Midterm Exam 1 - Electrical Eng: Circuit Parameters & Thevenin Equivalents, Exams of Microelectronic Circuits

Download Midterm Exam 1 - Electrical Eng: Circuit Parameters & Thevenin Equivalents and more Exams Microelectronic Circuits in PDF only on Docsity! EE 40 Midterm Exam #1 February 20, 2003 PLEASE WRITE YOUR NAME ON EACH ATTACHED PAGE SHOW WORK TO OBTAIN MAXIMUM PARTIAL CREDIT Problem 1: 15 Points Possible Problem 2: 5 Points Possible Problem 3: 15 Points Possible Problem 4: 15 Points Possible Problem 5: 15 Points Possible Problem 6: 10 Points Possible Problem 7: 15 Points Possible Problem 8: 10 Points Possible Total: 100 Points Possible Problem 1: 15 Points Possible The memory components of many personal computers require voltages of -12V, 5V, and 12V all with respect to a common reference terminal (ground). Find R1, R 2, and R3 in the circuit below so that (when nothign additional is attached to the circuit) 1) The power generated by the voltage source is 48 mW AND 2) V 1 = 12 V, V2 = 5 V, and V3 = -12 V with respect to ground. Problem 4: 15 Points Possible Find the Thevenin equivalent circuit as measured at terminals a and b, for the circuit below. Problem 6: 10 Points Possible While you were finishing up that nodal analysis from Problem 5, clumsy old Prof. Ross walked across the room and tripped on a power cord, pulling it out of the wall outlet. As a result, the independent source voltages and currents from Problem 5 are now 0 V and 0 A. Now find the equivalent resistance of the remaining circuit with respect to points a and b. Problem 7: 15 Points Possible Consider the RC circuit below, which models a digital logic gate. Wehn changing Vin from logic 1 (5 V) to logic 0 (0 v) and back to perform different computations, we want to make sure that there is enough time between input changes to allow the output, Vout, to fully respond. Specifically, we would like to ensure that Vout reaches the minimum value recognizable as logic 1 after the input steps from low to high (0 V to 5 V). This value, VIH, is 3.5 V. Also, we would like to ensure that Vout discharges to the maximum value recognizable as logic 0 after the input steps from high to low (5 V to 0V). This value, VIL is 11.5 V. Determine the amount of time it takes for the discharged capacitor to charge to 3.5 V, and the amount of time it takes for the fully charged (5 V) capacitor to discharge to 1.5 V.