Download Voltage - Introduction to Microelectronic Circuits - Exam and more Exams Microelectronic Circuits in PDF only on Docsity! UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Sciences Professor Oldham Fall 2000 EECS 40 โ MIDTERM #1 2 October 2000 Name: ______________________________ Student ID: _________ Last, First Signature: ____________________________ TA: โ Ben โ Warren โ Naratip Guidelines: 1. Closed book and notes except 1 page of formulas. 2. You may use a calculator. 3. Do not unstaple the exam. 4. Show all your work and reasoning on the exam in order to receive full or partial credit. 5. This exam contains 8 problems and corresponding worksheets plus the cover page. Problem Points Possible Your Score 1 15 2 15 3 12 4 10 5 15 6 10 7 11 8 12 Total 100 f 10 15โ= p 10 12โ= ยต 10 6โ= m 10 3โ= K 103= M 106= n 10 9โ= 1 of 16 Problem 1 (15 points) What is the value of the unknown node voltage in each of the following circuits? Assume diodes are perfect rec- tifiers. (a) (b) (c) Is R = T for all possible inputs? (WARNING: You must fill out truth tables in this problem to receive credit.) C B A y x R A B C x y R C B A z T A B C z T YES NO 4 of 16 Prob. 2 Worksheet 5 of 16 Problem 3 (12 points) For the circuit below: (a) Identify known and unknown node voltages, and (b) Write sufficient nodal equations to solve for the unknown node voltages (do not solve). Nodal Equations: + โ + โ VBB R3 d IDD c b R4 ICC R1 a VAA R2 __________________ (a.1) known node voltages: (a.2) unknown node voltages: __________________ 6 of 16 Prob. 3 Worksheet 9 of 16 Problem 5 (15 points) For the circuit above, the capacitor is initially uncharged. The switch closes at . (a) Find for and . (b) Sketch (very neatly and accurately!) vs. on the graph below. You must label the axes. (c) Write an equation for . + โ + โ + โVC 2V 5K 1pF 8V 2K t 0= 8K (initially uncharged) t 0= VC t 0 += t โโ VC t 0 +=( ) __________= VC t โโ( ) __________= VC t time ca p ac it o r vo lt ag e V c VC t( ) VC t( ) = 10 of 16 Prob. 5 Worksheet 11 of 16 Problem 6 (10 points) In the lab on RC circuits, you measure the pulse response of the circuit below. You know is . What is the value of ? C R OUTIN output pulse reaches 8V input pulse 10 V high, 100 ns long R 2Kโฆ C C __________= 14 of 16 Prob. 7 Worksheet 15 of 16 Problem 8 (12 points) In this experiment you โpeek,โ i.e., you open the box before testing it. You see the following circuit: What will be the I-V graph you will measure for this circuit? (You must label axes for credit.) A B 2M 3V2M 1M + โโ V + I Volts m A I V 16 of 16 Prob. 8 Worksheet
