Bandwidth of DSB signal - Calculation

Q.  Calculate the bandwidth occupied by a DSB signal when the modulating frequency lies in the range from 100 Hz to 10KHz.
- Published on 12 Oct 15

a. 28 KHz
b. 24.5 KHz
c. 38.6 KHz
d. 19.8 KHz

ANSWER: 19.8 KHz
 
Here the fm = 100Hz to 10 KHz = 10000 - 100 = 9900 Hz

Therefore, Bandwidth = 2 fm = 2 * 9900 = 19.8KHz

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