Varactor, in particular for radio-frequency transceivers

摘要

A varactor has a gate region, first and second biasing regions of N+ type embedded in a well, and first and second extraction regions of P+ type, forming a pair of PN junctions with the well. The PN junctions are inversely biased and extract charge accumulating in the well, below the gate region, when the gate region is biased to a lower voltage than a predetermined threshold value.