Patent ID: 6999296

Claim:
A voltage controlled variable capacitance device comprising: a substrate; and one or more first varactor elements and one or more second varactor elements formed on a surface of said substrate and interconnected in parallel, each of said first and second varactor elements including: a well formed on the surface of said substrate and connected to a first terminal; an insulating film formed on said well; and an electrode formed on said insulating film and connected to a second terminal, said insulating film being sandwiched between said well and said electrode, wherein the thickness of said insulating film of said one or more first varactor elements are thinner than the thickness of said insulating film of said one or more second varactor elements, and the number of said one or more first and second varactor elements is set in accordance with a desired correlation between a voltage applied between said first terminal and said second terminal and a capacitance between said well and said electrode.