Patent ID: 7994611

Claim:
A bipolar transistor comprising: a base having a top surface and extrinsic base regions, said extrinsic base regions including a heavily doped implanted region; an emitter window stack situated between said extrinsic base regions, the emitter window stack comprising only a base oxide layer situated on said top surface of said base and an antireflective coating layer situated on and in contact with said base oxide layer; an emitter situated over said top surface of said base, wherein said emitter is situated between said extrinsic base regions of said base, wherein said emitter is situated over and in direct contact with a top surface of the emitter window stack and said emitter is situated over and in direct contact with side surfaces of the emitter window stack; a collector situated below said base and said heavily doped implanted region; a buried layer underlying and in contact with said collector, said buried layer having a same conductivity type as said collector; a collector sinker situated above and in contact with said buried layer, said collector sinker being electrically connected to said collector by said buried layer; wherein said bipolar transistor has reduced process steps.