ee42_su12_f - Department of Electrical Engineering and Computer Sciences University of California Berkeley Electrical Engineering 42\/100 Summer 2012

ee42_su12_f - Department of Electrical Engineering and...

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Electrical Engineering 42/100Department of Electrical Engineering and Computer SciencesSummer 2012University of California, BerkeleyInstructor:Tony DearFinal Exam: Friday, August 10, 2012Last Name:First Name:SID:Discussion (circle one):9-11am (Jerry)10-12pm (John)12-2pm (William)2-4pm (Dennis)Notes and Instructions1. Fill out the information above as clearly and accurately as possible.2. You have 110 minutes to complete this exam.3. This exam contains five questions, on a total of sixteen pages (including this one).4. Do all your work andboxall answers on the provided paper; do not hand in loose papers.5. None of the questions require long-winded calculations.Show your work clearly and concisely; partialcredit will be given, but unclear or unnecessarily complicated work may be penalized.6. Two sheets of notes may be used on this exam.7. You may not communicate with anyone else during the course of the exam, nor are electronic computa-tional devices allowed. Academic dishonesty policies will be enforced.8. The staff wishes you the best of luck, both on this exam and in all your future endeavors. It’s been anawesome semester!I have read all of the above instructions and agree to comply with them. All of the work on this exam is my own,and I had no prior knowledge of the exam contents.Signature:The logic gates and CMOS circuit look like they’re about to commence battle. :PQuestionQ. 1Q. 2Q. 3Q. 4Q. 5TotalScore/15/15/30/20/20/100
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1.Diodes Have Capacitance?!?!Frustrated at how inaccurate all our linear diode models have been, John decides to cook up another one.The Zener diode below has a linear ON characteristic and a breakdown voltageVBlike any other, but itis modeled as acapacitorCDwhen it is reverse-biased, or OFF.iDvD12OFFBDON(V)(A)Reverse-Bias (OFF)=+-vDiDCD-10(a)(3 points)Let’s first analyze the diode in its forward-bias (ON) mode. What is its linear circuitequivalent in this region of operation? Label the directions ofvDandiD.
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