SiGe Profile Optimization for Improved Cryogenic Operation at High Injection
Yan Cui, Guofu Niu, Yun Long Shi, Chendong Zhu, Laleh Najafizadeh, John D. Cressler, Alvin J Joseph · Proceedings of the ... Bipolar/BiCMOS Circuits and Technology Meeting/Proceedings of the ... BipolarBiCMOS Circuits and Technology Meeting · 2006
This paper explores SiGe profile optimization for improved cryogenic operation at high injection. Through analyzing distributive transit time profiles, the bottle neck limiting high injection fTis identified and then eliminated in an optimized profile design. The fabricated profile indeed shows considerably improved fTand beta at high injection