The variable capacitance diode KV1471E of Shikues, also known as “variable reactance diode”, is made by taking advantage of the characteristics that the size of the junction capacitance changes with the applied voltage when the PN junction is reverse biased.When the reverse bias voltage increases, the junction capacitance decreases, and vice versa, the capacitance of the varactor diode is generally small, its maximum value is tens of pF to hundreds of pF, and the ratio of the maximum capacitance to the minimum capacitance is about 5:1.
It is mainly used for auto-tuning, frequency modulation and equalization in high-frequency circuits, for example, as a variable capacitor in the tuning circuit of a television receiver.