In MOS IC technology a voltage divider is usually implemented via a series combination of diodeconnected FETs in order to avoid using resistors, which are undesirable in IC technology. An example is...

In MOS IC technology a voltage divider is usually implemented via a series combination of diodeconnected FETs in order to avoid using resistors, which are undesirable in IC technology. An example is shown in Fig. P4.3. (a) Assuming k9 5 50 A/V2 , Vt 0 5 0.5 V, 5 0.4 V1y2 , 5 1y(25 V), and u2 pu 5 0.6 V, specify suitable WyL ratios for M1 and M2 so that with VDD 5 3 V the circuit gives V 5 VDDy2 while dissipating PD 5 100 W. (b) Find V and PD if VDD is lowered to 2 V.