Calculate DC biasing (20 points), of the following circuits. |Vth| = 0.5 V, λ = 0, μCoxWL = 0.2 A/V2 for all devices. DC biasing means the biasing currents and the output voltages. If we keep the currents as calculated and try to minimize the vdd, what would be the the lowest vdd for the circuits. Assume PMOS's parameters are exactly the same as the NMOS (20 points).