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Question

In an angle modulated signal, the modulating frequency is increased from 20 kHz to 40 kHz.If the signal is frequency modulated, then the modulated signal bandwidth is

A
Halved
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B
Decreased by 40 kHz
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C
Doubled
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D
Increased by 40 kHz
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Solution

The correct option is D Increased by 40 kHz
BW=2(Δf+fm)=2Δf+2fm(BW)new=2Δf+2fnew=2Δf+2(fm+20)=2Δf+2fm+40kHz(BW)new=(BW)+40kHz

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