Patent ID: 7514754
Filing Date: 2009-04-07
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a substrate of a first conductive type; a first epitaxial layer of the first conductive type, disposed on the substrate; a second epitaxial layer of a second conductive type, disposed on the first epitaxial layer; a first sinker of the first conductive type, disposed in the first epitaxial layer and the second epitaxial layer, and extending from the substrate to an upper surface of the second epitaxial layer and defining a first area from the first epitaxial layer and the second epitaxial layer; a second sinker of the second conductive type, disposed in the second epitaxial layer extending from the first epitaxial layer to the upper surface of the second epitaxial layer and defining a second area from the second epitaxial layer of the first area; an active device, disposed in the second area; a first buried layer of the first conductive type, disposed between the first epitaxial layer and the substrate in the first area, and connected to the first sinker; and a second buried layer of the second conductive type, disposed between the second epitaxial layer and the first epitaxial layer in the second area, and connected to the second sinker.