Patent ID: 7808056

Claim:
A semiconductor integrated circuit device comprising: a first field-effect transistor and a second field-effect transistor, each of the first field-effect transistor and the second field-effect transistor having a gate electrode formed as a ring shape, a drain diffusion layer formed inside the gate electrode and a source diffusion layer formed outside the gate electrode; a substrate potential diffusion layer or a well potential diffusion layer disposed to contact each of the source diffusion layers of the first and the second field-effect transistors of the same conductivity type, the substrate potential diffusion layer or the well potential diffusion layer being formed with a semiconductor of a different conductivity type from the source diffusion layer; a first input line connected to the gate electrode of the first field-effect transistor; a second input line connected to the gate electrode of the second field-effect transistor, wherein: the second input line is different from the first input line, the substrate potential diffusion layer or the well potential diffusion layer is formed between the source diffusion layer of the first field-effect transistor and the source diffusion layer of the second field-effect transistor, and no isolation insulating film is disposed between the source diffusion layer of the first field-effect transistor and the source diffusion layer of the second field-effect transistor, wherein the gate electrode of the first field-effect transistor is electrically isolated from the gate electrode of the second field-effect transistor.