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Variable capacitance diode (Varactor Diodes), also known as variable reactance diode". Is a use of PN junction capacitance (capacitance) and reverse bias voltage dependence of Vr and the principle of diode.
1, the varactor is a semiconductor device manufactured by using the principle of PN junction between the variable capacitance of the variable capacitor for use in high frequency tuning and communication circuit.
Varactor diode belongs to reverse bias diode reverse bias on the change of PN, PN junction capacitance can be changed. The higher the reverse bias voltage, capacitance is less, the relationship between the reverse bias voltage and junction capacitance is nonlinear, as shown on the right.
2, capacitance capacitance and reverse bias value of the relationship diagram:
(a) increased reverse bias, resulting in reduced capacitance;
(b) decreased reverse bias, resulting in increased capacitance.
Capacitance error range is a specified capacitance range of varactor. The data table displays the minimum, the nominal, and the maximum values, which are often drawn on the map.