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Undersampling ADC for RMS conversion possible?

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nkmonty

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Hello, I wanted to get opinions of the community on this topic:
Suppose you have ADC with sampling frequency Fs and all you are interested in in calculating RMS value of the input AC signal using digitized data.
If the AC signals contains harmonics above Fs/2 (Nyquist freq), you'll get fold back frequency components (aliasing) into Nyquist zone due to under sampling. But since you are not trying to recreate the original waveform, and just computing RMSm will your RMS computation still be correct (since you basically transforming higher frequency sine harmonics to lower frequency with the same amplitude due to aliasing)?
 

Hi,

Yes, undersampling is possible. But avoid fs to be integer division of f_AC.

Klaus
 
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