Patent ID: 7332741

Claim:
A test structure for testing a path of multidirectional current leakage, wherein there are a first direction and a second direction different from the first direction, said test structure comprising: a first well of a first conductivity in a substrate; a first doped region of said first conductivity in said first well, wherein said first doped region has a first dopant concentration higher than said first well has; a first contact on said first doped region and contacting said first doped region, wherein said first contact has a first portion and a second portion respectively parallel to said first direction and said second direction; a plurality of second doped regions of a second conductivity in said first well and isolated from said first doped region, wherein in a third direction, said second regions are adjacent to each another and isolate said first portion from said second portion; and a plurality of second contacts on said second doped regions, wherein each said second contact is corresponding to each said second doped region.