Question

An amplitude modulated wave is represented by,

v_AM = 4(1+0.2 sin 314 t) sin (314 x 10²t)

Amplitude of the sidebands will be equal to,

(1) 0.4 V

(2) 0.8 V

(3) 1.2 V

(4) 4 V

Answer 1

(1) 0.4 V

Instantaneous voltage of the amplitue modulated wave is represented by,

Here, 

V_c = 4

Modulation Index = m = 0.2

Therefore, amplitude of the sidebands = mV_C/2 = 0.4V