Patent ID: 8445970
Filing Date: 2013-05-21
Classification: H01L

Abstract:
1. A bipolar device formed in an active area of a substrate using a CMOS process, comprising: a common emitter; a first collector laterally spaced from the common emitter in the substrate; a first gate terminal placed on a space between the first emitter and the first collector; a first intrinsic base defined underneath the first gate terminal, forming a first bipolar junction with the common emitter and the first collector; a first extrinsic base placed adjacent to and separated from the first collector, and connected to the first intrinsic base via the substrate; a second collector laterally spaced from the common emitter in the substrate; a second gate terminal placed on a space between the common emitter and the second collector; a second intrinsic base defined underneath the second gate terminal, forming a second bipolar junction with the common emitter and the second collector; a second extrinsic base placed adjacent to and separated from the second collector, and connected to the second intrinsic base via the substrate; and a first divider and second divider separating the first collector and the second collector from the first extrinsic base and the second extrinsic base, respectively, wherein the first divider and the second divider are of a “saddle” shape to define the first extrinsic base and the second extrinsic base by middle portions and edge portions, respectively, in such a way that the middle portions are closer to the first gate terminal and the second gate terminal than their respective edge portions.