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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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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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Identification: 

A is the square law device. 

B is the bandpass filter.

Functions:

Square law device is a non linear device and produces the output. Bandpass filter rejects dc and sinusoidal frequencies,ωm, 2ωm,2ωc and gives the AM wave as its output.

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