A certain pnp BJT has an emitter area of (25 m) 3 (50 m), and its base and emitter doping concentrations are NDB 5 1017/cm3 and NAE 5 1019/cm3 . (a) If Dn 5 3 cm2 /s, Dp 5 8 cm2 /s, WE 5 WB 5 1 m, and...

A certain pnp BJT has an emitter area of (25 m) 3 (50 m), and its base and emitter doping concentrations are NDB 5 1017/cm3 and NAE 5 1019/cm3 . (a) If Dn 5 3 cm2 /s, Dp 5 8 cm2 /s, WE 5 WB 5 1 m, and p 5 100 ns, fi nd Is and F. (b) Repeat part (a) if WB is lowered to 0.5 m. (c) Repeat (a) if WE is raised to 2 m. In both cases, comment on your fi ndings.