Patent ID: 8357932

Claim:
A structure comprising, from bottom to top: a first line level structure including a first array of first metal pads, wherein a first lateral extension portion protrudes from each of said first metal pads; a first via level structure including first metal vias, wherein each of said first metal vias contacts one of said first lateral extension portions; a second line level structure including a second array of second metal pads, wherein a second lateral extension portion protrudes from each of said second metal pads, each of said lateral extension portion contacts one of said first metal vias, and a second metal pad among said second array of said second metal pads which vertically overlies a first metal pad among said first array of said first metal pads is electrically isolated from said first metal pad and is electrically connected to another first metal pad that does not directly underlie said second metal pad; a first line level test structure including metallic structures located in a same level as said first line level structure, said first line level test structure including first metal lines electrically connected to two of said first metal pads; and a second line level test structure including metallic structures located in a same level as said second line level structure, said second line level test structure including second metal lines electrically connected to two of said second metal pads.