15Mar/100

## 3dB point & FWHM

When someone refers to the 3dB point of a graph, they are referring to the 50% point. This can be explained through its derivation:

Going forward with this definition, the **F**ull **W**idth **H**alf **M**ax (FWHM) of a figure is defined by the 3dB point. To find the FWHM of a graph, you find the 2 points at which the graph crosses the half-max point (0.5 x peak's max value) - the horizontal distance between the two points is the FWHM.