Keysight Technologies E5052A/B Signal Source Analyzer with E5001A SSA-J Software Provides Precision Clock Jitter Analysis with Femto-second Resolution

Technical Overview

Introduction

In order to meet the demanding needs for more precise and accurate characterization and evaluation of clock-signal jitter in advanced digital communication systems today, Keysight Technologies, Inc. offers a new tool that delivers remarkable, ultra-low jitter measurement capabilities on both random jitter (RJ) and periodic jitter (PJ).

The E5001A SSA-J Precision Clock Jitter Analysis software along with the E5052A/B Signal Source Analyzer enhances your ability to separate RJ and PJ from total jitter (TJ) by combining time-domain waveform measurement techniques and frequency-domain phase-noise measurement techniques.

Ultra-low RJ measurement with femto-second resolutionE5052A/B jitter-measurement resolution and noise floor are exceptionally low, typically on the order of a few femto-seconds of random jitter noise-floor at a 10 Gb/s rate. The typical high-performance (real-time or sampling) oscilloscope has a jitter noise-floor above one hundred femto-seconds due to the limited dynamic-range of the ADC and relatively large residual jitter of its internal reference time base. The E5052A/B has a very quiet internal time base and maintains wide dynamic range by detecting phase noise at baseband where a large carrier signal is canceled out. Besides the very quiet internal time base, the E5052A/B can extend the jitter measurement limit even below the residual jitter of its internal time base by using a unique cross-correlation technique between two independent internal measurement channels. Using this cross-correlation technique, the E5052A/B achieves the highest performance of any signal source analyzer. It may have 100 times to 1,000 times lower jitter noise floor when compared to an oscilloscope. Using a heterodyne digital discriminator method, the jitter measurement is available in the new SSA E5052B when the RJ is dozens of UI.

Random jitter[UI @ 2 GHz]10 µ 100 µ 1 m 10 m 100 m 1 10 100

Oscilloscopes

E5052B SSA

E5052A SSA

Figure 1. SSA versus oscilloscope

03 | Keysight | E5052A/B Signal Source Analyzer with E5001A SSA-J Software Provides Precision Clock Jitter Analysis with Femto-second Resolution - Technical Overview

Figure 2. RJ spectrum view

Real-time jitter spectrum analysis on both RJ and PJThe jitter frequency analysis range is from 1 Hz to 100 MHz (Note1). The E5001A’s PJ extracting function can identify periodic jitter frequency components out of random jitter components within the user-definable boundary. It is very fast and easy to change integration boundaries of analysis frequency range in order to get total jitter in a specific bandwidth. Unlike the traditional jitter measurement paradigm, the E5052A/B and the E5001A software offer speedy and easy real-time jitter spectrum measurements for both RJ and PJ so that the user can save evaluation time and gain more insight into new investigations. Periodic jitter components are displayed in the PJ Spectrum view. The periodic jitter frequencies help you to understand clock signal quality and contamination sources of signal integrity.

Note 1: In the E5052B, the jitter frequency analysis range is up to 100 MHz with a PLL method and it is up to 40 MHz with a heterodyne digital discriminator method. In the E5052A, the jitter frequency analysis range is from 1 Hz to 40 MHz.

Figure 3. PJ spectrum view

04 | Keysight | E5052A/B Signal Source Analyzer with E5001A SSA-J Software Provides Precision Clock Jitter Analysis with Femto-second Resolution - Technical Overview

The E5001A works not only in frequency domain but also in time domainThe E5001A determines precise RJ and PJ separation through the use of an algorithm based on power integration. You get clear and detailed information about jitter charac-teristics of the clock signal, such as jitter trend, jitter histogram, RJrms, PJrms, TJp-p, PJp-p, PJδ-δ, so that you can estimate the system’s data independent bit error rate (BER) during a specific period of time.

Figure 4. Jitter trend view

Consider taking advantage of the E5001A SSA-J software with your E5052A/B if you want to:

– make accurate characterization or evaluation of your data independent clock jitter below a few pico-seconds

– identify periodic noise sources (that may cause clock jitter) through PJ extraction – separate RJ from the total jitter you are observing, and estimate system

performance in BER – have clearer design insight into signal integrity by combining both analysis methods

in time domain and frequency domain – observe an exceptionally low jitter world that has never been seen by usual high-

performance oscilloscopes

05 | Keysight | E5052A/B Signal Source Analyzer with E5001A SSA-J Software Provides Precision Clock Jitter Analysis with Femto-second Resolution - Technical Overview

Figure 5. PJ separation view. Histogram 200 counts

Ordering informationE5001A SSA-J Precision Clock Jitter Analysis softwareNote: The E5001A software works with the E5052A/B firmware Rev. 2.50 or later. To update your E5052A/B firmware, access www.keysight.com/find/ssa and follow the instructions to download the latest firmware version.

06 | Keysight | E5052A/B Signal Source Analyzer with E5001A SSA-J Software Provides Precision Clock Jitter Analysis with Femto-second Resolution - Technical Overview

This information is subject to change without notice.© Keysight Technologies, 2017Published in USA, December 1, 20175989-5040ENwww.keysight.com

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