(Solved): 5. A common emitter bipolar junction transistor circuit is shown in Figure Q5. It has a fixed va ...

5. A common emitter bipolar junction transistor circuit is shown in Figure Q5. It has a fixed $?$ value of 400 . If the transistor is to be used as a switch, (a) Calculate the minimum $V_i$ needed to turn the transistor $\mathrm{ON}$. [9 marks] (b) What is the value of $V_0$ when the transistor is fully ON? [2 marks] (c) What is the value of ${\mathrm{V}}_0$ when the transistor is OFF? [2 marks] (d) What is the value of ${\mathrm{I}}_{\mathrm{E}}$ when the transistor is fully ON? [2 marks] Figure Q5