Assume the following unless stated otherwise for a 0.18 μm CMOS process: VDD = 3.3 V, Lmin = 0.18 μm Vtn = 0.5 V or −1 V (choose accordingly), Vtp = −0.5 V μnCox = 390 μA/V2, μpCox = 90 μA/V2 Consider a CMOS inverter with a load of Ctot = 250 fF. a) Calculate all five voltages of the voltage transfer characteristic for kn = kp. b) Find the noise margins and the area of the inverter. c) Make a qualitative evaluation of the inverter regarding its static performance. d) Calculate the rise time τr using the RC method