Jitter

From ArticleWorld


Jitters have been in existence in digital instruments since the very beginning and though abundant initially, have been reduced in intensity and variability considerably since then. Through the study and consequently redevelopment of more effective circuitry, the problems of jitters in instruments have been minimized and in some cases, eliminated. As a result of this, instruments have evolved into instruments that utilize power more efficiently.

What types of jitters are there?

Jitters can either be classified as qualitative or quantitative. This classification is broadly classified as per the signals it emits while under study.

Qualitative jitters are various, such as the amplitude of the signal, pulse width in comparison to individual signals or pulse position as the case may be when the signal is not synchronized with the standard pulse. This form is related to the synchronization and cyclic disturbances.

Examples of quantitative jitters can be said to occur when there is a characteristic seen in the variation of the mean, RMS or the difference in the peak-to-peak displacement. This form is related to the intensity of the jitter.

Jitters in Clocks

Clocks experience two very common forms of jitters, namely phase and period jitters. The phase jitters consists of the variation in the peak-to-peak difference, which is quantified as the difference between the maximum and minimum phase of the clock over the entire cycle as well as the standard deviation of the peak-to-peak difference.

Period jitters on the other hand, is the difference observed from one period to the next, with respect to the entire spectrum of all the periods in operation.

The need to study jitters

The study and rectification of jitters allows for the improvement of digital signals in various products that have come to be a common feature in the execution of tasks on a day-to-day basis. These include digital to analog converters, as seen in audio systems, video displays, etc., IP networks (where jitters are seen as the tendency for data packets to display a delay in the transmissions of data packets), etc. Once diagnosed and rectified, the products thus developed will be able to nullify these discrepancies and hence prolong the life and economy of such products.