Patent ID: 8736013
Filing Date: 2014-05-27
Classification: H01L

Abstract:
1. An apparatus, comprising: an insulating element abutting a surface area of a silicon substrate; an n-well region disposed in the silicon substrate; a p-well guard ring region disposed in the silicon substrate between the n-well region and the insulating element; and a conductive layer disposed on the surface area of the silicon substrate, the conductive layer having a middle portion and an edge portion, the middle portion of the conductive layer forming an n-type rectifying contact with the n-well region of the silicon substrate, the middle portion of the conductive layer and the n-well region forming an n-type Schottky diode, the edge portion of the conductive layer forming a p-type rectifying contact with the p-well guard ring region, the p-type rectifying contact abutting the n-type rectifying contact, the p-type rectifying contact extending from the n-type rectifying contact and abutting the insulating element, the edge portion of the conductive layer and the p-well guard ring region forming a p-type guard ring Schottky diode electrically in parallel with the n-type Schottky diode; an anode structure disposed over the surface area of the silicon substrate in electrical contact with the conductive layer, the anode structure forming a first terminal of the p-type guard ring Schottky diode electrically in parallel with the n-type Schottky diode.