Capacitor with an electrode well
AssigneeNXP USA, Inc.
InventorsRonghua Zhu, Xin Lin, Todd Roggenbauer
Life of this patent
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Abstract
A capacitor includes an electrode implemented in an electrode well of a substrate. The electrode well has a net N-type dopant concentration. The capacitor includes an electrode implemented in a conductive structure located above the substrate. The electrodes are separated by a dielectric layer located between the electrodes. A first tub region having a net P-type conductivity dopant concentration is located below and laterally surrounds the electrode well and a second tub region having a net N-type conductivity dopant concentration is located below and laterally surrounds the first tub region and the electrode well.
Claims18
An integrated circuit comprising:
- a substrate including semiconductor material, the substrate including:
- an electrode well of semiconductor material having a net N-type dopant concentration, the electrode well serving as a first electrode for a capacitor;
- a first tub region of semiconductor material having a net P-type dopant concentration, the first tub region including a bottom portion located directly below the electrode well and side portions directly laterally surrounding the electrode well;
- a second tub region of semiconductor material having a net N-type dopant concentration, the second tub region including a bottom portion located directly below the electrode well and directly below the bottom portion of the first tub region and side portions directly laterally surrounding the electrode well and directly laterally surrounding the side portions of the first tub region;
- a structure, the structure is of a material that is other than a semiconductor material having a net N-type dopant concentration, the bottom portion of the second tub region is located directly over the structure;
- a dielectric layer located directly over the electrode well, the dielectric layer serves as a dielectric for the capacitor;
- a conductive electrode structure located directly over the dielectric layer and directly over the electrode well, the conductive electrode structure serves as a second electrode for the capacitor.
Dependencies are inferred from the claim text.