Keysight E2681A Ezjit plus jitter analysis software Datasheet

Keysight Technologies
EZJIT Plus Jitter Analysis Software
for Infiniium Oscilloscopes
Data Sheet
02 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
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-bystep 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.
Figure 1. The ISI filter makes it possible to determine DCD in arbitrary patterns.
03 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
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
Occasionally, common spectral algorithms for RJ extraction overreports RJ. The problem
is that bounded uncorrelated jitter looks like RJ to a spectral jitter separation method.
Figure 2. The EZJIT Plus wizard makes separating jitter easy.
04 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
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.
Figure 3. Jitter separation with artificially extreme crosstalk using spectral algorithm for RJ extraction.
Notice the discontinuity in the BER bathtub, indicating that the extraction is getting poor convergence.
Figure 4. Jitter separation with the same artificially extreme crosstalk shown in Figure 3 using tail fit
algorithm for RJ extraction. Notice the good fit to the BER bathtub and dramatically lower RJ and TJ results.
05 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Analysis charts for separating jitter
EZJIT Plus provides numerous charts to determine the correct settings in your jitter
separation. While the wizard provides a quick way to separate jitter, there are times when
parameters need to be changed to make the correct answer. The EZJIT Plus analysis
charts provide detailed information needed to properly separate the jitter of your design.
EZJIT Plus includes the following jitter charts to help you in your analysis:
– Composite jitter histogram
– Jitter BER bathtub
– TJ histogram
– RJ/PJ threshold
– PJ threshold
– DDJ vs. bit
– ISI filter
– Tailfit versus spectral bathtub
– RJ/PJ spectrum
– DDJ histogram
Figure 5. View up to nine analysis charts at once, undock them and move the charts to a different display
06 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Figure 6. Composite histogram displays relative contributions of DDJ, TJ as well as RJ and PJ jitter.
Figure 7. The RJ/PJ threshold allows you to see the exact threshold the software is using to determine
RJ/PJ components.
Analysis tools for properly separating jitter
A simplified display leverages existing measurement results tabs and measurement
toolbars, integrating the EZJIT Plus measurement capability into the Infiniium display
window. The EZJIT Plus menu allows you to separate TIE, period, and nUI jitter into RJ/
DJ components. The tools provide both periodic and arbitrary waveform analysis.
In the EZJIT Plus tab, you can easily filter the jitter (low pass, high pass, bandpass),
change between BER and Q-Scale and remove or specify the Rj component of the jitter
(another analysis tool for difficult jitter problems such as crosstalk).
Ultimately all these tools and charts means that Keysight’s EZJIT Plus software will provide
you the analysis to make the most accurate jitter measurement of any tool in the market.
07 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
EZJIT: Essential Jitter Analysis Tools
Included with EZJIT Plus
Jitter analysis made easy
A wizard in the EZJIT jitter analysis software helps you quickly set up the Infiniium
oscilloscopes and begin taking measurements. With time-correlated jitter trend and
signal waveform displays, the relationships between jitter and signal conditions are
more clearly visible. Intuitive displays and clear labeling of information make it easy to
comprehend measurement results.
Figure 9. The setup wizard prompts you to select measurement thresholds, histogram, jitter trend, and/or
spectrum displays.
Figure 10. The EZJIT wizard simplifies jitter measurement setup, making it easy to view difficult
measurements like SSC.
Figure 8. EZJIT’s step-by-step wizard makes
setting up jitter measurements quick and
accurate.
08 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Extensive parametric analysis
EZJIT jitter analysis software can analyze the time variability of any of the following
fundamental parametric measurements:
Single-source
– Period
– Frequency
– Positive pulse width
– Negative pulse width
– Duty cycle
– Rise time
– Fall time
Dual-source
– Setup time
– Hold time
– Phase
Clock
– Time-interval error (TIE)
– N - period jitter
– Period-to-period jitter
– Pos width to pos width jitter
– Neg width to neg width jitter
– Cycle-to-cycle duty cycle
Data
– Time interval error (TIE)
– Data rate
– Unit interval
– n - UI jitter
– UI - UI jitter
– Clock recovery rate
Figure 11. Extensive parametric analysis provides insight into data jitter
components.
Figure 12. Clock jitter measurements provides insight into clock jitter
components.
09 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Real-time trend, histogram, and spectrum displays
Measurement data can be viewed as a trend display (Figure 13), showing a time plot
of the measurement timecorrelated with the signal waveform data. This makes it easy
to understand relationships between jitter and signal conditions, such as intersymbol
interference (ISI). EZJIT provides up to 17 measurement trends to be analyzed at once.
The histogram display (Figure 14) plots the relative occurrence of values for the
measured parameter. The histogram provides insight into the statistical nature of the jitter.
