Patent ID: 6531720
Filing Date: 2003-03-11
Classification: H01L

Abstract:
A heterojunction bipolar transistor, comprising:a collector; an emitter; an intrinsic base; and an extrinsic base having a first extrinsic base regions and a second extrinsic base regions, wherein each of said first extrinsic base regions and said second extrinsic base regions are located on respective sides of said intrinsic base, and wherein said first extrinsic base regions are closer to said emitter than said second extrinsic base regions, wherein said first extrinsic base regions are farther away from said collector than said second extrinsic base regions, wherein said first extrinsic base regions have greater widths than said second extrinsic base regions, and wherein said first and said second extrinsic base regions have respective substantially parallel edges oriented in respective directions substantially normal to their widths, each of said edges of said second extrinsic base regions being separated from said collector by a greater distance than said edges of said first extrinsic base regions.