Summary

This blog shows how harmonics produced by ADCs or DACs can fold back into the passband as aliased spurs and uses animated visualizations to make the aliasing mapping intuitive. Readers will learn how to predict where harmonics will appear, how to distinguish aliased spurs from genuine tones, and practical mitigation steps for converter measurements.

Key Takeaways

• Identify which harmonic orders will alias given an input tone and sampling rate.
• Map aliased spectral components back to their original harmonic frequencies using animated FFT visualizations.
• Design or select appropriate anti-aliasing and reconstruction filters to suppress aliased spurs.
• Apply measurement and diagnostic procedures to distinguish true input tones from aliased converter harmonics.

Who Should Read This

Signal processing and test engineers working with ADCs/DACs who need practical diagnostics and visualization techniques to find and mitigate aliased harmonics.

TimelessIntermediate

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