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# IUPUI ECE 20400 - ECE204Fall13Exam+2

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IUPUI ECE 204 Fall 2013 EXAM #2 Name: 1 1. (25 points) In the circuit shown, the switch has been closed for a long time. It opens at t = 0. V1 = 12V, V2 = 3V, R1 = R2 = R3 = 1KΩ, L = 0.1H. a) Determine the inductor current just before the switch is opened, iL(0). b) Determine the inductor current after a long time, iL(∞). c) Determine the time constant τ (= ) for t > 0. d) Determine iL(t) for . e) Determine the value for iL(t) after one time constant. f) Write the differential equation for the circuit for .IUPUI ECE 204 Fall 2013 EXAM #2 Name: 2 Blank PageIUPUI ECE 204 Fall 2013 EXAM #2 Name: 3 2. (20 points) For the ideal op amp circuit shown below: a) Find if, the current through the 50 KΩ resistor. b) Find vo, the voltage across the 20 KΩ resistor. c) Find io, the current through the 20 KΩ resistor. if + V 0 -IUPUI ECE 204 Fall 2013 EXAM #2 Name: 4 3. (20 points) For the ideal diode circuit shown, determine if the diode is conducting or not. Show your work. Hint: Assume the diode is on by replacing it with short circuit or assume the diode is off, by replacing it with open circuit and then prove or disprove your assumption.IUPUI ECE 204 Fall 2013 EXAM #2 Name: 5 4. (20 points) For the following BJT circuit, determine the operating point by calculating the load line and using the i-v characteristic curve for the BJT. Assume VBE = 0.7V. Provide an operating base current, collector current and the voltage across the collector and emitter, vCE. 67.75k20V5k15k20V250IUPUI ECE 204 Fall 2013 EXAM #2 Name: 6 5. (15 points) An enhancement-type NMOS transistor has: VT = 2V and iD = 1 mA when vGS = vDS = 3V. a) Determine the operating region of the transistor. Justify your answer. b) Find the value of iD for vGS = 4V.IUPUI ECE 204 Fall 2013 EXAM #2 Name: 7 ECE204 Exam 2 Equation Sheet ∫ ( ) ( ) ( ) ∫ ( ) ( ) ( ) ( ) ( ) ( ) [ ( ) ( )] ∑ ( ) ∫ ( ) ( ) ( ) ( ) [ ( )

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