Patent ID: 7091535

Claim:
A high voltage integrated circuit structure comprising: a gate electrode over a substrate; source and drain regions within the substrate on opposite sides of, and adjacent to, the gate electrode; a deep n-well within the substrate; an n-well located within the deep n-well and at least partially under the gate electrode, the n-well extending up to a top surface of the substrate; a drain high voltage p-well within said substrate, and an isolation region partially underlying an end of said gate electrode, said isolation region partially underlying said gate electrode on said side of said gate electrode having said drain region, said drain region lying within the drain high voltage p-well, wherein said gate electrode overlies and directly contacts a portion of the drain high voltage p-well where the isolation region does not overlie the drain high voltage p-well, and the isolation region is located so that the drain high voltage p-well underlies the isolation region entirely.