5.20 An NMOS transistor, operating in the linear-resistance region with vDS = 50 mV, is found to conduct 50 μA for vGS = 0.8 V and 100 μA for vGS = 1.2 V. Whatis the apparent value of threshold voltage Vt? If kn′ = 500 μA/V2, what is the device W/L ratio? What current would you expect to flow with vGS = 1 V and vDS = 0.2 V? If the device is operated at vGS = 1 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?