Question

A modulating signal 2sin (6.28 × 106) t is added to the carrier signal 4sin(12.56 × 109) t for amplitude modulation. The combined signal is passed through a non-linear square law device. The output is then passed through a band pass filter. The bandwidth of the output signal of band pass filter will be ______MHz.

Answer 1

WC=12.56×109
Wm=6.25×106
After amplitude modulation
Bandwidth frequency
=$\frac{2W_m}{2_π}$
=$\frac{2×6.28}{2π}×10^6$
=2 MHz
So, the answer is 2.