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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