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FM is called constant envelope because ______ of carrier wave is kept constant.

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FM is called constant envelope because ______ of carrier wave is kept constant.

(a) Frequency

(b) Amplitude

(c) Phase

(d) Angle

This question was addressed to me in final exam.

Query is from Angle modulation topic in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right option is (b) Amplitude

Easiest explanation: FM is called the constant envelope because amplitude of the carrier wave is kept constant. It is duo to the fact that the envelope of the carrier does not change with changes in the modulating signal.

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