Patent ID: 7109553

Claim:
A semiconductor device comprising: a substrate having a first region with a digital circuit formed therein, and a second region with an analog or RF (radio frequency) circuit formed therein; a first semiconductor element formed in said first region and constituting said digital circuit; and a second semiconductor element formed in said second region and constituting said analog or RF circuit, said first semiconductor element including a first gate electrode formed on a main surface of said substrate, with a first gate insulation film therebetween, a first body region formed in said substrate under said first gate electrode, and a pair of first source/drain regions formed in said substrate, with said first body region disposed between said pair of first source/drain regions, said second semiconductor element including a second gate electrode formed on said main surface of said substrate, with a second gate insulation film therebetween, a second body region formed in said substrate under said second gate electrode, and a pair of second source/drain regions formed in said substrate, with said second body region disposed between said pair of second source/drain regions, said pair of first source/drain regions having a pair of first extensions, respectively, extending toward under said first gate electrode in said main surface of said semiconductor layer, said pair of second source/drain regions having a pair of second extensions, respectively, extending toward under said second gate electrode in said main surface of said semiconductor layer, wherein the amount of overlap between said first gate electrode and said first extensions as viewed in plan is greater than the amount of overlap between said second gate electrode and said second extensions as viewed in plan.