Patent ID: 7327012
Filing Date: 2008-02-05
Classification: H01L

Abstract:
1. An integrated circuit comprising: a substrate of a first conductivity type; a first bipolar transistor in a surface of the substrate, having a collector of a second conductivity type opposite the first conductivity type extending from the surface into the substrate, a base in the collector and an emitter in the base; a second bipolar transistor in the surface of the substrate, having a collector of the second conductivity type extending from the surface into the substrate, a base in the collector and an emitter in the base; a maximum impurity concentration of the second transistor's collector extending laterally greater than the second transistor's emitter and substantially the lateral dimensions of the second transistor's base; and the maximum impurity concentration of the second transistor's collector being greater than a maximum impurity concentration of the first transistor's collector and a collector-base breakdown voltage of the second transistor being less than a collector-base breakdown voltage of the first transistor.