An NMOS operating with VGS = 1 V, and Vt = 0.5 V exhibits a linear resistance rDS = 1 kΩ when VDS is very small. What is the value of the current iD obtained when VDS is increased to 0.5 V ? and 1 V ? 0.25 mA, 0.25 mA 0.16 mA, 0.25 mA None of them 0.25 mA, 0.16 mA 0.16 mA, 0.16 mA