Question

A sinusoidal carrier signal of peak amplitude 5V and frequency 100 kHz is amplitude modulated by a 5 kHz signal of peak amplitude 3V. What is modulation index? Draw the spectrum of modulated signal.

Answer 1

V_C = 5V,

f_c = 100kHz,

V_m = 3V,

f_m = 5kHz

Modulation index,

m_a = \(\frac{V_m}{V_C}=\frac{3}{5}=0.6\)

Amplitude of each sideband