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The input to a conventional amplitude modulator is the periodic message signal m{t) sketched below. Assume that the carrier frequencv f: x: :1. Let
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The input to a conventional amplitude modulator is the periodic message signal m{t)
sketched below. Assume that the carrier frequencv f: x: :1. Let the unmodulated carrier amplitude he AL. = 5 F.
a] Write an expression for the conventional amplitude modulated signal. b} What should be the maximum amplitude sensitivity:r ofthe modulator so that
there is no overmodulation [i.e. no envelope distortion]? :1 What should be the amplitude sensitivity:r for 60% modulation? Make a sketch
of the modulated time-domain signal for this case. Show the minimum and
maximum values ofthe envelope in 1your sketch. d] For the case mentioned in part c: i] Calculate the total power in the sidebands.
ii] Calculate the power in the carrier component. iii} Calculate the total power in the modulated signal. mltl

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