In Fig. P4.20 the source follower M1 is biased by the current sink M2. Let k9 5 100 A/V2 , 5 1y(15 V), 5 0.4 V1y2 , and u2 pu 5 0.6 V. Moreover, let M1 have Vt 0 5 0.5 V and let M2 have Vt 0 5 21.0 V....

In Fig. P4.20 the source follower M1 is biased by the current sink M2. Let k9 5 100 A/V2 , 5 1y(15 V), 5 0.4 V1y2 , and u2 pu 5 0.6 V. Moreover, let M1 have Vt 0 5 0.5 V and let M2 have Vt 0 5 21.0 V. (a) Specify WyL ratios for the two devices to bias the output at VO 5 22 V and the FETs at ID 5 300 A. (b) Find Ro and voyvi .