Patent ID: 7902630

Claim:
An isolated bipolar transistor formed in a semiconductor substrate of a first conductivity type, the substrate not comprising an epitaxial layer, the isolated bipolar transistor comprising: a floor isolation region of a second conductivity type opposite to the first conductivity type submerged in the substrate; a first filled trench extending downward from a surface of the substrate at least to the floor isolation region, the first filled trench comprising a dielectric material, wherein the floor isolation region and the first filled trench together enclose an isolated pocket of the substrate, an emitter region of the second conductivity type located in the isolated pocket adjacent a surface of the substrate; a base region of the first conductivity type located in the isolated pocket adjacent the emitter region, the base region comprising a base contact region, the base contact region having a higher doping concentration than a remaining portion of the base region; a dielectric-filled trench extending downward from the surface of the substrate and separating the emitter region and the base contact region; and a collector region of the second conductivity type, the collector region comprising the floor isolation region and being located adjacent the base region.