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Which of the following devices is used to generate AM waves?

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Which of the following devices is used to generate AM waves?

(a) Square-law modulator

(b) Reactance modulator

(c) Transmitter

(d) Transducer

This question was posed to me in an online interview.

This interesting question is from Generation of AM Waves topic in chapter Amplitude Modulation of Analog Communications

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Best answer
The correct option is (a) Square-law modulator

Best explanation: AM signals are generated by Square-law modulators. The input for generating AM signal should be of type (A + m(t)) instead of m(t). Square-law modulator sums carrier and information signal, then passes them through a non-linear device.

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