A certain npn BJT has NDE 5 1019/cm3 , NAB 5 1017/cm3 , and NDC 5 1015/cm3 . Moreover, Dp 5 1.8 cm2 /s, Dn 5 18 cm2 /s, and n 5 150 ns. (a) Find WB and WE so that F 5 250 under the constraint IBE 5...

A certain npn BJT has NDE 5 1019/cm3 , NAB 5 1017/cm3 , and NDC 5 1015/cm3 . Moreover, Dp 5 1.8 cm2 /s, Dn 5 18 cm2 /s, and n 5 150 ns. (a) Find WB and WE so that F 5 250 under the constraint IBE 5 IBB. (b) With reference to find the distance between the B-E and the B-C metallurgical junctions, as well as the distance between the B-E metallurgical junction and the E electrode, given that VBE 5 700 mV and VBC 5 22.0 V. Assume grading coeffi cients of 0.5 for both junctions.