communication-systems Question 31
Question: Q. 5. In the block diagram of a simple modulator for obtaining an $A M$ signal, shown in the figure, identify the boxes $A$ and $B$. Write their functions.
U] [O.D. I, II, III 2013]
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Solution:
Ans. $A=$ Square lafw device
$B=$ Bandpassfilter.
Band pass filter rejects low and high frequencies andallows a band of frequencies to pass through. Square law device is a non-linear device. It produces a non-linear output of message and carrier signals.
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