Patent ID: 7067887
Filing Date: 2006-06-27
Classification: H01L

Abstract:
1. A high voltage device for an electrostatic discharge protection circuit, comprising: a first type substrate; a first type epitaxial silicon layer disposed in the first type substrate; a first type well disposed in the first type epitaxial silicon layer; a second type well disposed in the first type epitaxial silicon layer, wherein the second type well comprises a second type lightly doped region and a second type heavily doped region, the second type lightly doped region is located next to the first type well and the second heavily doped region is located underneath a portion of the first type well and the second type lightly doped region, wherein the first type well adjoins with the second heavily doped region; a gate structure disposed on a portion of the first type well and the second type lightly doped region; a second type first doped region and a second type second doped region disposed in the second type lightly doped region and the first type well on each side of the gate structure respectively; a first isolation structure disposed in the second type lightly doped region and between the gate structure and the second type first doped region; a first type doped region disposed in the first type well and adjacent to the second type second doped region; and a second isolation structure disposed in the first type well and between the first type doped region and the second type second doped region.