Electronics Handbook/Components/Diodes/Variactor
This kind of diode conducts in both the forward and backward directions. When conducting in backward direction, the diode operates like a capacitor with capacitance in the picofarads.
The circuit symbol of variactor diode:
Operation
[edit | edit source]When negative voltage is applied to a variactor diode, the junction of the diode is widened and exhibits the capacitance of a capacitor.