Major application are the TV and VCR tuners as shown in the right upper diagram. Another application would be the generic front end, as shown in the left lower diagram. Possible positions would be the LNA and in the local oscillator. Key parameters for Varactor diodes are the C = ƒ(V) curve, which is the curve of Capacitance as a function of the reverse applied voltage, on wafer capacitance matching, and series resistance.