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EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes

Data Sheets

With the faster edge speeds and shrinking data valid windows in today’s high-speed digital designs, insight into the causes of signal jitter is critical for ensuring the reliability of your design. Keysight Technologies, Inc.EZJIT Plus jitter analysis software for Infiniium oscilloscopes provides the advanced decomposition, analysis, and views of jitter necessary for fast and accurate insight into your signal. Decompose jitter into components, view BER bathtub curves and estimate TJ at low BER. Whether your signal is subject to channel ISI, power supply interference, or crosstalk from adjacent signal paths, EZJIT Plus enables you to accurately estimate TJ and determine the sources of jitter affecting your signal.

Easy to Use Rj/Dj Separation Wizard

Your jitter separation experience begins with the EZJIT Plus Rj/DJ jitter separation wizard. The easy-to-use wizard makes setting up jitter separation fast and easy. Walk through the step-by step wizard to set critical parameters such as thresholds, vertical scaling, clock recovery, noise removal, and clock recovery. When you are finished with the wizard, you get fast and accurate separation of jitter.

Separate Jitter on Both Periodic and Non-Periodic (Arbitrary) Waveforms

One of the advantages of a real time oscilloscope over other jitter analysis engines is the ability to separate jitter on arbitrary patterns, including long periodic patterns such as PRBS23 and PRBS31.Typically, jitter separation is performed on repetitive waveforms that are designed to stress the data transmission link and receivers clock recovery circuitry. However, many embedded designs using multi-vendor chipsets are limited to testing live traffic with additional align characters and packet frames that may not be repetitive. EZJIT Plus allows designers to choose between periodic and arbitrary data modes when analyzing jitter for compliance. In the arbitrary data mode, the ISI filter shows victim-aggressor relationships between each rising and falling edge that are N-edges apart in the captured waveform. By setting the filter wide enough to capture all significant relationships, designers can quickly analyze ISI problems and accurately separate RJ/DJ parameters to provide a TJ estimation at low BER.

Easy-to-use jitter separation wizard The easy-to-use wizard built into EZJIT Plus makes setting up advanced jitter separation simple. Walk through the measurement setup step-by-step to set critical parameters such as thresholds, vertical scaling, and clock recovery. The result: fast and accurate separation of signal jitter into components and flexible jitter views to provide critical insight.

Accurate Random Jitter Separation using Spectral and Tail Fit Algorithms (Continued)

Ultimately, this means two problems occur. First, the RJ measurement can be inaccurate. Second, when measuring Total Jitter (TJ) vs. BER, TJ can be dramatically overestimated due to the RJ multiplier. For example, TJ = DJ + 14*RJ for a BER of 10^-12.This means the scope will provide an unfairly negative report of the overall jitter performance of your serial data link, even tough the real RJ is dramatically less.

To solve the BUJ problem, EZJIT Plus provides two distinct algorithms for RJ extraction to ensure you achieve accurate measurements under all signal conditions.

The Tail Fit algorithm accurately extracts RJ, even in extreme ABUJ/crosstalk environments, by fitting directly to the tail of the RJ,PJ histogram.

Figures 3 and 4 contrast the two algorithms in a contrived jitter measurement with extreme crosstalk. The tail fit algorithm in Figure 4 provides a much better fit to the BER bathtub curve in the lower left and reports significantly lower RJ and TJ.

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