A carrier wave of amplitude 15 V is modulated by a sinusoidal baseband signal of amplitude 3 V. The ratio of maximum amplitude to minimum amplitude of the AM wave is:
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Question

A carrier wave of amplitude 15 V is modulated by a sinusoidal baseband signal of amplitude 3 V. The ratio of maximum amplitude to minimum amplitude of the AM wave is:

G1 Physics · Accepted Answer

For amplitude modulation, A(max) = A(c) + A(m) = 15 + 3 = 18 V A(min) = A(c) − A(m) = 15 − 3 = 12 V Therefore, A(max)/A(min) = 18/12 = 3/2 Hence option D follows.