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This opens the main configuration screen, which operates as a flow chart. See Figure 1. The importance of this fact cannot be understated! The dual-Dirac jitter model describes jitter as having a dual-Dirac shape, with two Gaussian functions that grow with the bit error ratio.

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This opens the main configuration screen, which operates as a flow chart. See Figure 1. The importance of this fact cannot be understated! The dual-Dirac jitter model describes jitter as having a dual-Dirac shape, with two Gaussian functions that grow with the bit error ratio.

See Figure 2 and the suggested readings for additional details. Since it is virtually impossible to acquire enough events to directly measure total jitter at extremely small bit error ratios such as the commonly used value of , a model must be employed to extrapolate beyond the measurements actually taken.

A variety of methods for estimating jitter have been developed and refined over the years, and the methods employed by the SDA II package are the sum of nearly a decade of effort to devise the best algorithms possible. The first step in the analysis flow is to calculate data-dependent jitter DDj.

With DDj removed, these traces are much more amenable to jitter analysis. Figure 3 shows the effect of removing DDj from the jitter Spectrum.

The peak can be seen easily in the first division. These peaks are removed, and the remaining spectrum is associated with random jitter. This corresponds to the sigma value for the dual-Dirac Gaussian.

Note: this algorithm is used beginning with firmware version 6. Rj and Dj values are determined using the fitting method previously described in the "Dual Dirac Spectral Method" section. The results are posted to the Jitter Measurements table using the notation Tj 1e , Dj sp and Rj sp. The "1e" indicates that the user selected the BER level of for the analysis ". The mean positions of the Gaussians are also determined as in the Dual-Dirac Spectral method.

The results are posted to the Jitter Measurements table using the notation Tj 1e , Dj nq and Rj nq. The NQ-Scale will typically converge on a more accurate result given its greater flexibility. More statistics are also required with NQ-Scale in order to return a stable result. The Dual-Dirac Spectral method is known to return incorrect results when there is wide-band bounded uncorrelated jitter BUj.

In other words, deterministic jitter with energy that is spread across a wide frequency band such that it cannot be detected as a peak in the RjBUjSpect trace will be incorrectly interpreted as Rj. Examples include crosstalk from neighboring data channels and non-stationary periodic jitter sources like spreadspectrum clocks.

The Dual-Dirac Spectral method also is hindered by its assumption that both Gaussians have the same underlying sigma and population. Nonetheless, the Dual-Dirac Spectral method is fast and returns correct results in the majority of cases. In general when the results for the models are markedly different, using NQ-Scale is highly recommended.

It is important to keep in mind that both methods return estimates of the total, random and deterministic jitter since the algorithms are model-based and are not a simple calculation based on the measured data. Additional Reading.

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LAB_WM452 - Understanding the choices for jitter calculation method

If you are using a screen reader, or having trouble reading this website, please call 40 Customer Support for help at The oscilloscope displays the result of the Q-scale analysis; these are also shown in figure 1. Rj is determined by averaging the sigma values that were determined from the normalized Q-scale analysis, one for each of the two Gaussian distributions. Note that there is no singular method of calculating Tj, Rj and Dj, and no shortage of literature on the topic of calculating jitter. After a method is selected, the scope calculates the jitter using all data accumulated, and places the results in the Measure Table. Summary The LeCroy Serial Data Analyzers give users a choice of three different methods for calculating the jitter in their signals. These are the sloped red lines. This LeCroy algorithm determines the periodic jitter, duty cycle distortion and data-dependent jitter.

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Understanding SDA II Jitter Calculation Methods

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Analyze the data in this tab for evidence of periodic aggressors in your system that will cause edges to shift in a periodic fashion. Surah V. The Conventional method gives additional insight into sources of periodic and data dependent jitter. Rj is determined by averaging the sigma values that were determined from the normalized Q-scale analysis, one for each of the two Gaussian distributions. This application brief describes the methodology used to determine the jitter components for each method, and when each method should be used.

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In the event of a dispute involving sample integrity when sampling for testing against Specification D requirements, Practice D shall be used as astm d x sampling procedure. D ; the number immediately. Open the needle valves at both ends of the cylinder. Not Logged In Member? Just give us the opportunity to resolve a problem. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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