The spectrum of message signal m(t) is shown below.

This message signal is first passed through a DSB-SC modulator, which is working with a carrier frequency of 10 kHz. The resultant DSB-SC signal is passed through an AM modulator, which is working with a carrier frequency of 100 kHz. The bandwidth of the resultant AM Signal is

30 kHz

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40 kHz

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10 kHz

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20 kHz

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Solution

The correct option is A 30 kHz
Spectrum of the DSB-SC signal

Spectrum of the final AM signal.

So, the bandwidth of the resultant AM signal is 30 kHz.

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