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Find lower frequency component in AM wave, given that highest frequency component is 900KHz and bandwidth is 12KHz?

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Find lower frequency component in AM wave, given that highest frequency component is 900KHz and bandwidth is 12KHz?

(a) 832KHz

(b) 600KHz

(c) 868KHz

(d) 888KHz

This question was addressed to me in an online interview.

My doubt stems from Single Tone Modulation in section Amplitude Modulation of Analog Communications

1 Answer

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The correct option is (d) 888KHz

The explanation: Highest frequency component is 900KHz and bandwidth is 12KHz. So lower frequency component is 900 – 12 = 888KHz.

(Formula: Fmin = Fmax-2*fm = Fmax-Bandwidth,  where fm = Message Signal Frequency).

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