Determine gain for each of four amplifiers having current source load. Consider rO's each amplifier.
a) Refer to the multi-transistor MOSFET current source in Figure 3 below. It is given that V+ = 5V, V− = 0. For the transistors: kn′ = 40 uA/V2, VTN = 1V, and λ = 0. Design the current source such that IREF = 0.25mA, Io1 = 0.10mA, Io2 = 0.5mA and VDS2 (sat) = 0.85 V. Calculate all VGS voltages of the transistors. Figure 3 b) If λ = 0.02V-1, calculate IO2 when VDS2 = 3 V. Use relevant values obtained for Figure 3 in part (a).