First slide

Modulation

Question

An amplitude modulated wave is represented by the expression $v_{m} = 5 (1 + 0.4 \cos 6280 t) \sin (211 \times 10^{4} t)$ volts. The minimum and maximum amplitudes of the amplitude modulated wave are, respectively

Easy

A

$3 V, 7 V$
B

$3 V, 5 V$
C

$5 V, 8 V$
D

$\frac{3}{2} V, 5 V$

Solution

$v_{m} = 5 (1 + 0.4 \cos 6280 t) \sin (211 \times 10^{4} t) G i v e n : v_{c} = 5 a n d μ = 0.4$
Minimum amplitude $= v_{c} (1 - μ) = 5 (1 - 0.4) = 3$
Maximum amplitude $= v_{c} (1 + μ) = 5 (1 + 0.4) = 7$
No correct options

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