The depletion nMOSFET M1 of Fig. P4.18 operates as a CS amplifi er, and the nMOSFET M2 as an active load. (a) If k 5 100 A/V2 , Vt XXXXXXXXXXV,  5 1y(25  V), 5 0.4 V1y2 , and u2 pu 5 0.6 V. specify...

The depletion nMOSFET M1 of Fig. P4.18 operates as a CS amplifi er, and the nMOSFET M2 as an active load. (a) If k 5 100 A/V2 , Vt 0 5 21.0 V,  5 1y(25  V), 5 0.4 V1y2 , and u2 pu 5 0.6 V. specify WyL ratios for the two devices so that with VDD 5 5 V the output node is biased at VO 5 3.0 V and the FETs draw ID 5 50 A. (b) Find Ro and a 5 voyvi . (c) Estimate vO(min) and vO(max), the lower and upper limits of the linear region of operation. (d) Suppose M2’s body is lifted off ground and tied to the source, and W2yL2 is made equal to W1yL1. If VDD is adjusted so as to leave VO unchanged at 3.0 V, what is the new value of VDD, and how do the values of Ro and a change? Comment on your findings.