Patent ID: 7910441

Claim:
A method for constructing a semiconductor device comprising: providing a substrate having a first dopant type; forming a first gate electrode over the substrate; and forming a second gate electrode over the substrate and spatially separated from the first gate electrode, wherein the first gate electrode has a first length and the second gate electrode has a second length, the second length being substantially different from the first length; forming a first region of a second dopant type in the substrate between and partially underlying the first and second gate electrodes, the first region having a first dopant concentration; forming a separation region of the second dopant type in the first region, the separation region being spaced apart from the first and second gate electrodes and having a second dopant concentration that is greater than the first dopant concentration; forming a source region in the semiconductor substrate on an opposing side of the first gate electrode from the first region, the source region having the second dopant type; and forming a drain region in the semiconductor substrate on an opposing side of the second gate electrode from the first region, the drain region having the second dopant type.