How to Test USB4 Version 2.0 Receiver Compliance

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High-Performance Bit Error Ratio Tester
+ High-Performance Bit Error Ratio Tester
High-Performance Bit Error Ratio Tester
+ High-Performance Bit Error Ratio Tester

Testing USB4 Version 2.0 receiver compliance using a bit error ratio tester

USB4 Version 2.0 receiver compliance test requires a bit error ratio tester (BERT), a high-bandwidth oscilloscope, a vector network analyzer (VNA), an arbitrary waveform generator (AWG), and the USB-IF SigTest utility. Automated application software and SigTest can automate calibration, measurement, and test case execution as specified in the USB4 Gen 4 Electrical Compliance Test Specification, defined by the Universal Serial Bus Implementers Forum (USB-IF). USB4 Version 2.0 adds PAM3 signaling, which includes a third test case for link partners connected to a linear redriver.

Precision calibration is necessary to ensure the device under test (DUT) passes conformance specifications. This process requires finely calibrating the AWG and BERT stress signal using a high-performance oscilloscope and the receiver using the VNA. During the receiver test, the DUT initiates link training, after which the BERT's pattern generator injects the stress signals on the lane under test. The SigTest and test automation software work together to perform the BER test, which validates whether the DUT performs under the allowance defined by the USB compliance test specification.

USB4 Version 2.0 receiver test setup, featuring a UXR-series oscilloscope, an M8040A Bit error ratio tester, and a laptop running N5991U42A software.

USB4 Version 2.0 receiver compliance test solution

USB4 Version 2.0 receiver testing requires precise receiver and stress signal calibration, consistently repeatable PAM3 pattern generation, and bit error rate measurements. The Keysight USB4 Version 2.0 receiver test solution simplifies compliance testing with receiver test automation software, which helps developers navigate the complex testing requirements, calibrate hardware, and automate compliance tests to compare device performance results to the USB-IF test specification.
 
A 64 GBaud high-performance BERT runs the software and a 65 GSa/s AWG generates the patterns. The Keysight ENA is key to precisely calibrating the receiver before testing. USB-IF's SigTest software utility runs on a Keysight Infiniium UXR-B Series high-performance oscilloscope with PAM3 analysis capabilities and enough bandwidth to measure the stressed signal from the BERT. The hardware and software work seamlessly together to compare the USB device's receiver performance to the USB-IF compliance requirements.
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