Download General - Introduction to Microelectronic Circuits - Exam and more Exams Microelectronic Circuits in PDF only on Docsity! EECS 40 MIDTERM 1 FALL 2004 Prof. White Print Name __________________________________________________________ Sign Name ___________________________________________________________ 1 /6 2 /13 3 /20 4 /14 5 /12 6 /5 7 /20 8 /10 Total /100 1 Problem 1 General Questions [6] [1] To measure the voltage drop of a current-carrying resistor you put your voltmeter in series with the resistor. True ___ False ___ [1] The amount of current flowing in a resistor decreases linearly as we go from its positive terminal to its negative terminal. True ___ False ___ [1] The equivalent circuit for three inductors in parallel is like that for three resistors in parallel except that L’s replace R’s. True ___ False ___ [1] List the circuit elements that are linear: ___________________________________ [1] List the circuit elements that dissipate energy: ______________________________ [1] The conductance of a 47 Ω resistor is _____________ (value) __________ (unit) 2 Note: Answers from here on may cause the maximum current limit to be exceeded. [4] c. If we connect a variable resistive load across terminals a, b, what is the maximum current we could draw through the load? Answer: Maximum current = ______ [4] d. What load resistance would produce the maximum power transfer from the voltage divider, and what is the value of that power? Answer: Load Resistance = _______ Max. Power = ______ [4] e. Thought question: If we had a 100 Ω load resistor RL connected to the output of a Thevenin equivalent circuit having a fixed Vth = 2 V and a variable Rth, what value of Rth would produce maximum power dissipation in RL? Answer: Rth = ______ Maximum possible power dissipation in load = ______ 5 Problem 4 Nodal Analysis [14] [9] a. For the circuit below write a set of three nodal equations. (Apply KCL at nodes A, B, and C, and use iC = CdvC/dt for the capacitor.) DO NOT SOLVE ANY EQUATIONS. Answer: Node A: Answer: Node B: Answer: Node C: [5] b. A “supernode” is shown by the oval in the circuit below. Write the nodal equation that applies at the “supernode”. DO NOT SOLVE THE CIRCUIT EQUATIONS. 6 Problem 5 Power [12] Find the power that is either dissipated in or delivered by the current source I0 in the circuit below, and determine whether the power is dissipated or delivered. Make your methods clear to the grader. Given V0 = 5 V; I0 = 2 mA; R1 = 1 kΩ; R2 = 2 kΩ. Answer: Power dissipated/delivered (circle one) is ______ (value) ______(unit) Problem 6 Circuit Fragment [5] A resistor in a portion of a very large circuit is shown. Find the current IR given R7 = 100 kΩ; V3 = 2 V; I0 = 5 mA; I1 = -15 mA; I3 = 25 mA; I5 = 40 mA. Answer: IR = ______ 7
