(a) For a pnp bipolar junction transistor: i) Sketch the energy band diagram for the transistor. Indicate in your diagram the doping levels(high, low or intermediate), the majority and minority

carrier types in each layer and the approximate relative widths of the layers. (8 marks)ii) With a common emitter bias applied, indicate the directions of all charge carrier flows across the junctions. (b) In the following circuit, the transistor has a current gain Bdc=350:R2 R1 has a resistance of X times 100 k2 and R2 has a resistance of Y kQ. Assuming a voltage drop of 0.7 V across the p-n junctions, calculate i) The base current Ip ii) The collector current Ic iii) The collector-emitter voltage VCE iv) The power dissipated. v) How would you increase the power rating of a transistor?