Patent ID: 8450808

Claim:
A device comprising: a semiconductor substrate; a first and a second High-Voltage Metal-Oxide-Semiconductor (HVMOS) device, each comprising: a gate electrode over the semiconductor substrate, wherein the gate electrode of the first HVMOS device and the gate electrode of the second HVMOS device have a first gate length and a second gate length, respectively, with the second gate length being greater than the first gate length; a first and a second well region of a p-type and an n-type, respectively, wherein each of the first and the second well regions overlaps a portion of the gate electrode; and a native region between and contacting the first and the second well regions, wherein the first and the second well regions have higher impurity concentrations than the native region, wherein the native region of the first HVMOS device and the native region of the second HVMOS device have a first native-region length and a second native-region length, respectively, and wherein the second native-region length is greater than the first native-region length.