3. A particular n-channel MOSFET has the following specifications: kn\'7x103 A/V

Question

3. A particular n-channel MOSFET has the following specifications: kn'7x103 A/V7 and Vr-1V. The width, W, is 10 um and the length, L, is 2 um. a) If VGs = 0.1V and VDs = 0.1V, what is the mode of operation? Find ID in mA. b) If VGs = 3.3V and VDs = 0.1V, what is the mode of operation? Find ID in mA. c) If VGs 3.3V and Vos 3.0V, what is the mode of operation? Find lo in mA 4. Reconsider the transistor from #3 with VGS-3.3V and VDs = 3.0V. Recalculate ID in mA for each of the following permutations (individually) and comment on what influence this parametric variation has on the current: a) Cut in half the gate oxide thickness, tox b) Cut in half W. c) Cut in half L. d) Cut in half V

Explanation / Answer

Answer:- a) Since VGS < VT , so NMOS is in cutoff mode. In this case ID = 0.

b) VGS > VT and VDS < VGS - VT , so NMOS is in Linear Mode. So current ID is
= kn x(W/L)[ 2*(VGS - VT)*VDS - (VDS)2 ]
= 0.007 x 5 x [2*(3.3 - 1)*0.1 - (0.1)2 ] A
= 15.75 mA

c) VGS > VT and VDS > VGS - VT , so NMOS is in Saturation Mode. So current ID is
= kn x(W/L)[ (VGS - VT)2 ]
= 0.007 x 5 x [(3.3 - 1)2 ] A
= 185.15 mA

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