EECS314_W08_HW11_p1 - EECS 314 Winter 2008 Homework set 11...

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EECS 314 Winter 2008 Homework set 11 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above © 2008 Alexander Ganago Page 1 of 4 Scores for the HW set: Problem 1 2 3 4 5 Total Score Problem 1 Circuit model for a Bipolar Junction Transistor (BJT) Amplifier The Big Picture The Bipolar Junction Transistors (BJT) act as current amplifiers. On the circuit diagrams, they are modeled with dependent sources (diamond-shaped). In this circuit, we use a current-controlled current source whose current β⋅ I B is proportional to the controlling current I B The methods of circuit analysis, which you learned in this course, work fine in circuits with dependent sources. This circuit is easy to solve by either mesh or node analysis. The Assignment Part 1 (10 points) Derive the algebraic equation for the amplifier’s output signal as a function of the input signal, resistances and the current gain β . Your answer: Part 1 2 3 4 Total
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EECS 314 Winter 2008 Homework set 11 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above © 2008 Alexander Ganago Page 2 of 4 Problem 1 (continued) Part 2 (10 points) Assume that the input is a sum of DC offset V IN, DCO and the sinusoidal signal V S, IN = V IN, MAX sin( ω t) that is: Input signal = V IN, DCO + V IN, MAX sin( t) Use your result of Part 1 to calculate the output signal in the form Output signal = V OUT, DCO + V OUT, MAX sin( t) Note that you do not need phasors for this calculation! Your answer: Output signal = ________________________________________ Determine the DC offset of the output signal V OUT, DCO and the AC gain: AC Gain = (V OUT, MAX ) / (V IN, MAX ) Your answers: V OUT, DCO = ____________________________________________ AC Gain = ____________________________________________ Based on the sign of AC gain, determine whether the amplifier is inverting or non- inverting. Your answer: ____________________________________________ Part 3 (10 points) From your result in Part 2, calculate the AC gain for the following circuit parameters: R B = 1.5 k Ω , R C = 15 k Ω , R E = 300 Ω , β = 100. Your answer: ____________________________________________ By how many % does the AC gain change if the transistor’s varies from 50 to 200 ?
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EECS 314 Winter 2008 Homework set 11 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible
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This note was uploaded on 09/04/2008 for the course EECS 314 taught by Professor Ganago during the Winter '07 term at University of Michigan.

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EECS314_W08_HW11_p1 - EECS 314 Winter 2008 Homework set 11...

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