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Questions and Answers
How does a Phase Locked Loop (PLL) function as an FM demodulator?
A PLL can function as an FM demodulator by locking onto the frequency of the FM signal. As the frequency of the FM signal changes, the PLL adjusts its oscillator to maintain phase lock, and the resulting control voltage is the demodulated FM signal.
What are the key differences between narrow band and wide band FM modulation?
Narrow band FM has a smaller frequency deviation and narrower transmission bandwidth compared to wide band FM. Narrow band FM is typically used for voice communications, while wide band FM is used for high-fidelity music transmissions.
Explain the concept of modulation index in frequency modulation.
The modulation index in FM is the ratio of the frequency deviation to the modulating frequency. It determines the extent of frequency deviation in the FM signal and impacts the signal's bandwidth and spectral characteristics.