For example, the histogram shown in Figure 14 appears as two gaussian distributions.
The peak-to-peak jitter between the gaussians indicates significant deterministic jitter in
the signal, while the gaussians show the spread of random jitter.
The spectrum display (Figure 15) shows the spectral content of the jitter. The spectrum
display can be useful for identifying sources of jitter by their frequency components. For
example, if you suspect a switching power supply with a switching frequency of 33‑KHz
is injecting jitter, you can test your theory by examining the jitter spectrum for a peak at
33‑KHz.
Figure 13. A trend display, showing a time plot of the measurement
timecorrelated with the signal waveform data, makes it easy to understand
relationships between jitter and signal conditions.
Figure 15. A spectrum display shows the spectral content of the jitter, useful for
identifying sources of jitter by their frequency components.
Figure 14. A histogram display plots the relative occurrence of values for the
measured parameter, providing insight into the statistical nature of the jitter.
10 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Deep memory captures low-frequency jitter
Deep memory is especially valuable for jitter analysis. The optional 2 Gpts memory on
the Keysight 90000 X-Series and 90000 Q-Series is helpful in measuring low frequency
jitter. At a sample rate of 80 GSa/s and incoming data rate of 2.5 Gb/s, 2 Gpts allows
you to capture jitter frequency components down to 40Hz. Comparably in the 90000A,
9000A, and 9000 H-Series, the 40 GSa/s sample rate and optional 1 Gpts memory
allows you to capture jitter frequency components as low as 40 Hz.
In some cases, measuring low-frequency jitter is not required; for example, the clock
recovery PLL in most serial data receivers can reject jitter very effectively at moderately
low frequencies. But sometimes an event occurring at a low repetition rate can cause
bursts of jitter or noise with higher frequencies that the PLL cannot reject.
For even deeper insight, apply the same deep analysis and component separation to the
vertical noise affecting your signal using Keysight’s N8813A EZJIT Complete software.
Figure 16. Use the measurement trend to remove spread spectrum clocks from your signal and make
measurements on it.
11 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Ordering information
To order the EZJIT jitter analysis software with an oscilloscope, please order the option indicated in the table:
License type
Fixed
Floating
Infiniium Offline
Infiniium
Z-Series
Infiniium
S-Series
Infiniium 90000A and
X Series
Infiniium
9000 Series
Factory-installed
N5400A-1FP
N5400B-1FP
Option 004
Option 004
User-installed
N5400A-1FP
N5400B-1FP
N5400A-1NL
N5400B-1NL
Transportable
N5400A-1TP
N5400B-1TP
N5400A-1TP
N5400B-1TP
Server-based
N5435A-001
DSA package
Part of the N8900A-002 DSA package
To order the EZJIT jitter analysis software for an existing oscilloscope, please order the following:
Model number
Description
E2681A
After-purchase EZJIT jitter analysis software for Infiniium oscilloscopes
N5400A
After-purchase EZJIT Plus jitter analysis software for Infiniium oscilloscopes
N5401A
After-purchase EZJIT Plus upgrade from existing EZJIT installation for oscilloscopes
N8813A
After-purchase EZJIT Complete upgrade from existing EZJIT Plus installation for oscilloscopes
12 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Other Measurement Software for High Speed Digital Data Analysis
Model Number
Title
Description
Realtime Oscilloscopes: DSO/DSA90000A Series, 90000X Series, 90000Q Series
E2681A
EZJIT
Trending of Measurements, clock recovery, and fundamental jitter measurements such as total jitter and
N cycle jitter.
N5400A
EZJIT Plus
Jitter Decomposition using dual dirac technique. Predict total jitter to low BERs
N5461A
Equalization
Select from CTLE, FFE and DFE equalization types and various clock topologies to understand what
equalization will do to a signal, or to model voltage eye internal to receiver device.
N2809A &
N2807A
Precision Probe Software
and Hardware Kit
Measure and remove effects of cable and switch paths in front of the oscilloscope, measure and ac calibrate probes for greatest accuracy and bandwidth.
N5465A
InfiniiSim Waveform
Transformation Toolset
Creates transfer functions for implementing De-Embedding of Fixtures and cables, Embedding, general
simulation, removing probe loading and changing observation point of measurement.
E2688A
Serial Data Analysis
Create eye diagrams of total captured waveform or of particular filtered portions of it (i.e bit sequence
dependence). Includes standard masks and 8b/10b protocol analysis.
Sampling Oscilloscopes: 86100D Series Digital Communication Analyzer
86100D-300
Advanced Amplitude Analysis
Infiniium DCA software option that performs the highest accuracy amplitude analysis available.
86100D-200
Advanced Jitter Analysis
Jitter Decomposition using dual dirac technique. Predict total jitter to low BERs
86100D-201
Advanced Jitter Analysis
Equalize signals using software CTLE and FFE/LFE models.
