The paper is devoted to optimization of SiGe-base HBT with respect to operation speed by means of numerical simulation. The influence of design parameters on f(T) is studied.
SiGe-base HBTs with Gaussian doping distribution are modeled including the effect of the drift field and variable Ge concentration in the base on the diffusion coefficient. Two different Ge distributions in the base are considered: a triangular one and a box one.
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