midterm_sol - Name Solutions Perm No ECE 124AFall 2008...

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Name: Solutions ECE 124A–Fall 2008 Perm No. ______________________ 1/9 UNIVERSITY OF CALIFORNIA, SANTA BARBARA Department of Electrical and Computer Engineering MIDTERM EXAMINATION-ECE124A Room: ESB-Cooper Lab, November 7, 4:10-6:10 PM READ CAREFULLY: ¾ This is a CLOSED BOOK Exam. Any form of notes is not allowed. Calculators OK. ¾ READ the questions carefully before answering. Include all your answers in locations specified on these pages. Show ALL WORKING used to arrive at answers. Use space provided for all working. Use the back sides if necessary. There are 9 pages including the cover page. Be sure to write Your NAME/Perm No. on EVERY PAGE. Question Scores #1 / 20 #2 / 20 #3 / 25 #4 / 35 TOTAL / 100 Good Luck!
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Name: Solutions ECE 124A–Fall 2008 Perm No. ______________________ 2/9 1. (20 pts) (suggested time: 20 minutes) In this problem, assume |VTP| = 0.5V, VTN = 0.4V. Also, VDD = 2.5V. a) In the circuit shown above, identify which of the NMOS transistor M1’s terminals (gate, source, drain) correspond to Vin, Vout, and Vdd (3pts) Solution: b) What is the voltage at the output Vout when Vin = 0V? What about when Vin = Vdd ? (2pts) Solution: c) Exchange both the NMOS transistors for PMOS transistors, and repeat part b) (2pts) Solution: d) What is the maximum number of NMOS passgates can you can cascade (in the manner shown in the figure below into an ideal, symmetrical inverter (Vswitch = 1.25V) before Vout is no longer a ‘0’ ? (4pts)
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Name: Solutions ECE 124A–Fall 2008 Perm No. ______________________ 3/9 Solution: e) For the circuit shown in the figure below, what is the value of Vout for Vin = Vdd? For Vin = 0V? (4pts) Solution: f) In the figure below, V1 changes slowly from -1V to 0V, what is the value of Vout at V1=-1V and V1= 0V? (5pts) V1 0V -1V Î 0V Vout=?
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