86100D-202
Enhanced Impedance and
S-Parameter SW
Single-ended and differential S-parameter measurements.
86100D-300
Advanced Amplitude Analysis
Infiniium DCA software option that performs the highest accuracy amplitude analysis available.
86100DU-401
Advanced Eye Analysis
Jitter and amplitude/noise analysis on long patterns such as PRBS31. Eye contour and eye/mask testing.
86100D-SIM
InfiniiSim-DCA
Creates transfer functions used to de-embed/embed fixtures and cables, general simulation, removing
probe loading and changing observation point of measurement.
Related Literature
Publication title
Publication type
Publication number
Infiniium DSO90000 and DSA90000 Series Oscilloscopes
Data Sheet
5989-7819EN
Infiniium 90000 X Series Oscilloscopes
Data Sheet
5990-5271EN
Infiniium 90000 Q Series Oscilloscopes
Data Sheet
5990-5299EN
Infiniium S-Series Oscilloscopes
Data Sheet
5991-3904EN
Infiniium Z-Series Oscilloscopes
Data Sheet
5991-3868EN
EZJIT Plus
Data Sheet
5990-6541EN
EZJIT Complete
Data Sheet
5991-0523EN
EZJIT
Data Sheet
5989-5483EN
Information on Jitter Measurement
White Paper
5989-5483EN
86100D Wide-Bandwidth Oscilloscop Mainframe and Modules
Data Sheet
5990-5822EN
86100C Jitter/Amplitude
Product Note
5989-1146EN
For copies of this literature, contact your Keysight representative or visit www.keysight.com/find/scope-apps.
13 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Choosing your Jitter Analysis Software for Infiniium Oscilloscopes
Model number
Option number
Advanced Clock Recovery
EZJIT
EZJIT Plus
EZJIT Complete
E2681A
002
N5400A
004
N8813A
057
Requires Serial Data Analysis,
option -003
Requires Serial Data Analysis,
option -003
Requires Serial Data Analysis,
option -003
Basic Jitter Views
Jitter trend
Y
Y
Y
Jitter histogram
Y
Y
Y
Jitter spectrum
Y
Y
Y
Multi-acquisition
Y
Y
Y
Jitter Clock Measurements
Period
Y
Y
Y
Pulse width (+, –, both)
Y
Y
Y
Frequency
Y
Y
Y
Duty cycle (+, –)
Y
Y
Y
Time-interval error
Y
Y
Y
Cycle-cycle jitter
Y
Y
Y
N-cycle jitter
Y
Y
Y
Cycle-cycle +/– width
Y
Y
Y
Cycle-cycle duty cycle
Y
Y
Y
Time-interval error
Y
Y
Y
Data rate
Y
Y
Y
Unit interval
Y
Y
Y
Jitter Data Measurements
Delay/Edge Measurements
Setup/hold
Y
Y
Y
Phase
Y
Y
Y
Rise/fall time
Y
Y
Y
Random jitter (RJ)
Y
Y
Deterministic jitter (DJ)
Y
Y
Data dependent jitter (DDJ)
Y
Y
Inter-symbol interference (ISI)
Y
Y
Duty cycle distortion (DCD)
Y
Y
Bounded uncorrelated jitter (BUJ)
Y
Y
Periodic jitter (PJ)
Y
Y
Aperiodic bounded uncorrelated jitter (ABUJ)
Y
Y
Total jitter (TJ) estimation
Y
Y
BER range
Y
Y
Max pattern length periodic mode
Y
Y
Max pattern length arbitrary mode
Y
Y
Jitter Separation
14 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Choosing your Jitter Analysis Software for Infiniium Oscilloscopes (Continued)
EZJIT
EZJIT Plus
EZJIT Complete
Model number
Option number
E2681A
002
N5400A
004
N8813A
057
Real-time Eye
Requires Serial Data Analysis,
option -003
Requires Serial Data Analysis,
option -003
Requires Serial Data Analysis,
option -003
Advanced Jitter Views
BER bathtub
Y
Y
DDJ vs bit
Y
Y
Composite histograms
Y
Y
TJ histogram
Y
Y
DDJ histogram
Y
Y
RJ/PJ histogram
Y
Y
RJ/PJ spectrum
Y
Y
Vertical Noise Analysis
Vertical noise decomposition
Y
Total interference estimation
Y
Separate analysis of one and zero levels
Y
Advanced noise views
Y
Keysight Oscilloscopes
Multiple form factors from 20 MHz to > 90 GHz | Industry leading specs | Powerful applications
15 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
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© Keysight Technologies, 2012 - 2014
Published in USA, August 2, 2014
5989-0109EN
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