Patent ID: 8704312

Claim:
A high voltage (HV) device comprising: a well region of a first dopant type disposed in a substrate; a first well region of a second dopant type disposed in the well region of the first dopant type; an isolation structure at least partially disposed in the well region of the first dopant type; a first gate electrode disposed over the isolation structure and the first well region of the second dopant type; a second well region of the second dopant type disposed in the well region of the first dopant type, the second well region of the second dopant type being spaced from the first well region of the second dopant type; a second gate electrode disposed between and over the first well region of the second dopant type and the second well region of the second dopant type; a buried well region of the first dopant type disposed below the well region of the first dopant type; and a third well region of the second dopant type disposed between the well region of the first dopant type and the buried well region of the first dopant type, wherein the third well region of the second dopant type is electrically coupled with the first well region of the second dopant type.