Question 1: Consider the circuits shown in Figure 1 below and answer all question below. VDD V VDD IREF www Vo IREF RF Ro Io M1 (W/L)1 M2 M1 (W/L)1 (a) (b) Figure 1 M3 M2 Ro Circuit Parameters VDD = 5 V IREF=0.25mA Io = 0.1 mA VGS1 = 2 V VGS3 = 1.5 V Transistor Parameters Kn' = 50 μA/V² VTN = 1 V 2=0 21=2²=0.01V-1 a) Determine RF. b) Determine the ratio of the aspect ratios (W/L)s of the transistors M₁ and M2. i.e., W c) Determine the output resistance R. of the current miror. d) Determine the minimum value of Vo so that all transistors stay in SAT region?