US Patent 7456447 Semiconductor integrated circuit device

In a semiconductor integrated circuit device, a VDD wiring trace and a GND wiring trace are routed along an N-well and a P-well, respectively, within a substrate. A substrate-bias VDD2 wiring trace is routed in a direction that intersects the VDD wiring trace and GND wiring trace in the same layer thereof and is electrically connected thereto. A P+ diffusion layer is disposed in the N-well in the vicinity of a portion where the wiring directions of the VDD wiring trace and substrate-bias VDD2 wiring trace intersect and is electrically connected to the VDD wiring trace via a contact. An N+ diffusion layer is disposed in the P-well in the vicinity of a portion where the wiring directions of the GND wiring trace and substrate-bias VDD2 wiring trace intersect and is electrically connected to the GND wiring trace via a contact. The P+ diffusion layer is used as a wiring route regarding the VDD wiring trace and the N+ diffusion layer is used as a wiring route regarding the GND wiring trace.