Question
A sinusoidal carrier voltage is amplitude modulated. The resultant amplitude modulated wave has maximum and minimum amplitude of $120\,V$ and $80\,V$ respectively. The amplitude of each sideband is $..........V$
✓
Answer
$A _{ c }+ A _{ m }=120$
$A _{ c }- A _{ m }=80$
$\therefore A _{ c }=100$
$A _{ m }=20$
Modulation index $=\frac{20}{100}=\frac{1}{5}$
Amplitude of each sideband
$= A _{ c } \frac{( mod \text { ulation index) }}{2}$
$=100 \times \frac{1}{10}=10 \text { volt }$
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