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What is the use of a varactor diode in radio receiver?(a) Demodulation(b) Mixing(c) Multiplexing(d) TuningThis question was posed to me in my homework.I need to ask this question from Receiver topic in division Elements of Communication System of Analog Communications

Answer»

Correct answer is (d) TUNING

The explanation: 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 Voltage CONTROLLED Oscillators (VCOS) and RF Filters for tuning the receiver to the incoming signal or different stations.



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