1. A source-follower circuit using NMOS transistors is constructed following the pattern

shown in Fig. 1. All three transistors used are identical, with Vt = 0.5 V and μn Cox W/L =

20 mA/V²; Vcc=2.5 V, R = R₁ =1 kn. For linear operation, what are the upper and lower

limits of the output voltage and the corresponding inputs?