quiz2_SP2009

quiz2_SP2009 - Problem 3: Find the current I o through the...

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Course: ECE 53a Quiz #2 Instructor: Pamela Cosman Date: 2/11/09 First Name: Last Name: There are 4 problems. Each problem is worth 10 points. Problem Possible Score 1 10 2 10 3 10 4 10 Total 40 On this quiz you may use one page of notes (8.5 by 11 inches, both sides of the page). No other notes or books allowed. No calculators. You need to show your work for all problems.
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Problem 1: In the following circuit, Fnd the output voltage V o in terms of the source voltage V s . Assume that the op amp shown is an ideal (inFnite gain) operational ampliFer. + - - + V S + V 0 - 3 1 2 4
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Problem 2: (a) Given a box of 10-k Ω resistors and an ideal (inFnite gain) op-amp, show how to design a circuit that would have an output voltage that equals one third of the input voltage, regardless of the load that might be attached to the output terminals. (b) Suppose it turns out now that the ampliFer which you thought could be treated as having inFnite gain actually has a gain of only 100. With the circuit conFgured as you have it in part (a), what is the relation between the input and output voltages?
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Unformatted text preview: Problem 3: Find the current I o through the 2 resistor using Thevenins theorem. That is, fnd the Thevenin equivalent or the circuit without the 2 resistor present, across the terminals where the 2 resistor is connected. Draw the Thevenin equivalent circuit. Attach a 2 resistor to the Thevenin equivalent and compute the current through it using that simple circuit. V x I o + _ 8 4 4 12 12V-+ + _ 2 x 2V Problem 4: For this circuit, suppose that V c ( t ) is described by the function given below right. That is, V c ( t ) = 0 for t , V c ( t ) = t for < t 1 , and V c ( t ) = 1 for t > 1 . Find expressions for the following 5 things: (a) i ( t ) , (b) i R ( t ) , (c) V R ( t ) , (d) V s ( t ) , and (e) V o ( t ) . Your nal expressions should be functions of t but you should not have any variables such as V c ( t ) in your nal expressions. (You do not need to sketch any of them). +--+ V S-V R + C V-+ + V-R V C 2 2F i i t 1 1...
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quiz2_SP2009 - Problem 3: Find the current I o through the...

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