A sinusoidal carrier voltage of 80 volts amplitude and 1 MHz frequency is amplitude modulated by a sinusoidal voltage of frequency 5kHz producing `50%` modulation. Calculate the amplitude and frequency of lower and upper side bands.

Answer

Amplitude of both LSB and USB are equal and given by `=(mE_(c))/(2)=(0.5*80)/(2)=20"volts"`
Now frequency of LSB `=f_(c)-f_(s)=(1000-5)` kHz = 995 kHz
Frequency of USB `=f_(c)+f_(s)=(1000+5)` kHz = 1005 kHz

Explanation

Amplitude of both LSB and USB are equal and given by `=(mE_(c))/(2)=(0.5xx40)/(2)=20"volts"`
Now frequency of LSB `=f_(c)-f_(s)=(1000-5)` kHz = 995 kHz
Frequency of USB `=f_(c)+f_(s)=(1000+5)` kHz = 1005 kHz