Patent ID: 7999331

Claim:
A semiconductor device comprising a first MIS transistor of a first conductivity type and a second MIS transistor of the first conductivity type on a semiconductor substrate, the first MIS transistor including: a first gate insulation film on the semiconductor substrate in a first region, a first gate electrode on the first gate insulation film, a first channel region of a second conductivity type in the first region, the first channel region having a retrograde channel structure, and a first extension region of the first conductivity type below side of the first gate electrode in the first region, and the second MIS transistor including: a second gate insulation film on the semiconductor substrate in a second region, a second gate electrode on the second gate insulation film, a second channel region of the second conductivity type in the second region, the second channel region having a surface channel structure, and a second extension region of the first conductivity type below side of the second gate electrode in the second region.