N1076A Datasheet, PDF (8/19 Pages) Keysight Technologies – Electrical and Optical Clock Data Recovery Solutions

08 | Keysight | Electrical and Optical Clock Data Recovery Solutions - Data Sheet
Characterize Next-generation Receivers and Transmitters (Continued)
Recover clocks or clean-up clocks
The N1076A/77A provides clock signals for BERTs or oscilloscopes when access to appropriate
clock signals from the DUT is not possible. It can also act as a clean-up PLL for existing clocks
with excessive intrinsic jitter to allow accurate measurements.
Measure the real performance of clock-less devices
Accurate transmitter measurements are possible because of low intrinsic jitter, paired with
tunable loop bandwidth, selectable peaking, and good sensitivity. The N1076A/77A’s auxiliary
clock output provides ultra-low intrinsic random jitter of less than 100 fs RMS, making it the
ideal companion for sampling scopes equipped with a precision time base.
Perform more accurate jitter measurements and gain greater insight into
the root cause(s) of jitter
Jitter spectrum analysis (Option JSA) integrates a step generator and a low-noise, 14-bit
ADC into the clock recovery design (see Figures 4, 6, and 8). The step generator and ADC
characterize the clock recovery PLL in real-time, providing FlexDCA with the information that is
necessary to calculate jitter at the input to the instrument. JSA uses this information to:
–– Optimize the accuracy of random jitter measurements performed by 86100D-200 Jitter
mode
–– Emulate an “ideal” software clock recovery (CR) response; implement Golden PLL per
standards
–– 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
Figure 11. Jitter spectrum analysis (N107xA Option JSA) optimizes Jitter Mode (86100D Option 200)
accuracy, measures low-frequency jitter (phase noise), and provides insight into the root cause(s) of jitter.