The maximum amplitude of an A.M.


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?


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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