Patent ID: 8648443
Filing Date: 2014-02-11
Classification: H01L

Abstract:
1. A bipolar transistor having a first surface, and comprising: a base of a first conductivity type; a collector of a second, opposite, conductivity type in contact with the base; an emitter of the second conductivity type extending into the base at the first surface and having a first lateral width; a base contact of the first conductivity type extending into the base at the first surface and laterally spaced apart from the emitter; a further region of the second conductivity type located laterally between the emitter and the base contact and formed in the base proximate the first surface, the further region extending from the base contact toward the emitter and having a peak dopant concentration near the first surface less than the doping concentration of the emitter; and a yet further region of the second conductivity type and a second lateral width smaller than the first lateral width.