PSD units conversion

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Baba 2011-11-1

I would like to have units of V/RootHz on the Y axis. I can get Volts by removing 10*log10 from code blow, but how do I get /rootHz Code:

fs=2000;

Hs=spectrum.periodogram; % Use default values

psdest = psd(Hs,Signal,'Fs',fs);

semilogx(psdest.Frequencies,10*log10(psdest.Data));

grid on;

Wayne King 2011-11-1

You get V^2 by removing 10*log10(), not V.

What do you mean by V/rootHz?

Guglielmo 2012-1-26

Wait be careful.

PSD is a power so it's unit is dB re V^2/Hz (I assume the input signal is in V).

Removing dB you have V^2/Hz or with sqrt V/sqrt{Hz}.

Don't forget there is a spectral band

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