Patent ID: 6972476
Filing Date: 2005-12-06
Classification: H01L,Y02E,Y10S

Abstract:
1. A diode string structure, comprising: a substrate of a first conductive type; a diode string having a starting end and a terminal end on the substrate; a first well region of a second conductive type located within the substrate; a first doped region of the second conductive type located within the first well region, wherein the first doped region is heavily doped and forms the starting end of the diode string and adjacent to the surface of the substrate, and the first doped region is coupled to a drain terminal; and at least two diode structures located within the first well region, wherein one of the diode structures is a starting diode structure adjacent to the starting end of the diode string, one of the diode structure is an ending diode structure forming the terminal end of the diode string, and each of the diode structures comprises: wherein shallow trench isolations regions are formed adjacent to the surface of the substrate, so as to respectively separate immediately neighboring regions of said first, second and third regions.