InterviewSolution
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InterviewSolution
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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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Answer» In the block diagram of modulator, A is square law device and B is band pass 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. The output of square law device is, `y(t) = Bx(t) + Cx^(2)(t)` where B and C are constants and x(t) = message signal `(A_(m)sin omega_(m)t)` + carrier signal `(A_(c)sin omega_(c)t)` |
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