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Unformatted text preview: 1 C/cm 3 . 3. A ntype MOSFET ( L = 1 m, t ox = 15 nm, V T = 1 V and n = 300 cm 2 /Vsec) must provide a current of 20 mA at a drainsource voltage of 0.5 Volt and a gatesource voltage of 5 Volt. How wide should the gate be? 4. Consider an nchannel MOSFET with n+ polySi gate, T oxe = 10 nm, and body doping N A =5x10 16 cm3 . Assume W=10 m, V GS  V T = 3V, and sat (critical electric field for velocity saturation) = 2x10 4 V/cm. a) Find V Dsat for i. L = 1 m. Is this a longchannel device or a shortchannel device? ii. L = 0.1 m. Is this a longchannel device or a shortchannel device? For the questions below, assume L = 0.5um. b) Without considering velocity saturation, what is I DS at V DS = 1 V? c) What is I DS at V DS = 1 V with velocity saturation? d) Calculate the subthreshold swing, S....
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 Spring '11
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