In common emitter transistor as shown in Fig., the `V_(BB)` supply can be varied from 0 V to 5.0V. The Si. Transistor has `beta_(ac)=250` and `R_(B)=100kOmega, R_(c)=1k Omega,V_(C C)=5.0V`. Assume that when the transistor is saturated, `V_(CE)=0V` and `V_(BE)=0.8V`. Calculate the minimum base current, for which the transistor will reach saturation. Hence, determine `V_(i)` when the transistor is 'switched on' find ranges of `V_(i)` for which the transistor is switched off and switched on.

Explanation

(a)`20 mu A`
(b)2.8 V
(c )Switched off between 0 V and 0.6 V
Switched on between 2.8 V and 5 V