Patent ID: 9385184
Filing Date: 2016-07-05
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising: a substrate; a first well having a first conductive type and extending down from a surface of the substrate; a diffusion region doped with impurity of the first conductive type and extending down from a surface of the first well; and a plurality of active devices formed within the diffusion region, and the active devices arranged separately from each other, wherein the active devices are electrically isolated from each other by the diffusion region, and the conductive guarding structure comprises: a middle portion; a first guarding portion, adjoining one side of the middle portion for defining a first region at the diffusion region, wherein the first region is enclosed by the first guarding portion and the middle portion; and a second guarding portion, opposite to the first guarding portion and adjoining another side of the middle portion for defining a second region at the diffusion region, wherein the second region is enclosed by the second guarding portion and the middle portion.