Patent ID: 7446995

Claim:
A symmetrical capacitor, comprising: a first metal layer having a first electrode plate and a second electrode plate formed thereon separated by a predetermined distance; a second metal layer having a first electrode plate and a second electrode plate formed thereon separated by a predetermined distance; a first via hole connects the first electrode plate on the first metal layer and the first electrode plate on the second metal layer, wherein the first electrode plate on the first metal layer and the first electrode plate on the second metal layer are located on the opposite sides of the first metal layer and the second metal layer; and a second via hole connects the second electrode plate on the first metal layer and the second electrode plate on the second metal layer, wherein the second electrode plate on the first metal layer and the second electrode plate on the second metal layer are located on the opposite sides of the first metal layer and the second metal layer; wherein the first electrode plate on the first metal layer and the second electrode plate on the second metal layer are symmetrical, and the second electrode plate on the first metal layer and the first electrode plate on the second metal layer are symmetrical.