Patent ID: 8164144

Claim:
A semiconductor device comprising: an insulating layer; a semiconductor layer formed on the insulating layer; a first partially depleted transistor formed in the semiconductor layer; and a first diode formed in the semiconductor layer, wherein the first transistor has a first gate electrode formed above the semiconductor layer via an insulating film and a first source or a first drain of a first conductivity type formed in the semiconductor layer below both sides of the gate electrode, the first diode has a first impurity layer of a second conductivity type formed in a shallow portion of the semiconductor layer and a second impurity layer of the first conductivity type formed in a deep portion of the semiconductor layer, the first impurity layer and the second impurity layer are stacked in a depth direction of the semiconductor layer, and a side surface of the first impurity layer and a side surface of the second impurity layer are in contact with the semiconductor layer in a region just below the first gate electrode.