A CMOS IC designer is working with nMOSFETs characterized by k9 5 125 A/V2 and 5 (0.04 m)/L V21 . (a) Assuming the designer wants to bias a particular device at ID 5 200 A with VOV 5 0.25 V, what is...

A CMOS IC designer is working with nMOSFETs characterized by k9 5 125 A/V2 and 5 (0.04 m)/L V21 . (a) Assuming the designer wants to bias a particular device at ID 5 200 A with VOV 5 0.25 V, what is the required value of W if L 5 1 m? What is the value of the intrinsic gain aintrinsic 5 gmro? (b) Given that Cox5 2.5 fF/m2 , Lov5 0.1L, and Cgb5 5 fF, what are the values of Cgs, Cgd, and fT? (c) Dissatisfi ed with the estimated value of fT, the designer decides to reduce W to 1 ⁄4 of the value of part (a) so as to reduce Cgs, Cgd and thus raise fT. What is the required VOV to retain the same operating point at ID 5 200 A? What are the new values of aintrinsic, Cgs, Cgd, and fT? Comment on your findings.