Patent ID: 7898027

Claim:
A metal-oxide-semiconductor (MOS) device, comprising: a semiconductor substrate having a first conductive type; a gate structure, disposed on the semiconductor substrate, substantially parallel with a first direction; a drain region having a second conductive type, disposed in the semiconductor substrate; a source region, disposed in the semiconductor substrate, the drain region and the source region are disposed on two opposite sides of the gate structure, the source region comprising: at least a source doped region having the second conductive type, disposed on a side of the gate structure; and a plurality of source contact regions having the first conductive type, the source contact regions and the source doped region being alternately arranged along the first direction; and a channel region, disposed in the semiconductor substrate under the gate structure, and between the source region and the drain region, wherein the channel region has a channel width, and the first direction is an extended direction of the channel width.