Patent ID: 7239007
Filing Date: 2007-07-03
Classification: H01L

Abstract:
1. A device structure comprising: an isolation region completely surrounding a single continuous collector region of only a single transistor; a discontinuous base region located within said collector region, said discontinuous base region comprising plural divided sub-base regions spatially separated from each other; a base electrode contact region located within the base region, said base electrode contact region comprising plural divided base electrode contact sub-regions spatially separated from each other; and an emitter region located within the discontinuous base region, said emitter region comprising plural divided sub-emitter regions spatially separated from each other, said plural divided sub-emitter regions being also spatially separated, at least in a plan view first direction, from the base electrode contact region, said plural divided sub-emitter regions having respective sub-emitter lengths defined in a plan view second direction perpendicular to said first direction, and a total sum of said respective sub-emitter lengths corresponds to a predetermined effective emitter length defined in said second direction for an intended emitter current from said emitter region, wherein said respective sub-emitter lengths are within a range of 0.8 times to 1.2 times of a predetermined basic emitter length defined as a unit emitter length for a basic emitter current as a unit emitter current, wherein said plural divided sub-emitter regions are aligned in said second direction as a second-direction grouping, wherein the plural base electrode contact sub-regions are aligned in said second direction and in parallel to said second-direction grouping of said plural divided sub-emitter regions, and said plural divided sub-emitter regions have a uniform distance from said plural base electrode contact sub-regions over said second direction, and wherein said plural divided sub-base regions are aligned in said second direction, and a set of one of said plural base electrode contact sub-regions and one of said plural divided sub-emitter regions is provided in each of said plural divided sub-base regions.