First slide

Modulation

Question

The amplitude of modulated current is given by $i = 70 (1 + 0.06 \sin 2900 t) \sin 10^{6} t$ The depth of modulation is

Easy

A

60 %
B

6 %
C

36 %
D

66 %

Solution

$i = A_{c} (1 + \frac{A_{m}}{A_{c}} \sin ω_{m} t) \sin ω_{c} t$
$D e p t h o f m o d u l a t i o n = \frac{A_{m}}{A_{c}} x 100 = 0.06 x 100 = 6 %$

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