The maximum amplitude of an A.M.

Question:

The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?

Solution:

Modulation index is defined as the ratio of change of amplitude of carrier wave to the amplitude of the original carrier wave.

The maximum amplitude of AM wave is = Amax = Ac + Am = 15 V

The minimum amplitude of the AM wave is = Amin = Ac – Am = 3V

m = modulation index = Am/Ac = 2/3

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