Patent ID: 7994609
Filing Date: 2011-08-09
Classification: H01L

Abstract:
1. A capacitor in an integrated circuit (“IC”) comprising: a core capacitor portion having a first plurality of conductive elements electrically connected to and forming a first part of a first node of the capacitor formed in a first conductive layer of the IC and a second plurality of conductive elements electrically connected to and forming a first part of a second node of the capacitor formed in the first conductive layer, the first plurality of conductive elements alternating with the second plurality of conductive elements in the first conductive layer, and a third plurality of conductive elements electrically connected to and forming a second part of the first node formed in a second conductive layer adjacent to the first conductive layer, at least portions of some of the second plurality of conductive elements overlying and vertically coupling to at least portions of some of the third plurality of conductive elements; a shield capacitor portion having a fourth plurality of conductive elements formed in at least the first conductive layer of the IC, the second conductive layer of the IC, a third conductive layer of the IC, and a fourth conductive layer of the IC, the first conductive layer and the second conductive layer each being between the third conductive layer and the fourth conductive layer, the shield capacitor portion being electrically connected to and forming a second part of the second node of the capacitor and surrounding the first plurality of conductive elements and the third plurality of conductive elements; and a reference shield electrically connected to a reference node of the IC other than the second node of the capacitor, the shield capacitor portion being disposed between the reference shield and the core capacitor portion.