Patent ID: 8237219

Claim:
A semiconductor device comprising: a first transistor of a first conductivity type including, a first gate electrode having a first width, a first sidewall spacer formed on a sidewall of the first gate electrode and having a second width, a first channel region formed in a semiconductor substrate under the first gate electrode, and a first source/drain region formed in the semiconductor substrate; and a second transistor of the first conductivity type including, a second gate electrode having a third width, a second sidewall spacer formed on a sidewall of the second gate electrode and having a fourth width wider than the second width, a second channel region formed in the semiconductor substrate under the second gate electrode, and a second source/region formed in the semiconductor substrate, wherein a first length of the first source/drain region in a direction perpendicular to the first gate electrode is shorter than a second length of the second source/drain region in a direction perpendicular to the second gate electrode, and impurity concentrations in the first source/drain region are substantially equal to impurity concentrations in the second source/drain region.