Plasma Dreamstime Martin Capekl 103381930

What’s the Difference Between Power Density and Power Spectral Density? (Download)

April 11, 2023

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The basic definition of power density is the rated (or nominal) output power of a device divided by the volume (volume = x · y · z) occupied by the device. Common units of measurement for power density can be watts per cubic meter (W/m3) or watts per cubic inch (W/in.3).

Power spectral density (PSD) is the measure of a signal's power content versus frequency. PSD gives designers an idea of how the power of a signal is distributed over frequency. PSD is usually chosen to characterize random broadband signals.


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