Patent ID: 9130005
Filing Date: 2015-09-08
Classification: H01L

Abstract:
1. An apparatus comprising: a first trench element isolation film formed over a p-type semiconductor substrate; a second trench element isolation film formed over the semiconductor substrate; a first well formed by implanting a p-type impurity into the semiconductor substrate; a second well formed by implanting an n-type impurity into the semiconductor substrate; an emitter formed by implanting the n-type impurity into an emitter region between the first trench element isolation film and the second well; a collector formed by implanting the n-type impurity into a collector region between the first well and the second trench element isolation film; a first base formed by implanting the p-type impurity into a first base region isolated from the emitter region by the first trench element isolation film; a second base formed by implanting the p-type impurity into a second base region between the emitter region and the second well; and a third well formed by implanting the p-type impurity into the first well to surround the second base region; and a fourth well formed below the collector region and the second trench element isolation film by implanting the n-type impurity into the second well.