Question

For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is found to be 2 V. Determine the modulation index μ. What would be the value of μ if the minimum amplitude is zero volt?

Answer 1

Maximum amplitude, A_max = 10 V

Minimum amplitude, A_min = 2 V

Modulation index μ, is given by the relation:

`mu= (A_"max" - A_"min")/(A_"max" + A_"min")`

`= (10 - 2)/(10 + 2) = 8/12 = 0.67`

if A_"min" = 0

Then `mu = A_"max"/A_"max"= 10/10 = 1`