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In the block diagram of a simple modulator for obtaining an AM signal, shown in the figure,

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In the block diagram of a simple modulator for obtaining an AM signal, shown in the figure, identify the boxes A and B. Write their functions.

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A = Square law device

B = BandPass filter. 

Band pass filter rejects low and high frequencies and allows 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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