Patent ID: 8916951
Filing Date: 2014-12-23
Classification: H01L

Abstract:
1. A lateral bipolar transistor, comprising: a semiconductor substrate of a first conductivity type; a first buried layer of the first conductivity type and a second buried layer of a second conductivity type both formed on the substrate, the second conductivity type being opposite the first conductivity type; one or more epitaxial layers of the second conductivity type formed successively on the substrate, each epitaxial layer including two or more buried layers of the first conductivity type formed therein and positioned above and separated from the second buried layer, the buried layers formed in one epitaxial layer being in vertical alignment with the buried layers formed in an adjacent epitaxial layer; and a last epitaxial layer of the second conductivity type formed on the last one of the one or more epitaxial layers, the last epitaxial layer having at least first and second diffusion regions of the first conductivity type formed therein, each of the first and second diffusion regions being in vertical alignment with a respective one of the buried layers formed in the last one of the one or more epitaxial layers, wherein the first diffusion region and a first set of the buried layers formed in the one or more epitaxial layers are in vertical alignment to form a contiguous diffusion region of the first conductivity type and functions as an emitter region, and the second diffusion region and a second set of the buried layers formed in the one or more epitaxial layers are in vertical alignment to form a contiguous diffusion region of the first conductivity type and functions as a collector region, a base region being formed in the one or more epitaxial layers and the last epitaxial layer between the emitter and collector regions.