Patent ID: 7414298

Claim:
A bipolar junction transistor comprising: in a substrate, a first isolation structure spaced apart from a second isolation structure; an epitaxial base layer formed in the substrate; an emitter stack disposed immediately above the epitaxial base layer above the substrate and between the first isolation structure and the second isolation structure, wherein the emitter stack has an emitter stack perimeter; a recess disposed immediately adjacent to the emitter stack and disposed between the emitter stack and the first isolation structure, wherein the recess exposes a collector tap having a collector tap perimeter, wherein the emitter stack and the recess share a boundary, and wherein the emitter stack perimeter and the collector tap perimeter share a co-linear boundary; an emitter cut provided at the bottom of said emitter stack and immediately or top of an intrinsic base structure formed in epitaxial base layer of the substrate; and a collector structure disposed in the substrate below the emitter stack, wherein the collector structure is coupled to the collector tap through the substrate.