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5.21 An NMOS transistor, operating in the linear-resistance region with vDS = 50 mV, is found to conduct 25 μA for v GS = 1 V and 50 μA for vGS = 1.5 V. What is the apparent value of threshold voltage Vt? If kn = 50 μA/V2, what is the device W/L ratio? What current would you expect to flow with v GS = 2 V and vDS = 0.1 V? If the device is operated at v GS = 2 V, at what value of vDS will the drain end of the MOSFET channel just reach pinch-off, and what is the corresponding drain current?