Patent ID: 6703687
Filing Date: 2004-03-09
Classification: H01L

Abstract:
A bipolar transistor comprising:a collector region including a semiconductor substrate doped with a first conductive dopant; an intrinsic base region low-density doped with a second conductive dopant on said semiconductor substrate, said second conductive dopant being contrary to said first conductive dopant; an extrinsic base region high-density doped with said second conductive dopant on a first portion of the upper surface of said intrinsic base region and formed in a single well with at least two branched lower terminals; an emitter region doped with said first conductive dopant on a second portion of the upper surface of said intrinsic base region, said second portion spaced from said first portion by a designated interval; a collector electrode formed on the lower surface of said semiconductor substrate; an emitter electrode formed on the upper surface of said emitter region; and a base electrode formed on the upper surface of said extrinsic base region.