Patent ID: 7476593

Claim:
A method of forming a semiconductor device, comprising: providing a substrate of a first conductivity type; implanting a buried layer of a second conductivity type, the buried layer forming a portion of a conductive isolation feature; depositing an epitaxial layer of the first conductivity type overlying the buried layer, wherein a portion of the epitaxial layer forms a first portion of an anode; implanting first and second regions with the first conductivity type and the second conductivity type, respectively, the first region corresponding to a second portion of the anode and the second region corresponding to a first portion of a cathode; etching regions for oxide isolation and depositing oxide into the etched regions; implanting a third region with the first conductivity type, the third region corresponding to a third portion of the anode; and implanting a fourth region with the second conductivity type, the fourth region forming a second portion of the conductive isolation feature.