Patent ID: 6995453
Filing Date: 2006-02-07
Classification: H01L

Abstract:
1. An integrated circuit comprising: a substrate; an epitaxial layer over the substrate, the epitaxial layer having a predetermined doping concentration; a transistor formed in the epitaxial layer; and an isolation region extending through the epitaxial layer such that a portion of the epitaxial layer in which the transistor is formed is electrically isolated from other portions of the epitaxial layer, the epitaxial layer having a conductivity type opposite that of the substrate and the isolation region, the isolation region having a lower doping concentration than the predetermined doping concentration of the epitaxial layer such that a depletion region formed as a result of a reverse biased junction between the epitaxial layer and the isolation region extends a farther distance into the entire isolation region and the substrate than into the epitaxial layer.