Question 1: Consider the circuits shown in Figure 1 below and answer all question below. VDD VDD Ro IREF RF lo Circuit Parameters M3 Vo IREF RF Ro lo M₁ (W/L)1 Mz M₁ (W/L)1 (a) (b) Figure 1 M2 VDD =5V IREF = 0.25mA lo=0.1 mA VGS1 = 2 V VGS3 = 1.5 V Transistor Parameters K₁' = 50 μA/V² VTN=1V 2=0 λ=²=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., 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?