Patent ID: 7615826
Filing Date: 2009-11-10
Classification: H01L

Abstract:
1. An electrostatic discharge (ESD) protection semiconductor structure with adjustable multi-trigger voltage, comprising: a second type ion-doped layer with a plurality of ESD protection devices formed thereon, each of the ESD protection devices comprising: a first type ion-doped well, disposed in the second type ion doped layer; a first first-type ion heavily doped region, disposed in the second type ion doped layer, formed separately from the first type ion doped well; a second type ion heavily doped region, disposed in the second type ion doped layer, formed separately from the first type ion doped well; a first electrode, connected to the first first-type ion heavily doped region and the second type ion heavily doped region; a second electrode; a plurality of second first-type ion heavily doped region, disposed in the first type ion doped well and next to a boundary of the first type ion doped well, wherein a distance between an edge of one of the plurality of the second first-type ion heavily doped region, which is the closest to the boundary of the first type ion doped well, and the boundary of the first type ion doped well is adjustable; and a plurality of third first-type ion heavily doped region, disposed in the first type ion doped well between the second first-type ion heavily doped regions, wherein the third first-type ion heavily doped regions are connected to the second electrode respectively.