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

1.	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.
Answer» Boxes ‘A’ and ‘B’ represents (i) square law device (ii) band pass filter (i) Square law device is a non linear device and produces the output y(t) =Bx (t) +Cx(t)² where B and C are constants. (ii) It rejects dc and sinusoids of frequencies ω_m, 2ω_mand 2ω_c and finally produces amplitude modulated wave by retaining frequncies ω_c, ω_c – ω_m and ω_c + ω_m.

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.

Answer»

Boxes ‘A’ and ‘B’ represents

(i) square law device

(ii) band pass filter

(i) Square law device is a non linear device and produces the output

y(t) =Bx (t) +Cx(t)²

where B and C are constants.

(ii) It rejects dc and sinusoids of frequencies ω_m, 2ω_mand 2ω_c and finally produces amplitude modulated wave by retaining frequncies ω_c, ω_c – ω_m and ω_c + ω_m.

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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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