(a) Describe the main advantages and disadvantages of single stage operational amplifiers compared to 2-stage types. (b) Explain, with the aid of diagrams, the concept of gain bandwidth product (GBWP) as it applies to an amplifier. (c) Vin 0 8m/Vin VI RI 8miv RICH Vout Figure 1 Figure 1 is the circuit schematic of an uncompensated 2-stage amplifier. Write down the transfer function Vou/Vin and hence sketch the frequency response (i.e. Bode plots of the magnitude and phase responses) of the system. Indicate the position of GBWP on the frequency response plot and describe how the closed- loop stability of the system can be assessed from the (open loop) frequency response. Using the frequency response plots, suggest how the closed loop stability of the system shown in Figure 1 can be improved by the use of compensation.