Patent ID: 7138321
Filing Date: 2006-11-21
Classification: G11B,H03K

Abstract:
1. A method of forming a capacitor, the method comprising: forming a capacitor body in a portion of a semiconductor substrate, the capacitor body being of a first conductivity type and being a first plate of the capacitor; forming a plurality of regions at locations in the semiconductor substrate, the regions including regions of a second, opposite conductivity type than the capacitor body and the plurality of regions being a second plate of the capacitor; forming an electrical conductor coupled to the plurality of regions to couple the plurality of regions to each other; forming an insulating layer overlying portions of the capacitor body and the plurality of regions at selected locations; and forming a conductive layer overlying the insulating layer, the conductive layer being an additional plate of the capacitor such that an effective capacitance of the capacitor is determined by a capacitance of the conductive layer to the capacitor body and a capacitance of the conductive layer to the plurality of regions, wherein forming the electrical conductor coupled to the plurality of regions to couple the plurality of regions to each other includes: coupling regions of said plurality that have opposite conductivity types to each other.