Topic: Communication Systems
Two carriers of 2 GHz and 4 GHz respectively are frequency modulated by a signal of 10 kHz, such that bandwidth of the FM signal in the two cases are same. The peak deviation in the two cases are in the ratio of
- A. 1:8
- B. 1:2
- C. 2:1
- D. 1:1
Answer: D. 1:1
Explanation: According to Carson's rule, the bandwidth of an FM signal is BW = 2(Delta_f + fm), where Delta_f is the peak frequency deviation and fm is the modulating frequency. Since both the BW and fm (10 kHz) are the same for both signals, their peak deviations (Delta_f) must also be the same. The ratio is 1:1.