Keysight Technologies Inc. 86108B-JSA Jitter Spectrum Analysis And Clock Recovery Emulation

Improve jitter measurement accuracy

• Optimize the accuracy of random jitter measurements performed by 86100C/D-200 Jitter Mode
• Emulate an ideal software clock recovery (CR) response; implement Golden PLL per standards
• Compensate for non-ideal hardware CR response
• Analyze what-if scenarios using a wide variety of CR responses

Improve insight into jitter and isolate jitter issues more quickly

• Analyze the jitter spectrum of clock and data signals using jitter magnitude vs. frequency graphs
• View the spectral distribution of low-frequency jitter and isolate jitter components
• Perform band limited (integrated) TJ/DJ/RJ measurements; user-specified start/stop frequencies
• Measure the frequency and magnitude of individual spectral peaks

Simplify clock recovery setup

• Simple setup of loop order, bandwidth, peaking, and damping factor
• Graphical representation of Jitter Transfer Function (JTF) and Observed JTF (OJTF)
• Automatic conversion of PLL parameters between JTF and OJTF
• Emulate 1st, 2nd, and 3rd order PLL loop responses, CR loop bandwidths to 30 MHz

86108B-JSA Jitter Spectrum Analysis (JSA) and Software Clock Recovery Emulation (CRE) is a feature that optimizes Jitter Mode accuracy and also helps designers isolate jitter issues more quickly.

86108B-JSA leverages a real-time acquisition system built into the 86108B Precision Waveform Analyzer module and performs jitter spectrum measurements on data and clock signals (to 32 Gb/s or 16 GHz). Jitter spectrum measurements allow designers to see the spectral distribution of low-frequency jitter and isolate root cause of jitter sources more quickly.

Figure 1: Jitter Spectrum Analysis (JSA) allows designers to view the spectral distribution of low-frequency jitter and isolate jitter components.

JSA features, enabled through the FlexDCA user interface, also allow users to specify an ideal software clock recovery model. These models can be used in conjunction with the jitter spectrum graphs and jitter mode measurements. Golden PLL responses may be defined using 1st, 2nd, or 3rd order PLL, adjustable loop BW (to 30 MHz) and user-specified peaking/damping factors. Users can also specify their software CR models using Jitter Transfer Function (JTF, or low-pass function) or Observed Jitter Transfer Function (OJTF, the high-pass function) definitions, making it easier to ensure compliant measurements.

Figure 2: Clock Recovery Emulation (CRE) makes it easy for users to define software clock recovery models using loop order, bandwidth, peaking, and damping factor.