Selecting Random Jitter (RJ) Bandwidth in EZJIT Plus Software
应用文章
Separating jitter into its random and deterministic components (called “RJ/ DJ separation”) is a relatively new technique for analyzing a signal’s aggregate total jitter. The primary purpose of this task is to estimate peak-to-peak jitter values at very low bit error rate levels that would otherwise take too much time to measure directly. An added benefit of this technique is that it gives you a basic understanding of the jitter’s underlying cause.
EZJIT Plus is an optional jitter analysis package that runs on Infiniium real-time oscilloscopes from Keysight Technologies, Inc. and performs RJ/DJ analysis. EZJIT Plus software uses different analysis techniques depending on whether you specify that the data pattern is periodic or non-periodic. Further, the RJ bandwidth modifies parameters for these techniques, and these modifications can yield different results depending on the nature of the signal being applied. The pattern length selection (periodic/arbitrary) allows for analysis of data patterns that are periodic, or for data patterns that are either not periodic, or their pattern length is too long to be analyzed using the periodic data mode. (See Figure 1.) The RJ bandwidth selection (wide/narrow) enables you to tailor the analysis based on your knowledge of the noise model of the signal. This document provides a detailed explanation of the RJ bandwidth control and helps you determine how to set it.