5.13 An n-channel device has = 400 μA/V2, Vt = 0.5 V, and W/L = 20. The device is to operate as a switch for small vDS, utilizing a control voltage vGS in the range 0 V to 1.8 V. Find the switch closure resistance, rDS, and closure voltage, vDS, obtained when vGS = 1.8 V and iD = 0.2 mA. If μp 0.25 μn, what must W/L be for a p-channel device that provides the same performance as the n-channel device in this application?
96.2 Ω, 19.2 mV; 80
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