation lower frequencies below 10 Hz as wander and higher frequencies at or above 10 Hz as jitter. Jitter frequency, the more commonly quoted figure, is its inverse. Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal characteristic that varies regularly with time.

Also, like other time-varying signals, jitter can be expressed in terms of spectral density. Jitter can be quantified in the same terms as all time-varying signals, e.g., root mean square (RMS), or peak-to-peak displacement. Jitter is a significant, and usually undesired, factor in the design of almost all communications links. In clock recovery applications it is called timing jitter.

In electronics and telecommunications, jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal. JSTOR ( March 2009) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

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