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Application Note: How Signal Generator Spectral Purity Affects Measurements

This application note explains how the spectral purity of a signal generator influences the accuracy and reliability of RF and microwave measurements.

  • Understand the key components of spectral purity — including phase noise, spurious signals, and residual FM — and how they influence signal stability.

  • Recognize how degraded spectral purity can distort measurement results, obscure weak signals, or mask device-under-test behavior.

  • Apply strategies and best practices to mitigate spectral impurities and preserve measurement fidelity in real-world test setups.

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