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Communication Systems - Engineering

Q1:

A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is

A 370 kHz

B 190 kHz

C 380 kHz

D 95 kHz

ANS:C - 380 kHz

If we square the signal, bandwidth will becomes double.  B.W. for x(t) = 2(90 + 5) = 190 kHz for x2(t) = 2 x 190  380 kHz.