Question
Asked Nov 23, 2019
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What will be the maximum efficiency of an AM modulator?

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Expert Answer

Step 1

For an amplitude modulated system, the efficiency is defined as

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-x100%-_>(1) P3 Baseband signal power P Carrier signal power

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Step 2

Since the message and the carrier signal are of sinusoidal nature, the baseband signal power can be expressed as

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-P -->(2) 2 Modulation Index

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Step 3

Therefore, from equation (1), the efficiency becomes

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-Pc 2 -x100% 2 100%--->(3) x 2+ => '1

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