RIGOL: Why Clock Recovery Matters in High-Speed Digital Testing

Many modern serial communication systems do not provide a separate clock signal. Instead, timing information must be extracted directly from the data stream itself.

This application note explains the principles of Clock and Data Recovery (CDR) and its role in signal integrity analysis. It covers different recovery methods, including PLL-based recovery, constant frequency recovery, and external clock recovery techniques. The document also discusses threshold settings, signal types such as NRZ and PAM4, and practical setup considerations for accurate measurements.

Clock recovery forms the foundation for advanced measurements such as eye diagrams, jitter analysis, and protocol compliance testing.

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