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  • (a) How is amplitude modulation achieved ? (b) The frequencies of two sidebands in an AM wave are  and <img alt="660\; KHz" src="https://entranc

(a) How is amplitude modulation achieved ?
(b) The frequencies of two sidebands in an AM wave are 640\; KHz and 660\; KHz respectively. Find the frequencies of carrier and modulating signal. What is the bandwidth required for amplitude modulation?

 

 
 
 
 
 

Answers (1)

(a) In amplitude modulation amplitude of the carrier wave is varied according to the information signal

(b) given

f_{c}+f_{m}=660 \; KHz

f_{c}-f_{m}=640 \; KHz

\Rightarrow \; \; 2f_{c}=1300

           f_{c}=650 \; KHz

      \therefore f_{m}=10 \; KHz

Bandwidth = 2f_{m}=20 \; KHz

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Safeer PP

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