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W09 314 HW03 all

W09 314 HW03 all - EECS 314 Winter 2009 Homework set...

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EECS 314 Winter 2009 Homework set ___ 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 © 2009 Alexander Ganago Page 1 of 2 Scores for the HW set: Problem 1 2 3 4 5 6 7 Total Score Problem 1 The “Golden Rules” applied to a basic Op Amp circuit For the circuit shown on the diagram, do the following: Part 1 (10 points) Write the node voltage equation for V + , first without using the GR and then after applying the GR, in the space below. From the latter equation, calculate the voltage V + in volts and write your answer: V + = ______ V Part 1 2 3 4 Total

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EECS 314 Winter 2009 Homework set ___ 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 © 2009 Alexander Ganago Page 2 of 2 Problem 1, continued The ckt diagram is repeated here for your convenience. Part 2 (10 points) Write the node voltage equation for V , first without using the GR and then after applying the GR, in the space below. From the latter equation, calculate the voltage V OUT in volts and write your answer: V OUT = ______ V Part 3 (10 points) From the the node voltages, calculate the currents I 10 , I 50 , and I 91 in mA and write your answers: I 10 = ______ mA I 50 = ______ mA I 91 = ______ mA Part 4 (10 points) From KCL, calculate the Op Amp's output current I OUT in mA and write your answer: I OUT = ______ mA Verify whether KCL is valid at the ground node. Write your conclusion: Yes / No (circle one) Do not be surprised by the possible “violation” of KCL: your calculation is incomplete, because the circuit diagram is incomplete, lacking the power supplies (such as – 12 V and +12 V), which can carry large currents! Show your work.
EECS 314 Winter 2009 Homework set 3 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 © 2009 Alexander Ganago Page 1 of 2 Problem 2 Voltage follower, or buffer circuit The Op Amp circuit shown on this diagram has negative feedback: its output is connected to the inverting (-) input with a wire. Thus, by the second Golden Rule, which we will discuss in detail further, V OUT = V IN . Note that the current into the Op Amp’s non-inverting (+) input terminal is negligible, according to the first Golden Rule. This circuit is called voltage follower, because its output voltage follows the input. This circuit is also called buffer, because it separates the circuit connected to the input from the circuit connected to the output, which is extremely useful in many applications.

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W09 314 HW03 all - EECS 314 Winter 2009 Homework set...

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