Varactors manufactured using deep trench isolation

A method, comprising:

• etching a first trench in a substrate, the substrate doped to form a well;
• etching a second trench in the substrate parallel to the first trench;
• filling the first trench and the second trench with a dielectric;
• and
• placing a conductor within the dielectric;
• wherein the substrate forms a bottom electrode of a first varactor and a second varactor, the conductor in the first trench forming a top electrode of the first varactor, and the conductor in the second trench forming a top electrode of the second varactor.

A varactor made by a process comprising:

• etching a first trench in a substrate, the substrate doped to form a well;
• etching a second trench in the substrate parallel to the first trench;
• filling the first trench and the second trench with a dielectric;
• and
• placing a conductor within the dielectric;
• wherein the substrate forms a bottom electrode of a first varactor and a second varactor, the conductor in the first trench forming a top electrode of the first varactor, and the conductor in the second trench forming a top electrode of the second varactor.