BIPOLAR DEVICES;
TRANSISTORS;
SEMICONDUCTOR DEVICES AND MATERIALS;
D O I:
10.1049/el:19930178
中图分类号:
TM [电工技术];
TN [电子技术、通信技术];
学科分类号:
0808 ;
0809 ;
摘要:
The results of a theoretical study of the performance of high speed SiGe HBTs is presented. The study includes a group of SiGe HBTs in which the Ge concentration in the base is 20% higher than that in the emitter and collector (i.e. y = x + 0.2). It is shown that the composition dependences of f(T) and the f(max) are non-monotonic. As the Ge composition in the emitter and collector layers is increased, f(T) and f(max) first decrease, then remain constant and finally increase to attain their highest values.