Electronics EECE2412 Spring 2018 Exam #2
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1 Electronics EECE2412 Spring 2018 Exam #2 Prof. Charles A. DiMarzio Department of Electrical and Computer Engineering Northeastern University 29 March 2018 File:12262/exams/exam2 Name: General Rules: You may make use of two sheets of notes, 8.5 by 11 inches, using both sides of the page. You may use a calculator. Present your work as clearly as possible. I give partial credit if I can figure out that you know what you are doing. I do not give credit for putting down everything you know and hoping I will find something correct in it. Each question has a vertical black bar providing space for your work and a line for numerical answers or box for plots or drawings. Please write your answer to each question clearly. If it happens to be correct, I give you points quickly and move on to the next problem. Please show your work in the space provided, or on extra pages, clearly labeled with the problem number. If the answer is wrong, this will make it easy for me to find ways to give you partial credit. Avoid any appearance of academic dishonesty. Do not talk to other students during the exam. Keep phones, computers, and other electronic devices other than calculators secured and out of reach.
2 1 SHORT ANSWER QUESTIONS 1 Short Answer Questions 1. It is not possible to have zero DC voltage on both the input and output of a single stage common emitter amplifier. True False 2. The Early Voltage is a measure of the base collector voltage. the slope of i C plotted against v CE the slope of i C plotted against v BE 3. The collector emitter voltage of a BJT in saturation is 0.2 V 0.5 V 0.7 V 4. Delay in BJT logic gates results in delay in the output but the outputs are always correct. True False 5. A common emitter amplifier provides Unit current gain. Unit voltage gain. High gain. 6. The emitter resistor in a common emitter amplifier Helps set the DC bias. Reduces the amplifier gain. Both of the above. DiMarzio 12262/exams/exam2, Feb 2017 Page 2
3 1 SHORT ANSWER QUESTIONS 7. BJT Logic circuits have the following properties. Check all correct answers. They are fast enough to be used in modern computers. They consume large amounts of power. They cannot be used in long chains. 8. The arrow on a BJT symbol is on the Emitter. Base. Collector. 9. A PNP transistor in a certain circuit is in active mode. The collector is connected to ground through a resistor. The emitter is connected to a positive voltage. ground. a negative voltage. 10. Transconductance depends strongly on the Beta of the transistor. True False DiMarzio 12262/exams/exam2, Feb 2017 Page 3
4 2 BJT DC BIAS 2 BJT DC Bias Consider the circuit in the figure. The transistor has β = 100. R 1 = 270 kohms, R 2 = 160 kohms, R E1 = 0, R E2 = 2 kohms, R C = 4.5 kohms. All capacitors are large enough and V CC = V EE = 9 V. 2.1 DC Circuit FindaTheveninequivalentfor thebasecircuitandthendrawthedccircuit. Label all the components with their values. DiMarzio 12262/exams/exam2, Feb 2017 Page 4
5 2 BJT DC BIAS 2.1 DC Circuit (DC Circuit:) DiMarzio 12262/exams/exam2, Feb 2017 Page 5
6 2 BJT DC BIAS 2.2 Bias 2.2 Bias What is the DC base current? I B = ma. What is the DC collector current? I C = ma. What is the DC voltage at the collector? V C = V. What is the DC voltage at the emitter? V E = V. DiMarzio 12262/exams/exam2, Feb 2017 Page 6
7 3 BJT AMPLIFIER 3 BJT Amplifier Use the same circuit as in Problem 2. Assume that the transconductance is g m = 0.08 A/V. 3.1 AC Circuit What is the value of r π? r π = Ohms. Draw the AC circuit. (AC Circuit:) DiMarzio 12262/exams/exam2, Feb 2017 Page 7
8 3 BJT AMPLIFIER 3.2 Amplifier Parameters 3.2 Amplifier Parameters What is the voltage gain? A V =. What is the input impedance? Z in = Ohms. What is the output impedance? Z out = Ohms. DiMarzio 12262/exams/exam2, Feb 2017 Page 8
9 4 BJT LOGIC 4 BJT Logic Consider the logic inverter circuit shown in the figure. The transistor has β = 200. R b = 10 kω and R c = 1 kω. 4.1 Transfer Characteristic Treat the circuit as an amplifier and calculate the gain. Then carefully draw a plot of the transfer characteristic, v OUT as a function of v in. Use a range of zero to VCC on both axes. DiMarzio 12262/exams/exam2, Feb 2017 Page 9
10 4 BJT LOGIC 4.2 Inputs (Transfer Characteristic:) 4.2 Inputs What is the minimum value of the high input voltage to ensure that the circuit produces a low output. What is the maximum value of the low input voltage to ensure that the circuit produces a high output. 4.3 Outputs What is the high output voltage? What is the low output voltage? DiMarzio 12262/exams/exam2, Feb 2017 Page 10
11 4 BJT LOGIC 4.4 Power 4.4 Power How much power is consumed by the circuit (both transistor and resistor) when the output is high? How much power is consumed by the circuit when the output is low? DiMarzio 12262/exams/exam2, Feb 2017 Page 11
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