AN3631| Application Note
Maxim/Dallas > App Notes > WIRELESS, RF, AND CABLE Keywords: random noise, jitter, timing jitter, rms noise, phase noise, rms phase noise
Sep 02, 2005
APPLICATION NOTE 3631
Random Noise Contribution to Timing Jitter--Theory and Practice
Numerous factors affect random timing jitter, including noise sources such as phase noise, broadband noise, and spurs, as well as slew rate and bandwidth. This article explores these sources, and also provides equations to translate noise into timing jitter.
Introduction
Timing jitter and noise are among the least understood engineering concepts, yet they are among the most critical parameters in analog and digital designs. Especially true in high-speed communication systems, poor jitter performance can cause increased bit-error rates and limit system speed. Timing jitter is generally defined as the short-term variation of a significant instant of a digital signal from its ideal position in time. There are a number of factors that contribute to random timing jitter, including broadband noise, phase noise, spurs, slew rate, and bandwidth. Both phase and broadband noise are random, whereas spurs are deterministic responses caused by various identifiable interference signals, such as crosstalk and power supply coupling. As shown later in this article, slew rate and bandwidth also affect jitter. Figure 1 illustrates a nonideal sinusoid that contains the three noise sources. Figure 2 shows a digital signal with jitter that accumulates over time. The purpose of this article is to
both explain and demonstrate the direct relationship between timing jitter and these three noise sources.
Figure 1. The three noise sources shown here are contributors to timing jitter.
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