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FM signals can be generated by using ________

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FM signals can be generated by using ________

(a) Varacter diode

(b) Laser diode

(c) Backward diode

(d) Gunn diode

I got this question in an interview for internship.

This intriguing question comes from Phase Shift Method in section SSB Modulation of Analog Communications

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The correct choice is (a) Varacter diode

The best I can explain: Varactor diode is a diode working in the reverse-bias because of which no current flows through it. It has variable capacitance which varies with applied voltage. Varactor diodes are mainly used in generation of FM signals using Voltage Controlled Oscillator.

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