Patent ID: 8791546

Claim:
A bipolar transistor, comprising: a semiconductor substrate having a first surface; a first emitter region of a first conductivity type in the semiconductor substrate having a first emitter region doping concentration; a first base region of a second, opposite, conductivity type in the semiconductor substrate underlying the first emitter region and having a first base region doping concentration, the first base region forming a first PN or NP junction with the first emitter region at a first depth from the first surface; a second emitter region of the first conductivity type in the semiconductor substrate having a second emitter region doping concentration and Ohmically coupled to the first emitter region; a second base region of the second conductivity type in the semiconductor substrate underlying the second emitter region and having a second base region doping concentration greater than the first base doping concentration, the second base region forming a second PN or NP junction with the second emitter region at a second depth from the first surface less than the first depth; and a buried layer collector region of the first conductivity type in the substrate underlying the first surface and laterally spaced a third distance from the first emitter region.