Patent ID: 7834402

Claim:
A semiconductor integrated circuit device comprising: a logic circuit of a CMOS type formed by combining a field-effect transistor group of a first conductivity type with a field-effect transistor group of a second conductivity type, said field-effect transistor group of the first conductivity type being connected between a power supply and an output terminal, said field-effect transistor group of the second conductivity type being connected between ground and said output terminal; said logic circuit comprising: a first diode connected between said power supply and said output terminal to provide an inverse bias; and a second diode connected between said ground and said output terminal to provide an inverse bias; wherein, when seen from a direction perpendicular to a first substrate having the logic circuit formed thereon, a projection plane of a diffusion layer region of the first diode includes projection planes of respective drain diffusion layer regions of transistors included in said field-effect transistor group of the second conductivity type; and the first substrate having respective drain diffusion layer regions of said transistors included in said field-effect transistor group of the second conductivity type being present therein is disposed separated from a second substrate having said diffusion layer region of the first diode being present therein; and wherein, when seen from the direction perpendicular to the substrate having said logic circuit formed thereon, a projection plane of a diffusion layer region of the second diode includes projection planes of respective drain diffusion layer regions of transistors included in said field-effect transistor group of the first conductivity type; and the first substrate having respective drain diffusion layer regions of said transistors included in said field-effect transistor group of the first conductivity type being present therein is disposed separated from the second substrate having said diffusion layer region of the second diode being present therein.