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ece hw2 - 1 University of Massachusetts Department of...

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1 University of Massachusetts Department of Electrical and Computer Engineering ECE 323 Electronics I Fall 2010 Problem Set 2: Do problem 5.78 in Sedra and Smith plus the problems below. Problem 1: In this problem assume that Beta is infinite and that |V be |=0.7V for all transistors. Draw each of the circuits below, label the voltage at each node, and show how you calculated the node voltages. Figure 1: Simple Transistor Circuits Problem 2: Now, lets use a more realistic model of the transistor by using Beta=100. You should continue to model |V be |=0.7V for all transistors. As above, draw each of the circuits below, label the voltage at each node, and show how you calculated the node voltages. Figure 2: More Simple Transistor Circuits Problem 3: In the first problem of problem set 1, you analyzed a circuit for converting AC to DC. In practice, that circuit is generally followed with a voltage regulator that insures that the powered by the DC supply have a precise power supply. The heart of any voltage regulator
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