Exam-style question
Try this first
Which statement correctly compares the bandwidth requirements of AM and FM?.
- A.AM requires a larger bandwidth than FM for the same audio quality.
- B.FM requires a larger bandwidth than AM for the same audio quality.
- C.Both require the same bandwidth if the carrier frequency is the same.
- D.Bandwidth is irrelevant for both modulation types.
Model answer
What a good answer should say
- FM requires a larger bandwidth than AM for the same audio quality.
Explanation
Why this works
Define both: AM uses amplitude variations, FM uses frequency variations. Identify key difference: FM’s frequency deviation spreads the signal over a wider frequency range, demanding more bandwidth.
Explain when each applies: When the same audio fidelity is desired, FM occupies more spectrum than AM. Conclude: The correct comparison is that FM requires a larger bandwidth.
Common mistake
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