Explain the construction and working of varactor diode. Write its two applications.
A varactor diode, also known as a varicap or tuning diode, is a type of semiconductor diode that functions as a variable capacitor when reverse-biased. It is constructed using a p-n junction, where the reverse-biased junction forms a depletion region that behaves ______ __________ ______ _________ _________ _________ ________ _____ __________.
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