Patent ID: 8492823

Claim:
A method of fabricating a varactor in a semiconductor structure, comprising the steps of: providing a substrate; and forming a non-planar varactor on or above the substrate, including forming a mesa comprised of an active semiconductor material doped with a given ion implant and having a variable dopant concentration, the mesa having an inwardly sloping outside surface and including a variable size charge neutral region and a depletion region, said a depletion region including a narrower portion fully depleted of said ion implant, and a wider portion partially depleted of said ion implant; and providing the varactor with a contact region for applying a variable voltage to the varactor to change the size of the charge neutral region of the mesa; wherein the effective area of the varactor varies with the voltage applied to the varactor in a customized manner, and the varactor provides a predetermined capacitance vs. voltage behavior.