For the cascode amplifier below, VDD=5V, I1 is an ideal current source with 50 A. Ri is used for DC biasing purpose and it has a very large value. Transistor parameters are given as ,Cox-50 A/V?, 1=0.03V-!, VTHN=1V, VTHP-1V. Cl is also a big capacitor which provides de blockage. Values of R1 and Ci won't affect your theoretical calculations and will be used for simulation purpose. Transistor geometries can be seen in Figure below. VDD 11 50p R1 Vout 1G M2 1=500n w-20u VBIAS =500n we5u M1 C1 10p VAC AC 1 a) Calculate DC operating points. (All currents and voltages) b) Calculate small signal AC gain. c) Determine VBIAS value to keep all the transistors in saturation region.