Patent ID: 7348657
Filing Date: 2008-03-25
Classification: H01L

Abstract:
1. A triple well electrostatic discharge (ESD) network comprising: a substrate of a first conductivity; an insulator region residing on the surface of the substrate; a first region of a second conductivity being partially embedded in the insulator region and the substrate; a second region of the second conductivity being completely embedded in the substrate and partially embedded in the first region; a third region of the second conductivity being partially embedded in the insulator region, the substrate, and the second region; the first, second, and third regions forming a first cathode; a fourth region of the first conductivity being embedded in the insulator region and being located between the first and third regions; a fifth region of the second conductivity type is located between the first and fourth regions, embedded in the insulator, and having its bottom surface abutting an isolation region; a sixth region of the second conductivity type is located between the third and fourth regions, embedded in the insulator, and having its bottom surface abutting the isolation region; the fifth and sixth regions forming a second cathode; and the isolation region forming a metallurgical junction between the fourth, fifth, and sixth regions and the first, second and third regions for the conduction of electrostatic discharge.