In the current mirror shown in fig. 2, all the MOSFETs are to be operated in saturation region with overdrive voltage of 0.2 V. Take μpCox = 200 μA/V2 (a) Find the IREF value at which this current mirror works best if R = 20 kΩ. (b) Design the current mirror to obtain IO = 20 μA. (c) What is the maximum voltage possible at node X for this current mirror to work well, if Vdd = 1.8 V?