ESENER ECE108 HW SET 2 SPRING 2010 Problem 1.An NMOS NOR gate with resistive load uses MOSFETs each with a threshold voltage =0.8. =5. a) With only one input high 1=5 , it is desired to obtain an output voltage =0.4at a current flow from the power supply of =4. Determine and . b) Using a substrate doping =1∙1015 −3,=650 ∙ ,=0.2determine , the oxide capacitance per unit area and W, the channel width, to yield the desired current. c) What will the output voltage be if all inputs are high? b) Problem 2.An NMOS depletion load inverter uses the same NMOS transistor as in 1). The load device has a threshold voltage =−2.5 . =5. To achieve the same output voltage (=0.4) for (=5as in 1), calculate the required for the pull-up transistor.
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