Patent ID: 7923809

Claim:
A semiconductor device comprising: a semiconductor substrate; a diffusion layer formed on the semiconductor substrate; at least two wiring layers formed opposite to each other over the semiconductor substrate; signal lines for transmitting a signal maintaining a predetermined voltage, each of the signal lines being formed in corresponding one of the two wiring layers; shield lines fixed to a constant voltage to shield the signal lines, each of the shield lines being formed adjacent to at least one of the signal lines in the corresponding one of the two wiring layers; and a gate electrode formed over the semiconductor substrate via an insulation film, wherein at least one of the signal lines formed in a lower wiring layer of the at least two wiring layers is electrically connected to the gate electrode opposed in a stacking direction, wherein the signal lines include a first signal line formed in an upper wiring layer of the at least two wiring layers and a second signal line formed in said lower wiring layer, and the shield lines include a first shield line formed in said upper wiring layer and a second shield line electrically connected to the diffusion layer and formed in said lower wiring layer.