Punch Through Injection Structures for low voltage oscillation and low noise amplification

Two punch through injection structures are proposed, the first one for low voltage oscillation, the second one for low noise amplification to achieve the first objective N+ P II N+ structures have been realized which gave interesting results. The second objective has been achieved with a P+ N- N P+ structure which can give a theoretical minimum noise figure of about 5 db. Because of technological difficulties this structure has not been realized yet.