Calculate the output high voltage, the output low voltage, and hence the voltage swing for a 2:1 and a 4:1 nMOS inverter where the pull-up device is an nMOS depletion mode transistor. VDD is 5 V, Vtn = 1 V, Vtdep = −3 V. Assume that Vin(Hi) = VDD, Vin(Lo) is below Vtn. Why does logic degradation occur at the output?