Decoupling integrated circuit

A decoupling integrated circuit comprising:

• a substrate including a first active region and a second active region;
• the first active region extending in a first direction;
• the second active region extending in the first direction, and being spaced apart from the first active region in a second direction, the second direction intersecting the first direction;
• a first power rail including a first power rail horizontal extension and a first-1 power rail protrusion and configured to receive a first power supply, the first power rail horizontal extension being apart from the first active region in a third direction opposite to the second direction and extending in the first direction, the first-1 power rail protrusion protruding from the first power rail horizontal extension in the second direction;
• and
• a second power rail including a second power rail horizontal extension and a second-1 power rail protrusion and configured to receive a second power supply different from the first power supply, the second power rail horizontal extension being apart from the second active region in the second direction and extending in the first direction, the second-1 power rail protrusion protruding from the second power rail horizontal extension in the third direction,
• wherein the first-1 power rail protrusion overlaps the first active region,
• the first-1 power rail protrusion is electrically connected to the first active region by a first contact structure and is electrically isolated from the second active region,
• the second-1 power rail protrusion is electrically connected to the second active region by a second contact structure and is electrically isolated from the first active region,
• the second-1 power rail protrusion overlaps the second active region,
• the first-1 power rail protrusion and the second-1 power rail protrusion are spaced apart in the first direction, and
• the first-1 power rail protrusion and the second-1 power rail protrusion at least partially overlap each other in the first direction to provide a first decoupling capacitor.

A decoupling integrated circuit comprising:

• a substrate including a first active region and a second active region;
• the first active region extending in a first direction;
• the second active region extending in the first direction, and being spaced apart from the first active region in a second direction, the second direction intersecting the first direction;
• a first power rail including a first power rail horizontal extension and a first-1 power rail protrusion and configured to receive a first power supply, the first power rail horizontal extension being apart from the first active region in a third direction opposite to the second direction and extending in the first direction, the first-1 power rail protrusion protruding from the first power rail horizontal extension in the second direction;
• and
• a second power rail including a second power rail horizontal extension, a second-1 power rail protrusion and a second-2 power rail protrusion and configured to receive a second power supply different from the first power supply, the second power rail horizontal extension being apart from the second active region in the second direction and extending in the first direction, the second-1 power rail protrusion protruding from the second power rail horizontal extension in the third direction, the second-2 power rail protrusion protruding from the second power rail horizontal extension in the third direction and being spaced apart from the second-1 power rail protrusion in the first direction,
• wherein the first-1 power rail protrusion overlaps the first active region,
• the first-1 power rail protrusion is electrically connected to the first active region by a first contact structure and is electrically isolated from the second active region,
• the second-1 power rail protrusion is electrically connected to the second active region by a second contact structure and is electrically isolated from the first active region,
• the second-1 power rail protrusion overlaps a part of the second active region and is spaced apart from the first-1 power rail protrusion in the second direction to provide a first decoupling capacitor between the first-1 power rail protrusion and the second-1 power rail protrusion, and
• the second-2 power rail protrusion overlaps the second active region, the first-1 power rail protrusion and the second-2 power rail protrusion are spaced apart in the first direction, and the first-1 power rail protrusion and the second-2 power rail protrusion at least partially overlap each other in the first direction to provide a second decoupling capacitor.