*5.43 All the transistors in the circuits shown in Fig. P5.43 have the same values of Vt , k, W/L, and λ. Moreover, λ is negligibly small. All operate in saturation at ID = I and VGS = V DS = 1 V. Find the voltages V1, V2, V3, and V4. If Vt = 0.5 V and I = 0.1 mA, how large a resistor can be inserted in series with each drain while maintaining saturation? If the current source I requires at least 0.5 V between its terminals to operate properly, what is the largest resistor that can be placed in series with each MOSFET source while ensuring saturated-mode operation of each transistor at ID = I? In the latter limiting situation, what do V1, V2, V3, and V4 become?