Midterm_Solutions_F09

# Midterm_Solutions_F09 - Name/Perm No SOLUTIONS ECE 124AFall...

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Name/Perm No.: SOLUTIONS ECE 124A–Fall 2009 Prof. K. Banerjee 1/11 UNIVERSITY OF CALIFORNIA, SANTA BARBARA Department of Electrical and Computer Engineering MIDTERM EXAMINATION-ECE124A Room: ESB-Cooper Lab, November 3, 4:00-6:00 PM READ CAREFULLY: This is a CLOSED BOOK Exam. Any form of notes is not allowed. Calculators OK. 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 10 pages including the cover page. Be sure to write Your NAME/Perm No. on EVERY PAGE. Question Scores #1 / 30 #2 / 20 #3 / 25 #4 / 25 TOTAL / 100 Good Luck!

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Name/Perm No.: SOLUTIONS ECE 124A–Fall 2009 Prof. K. Banerjee 2/11 1. (30 pts) (suggested time: 30 minutes) i) The layout of a transistor is shown below. (10 pts) Draw the cross sections of this device along the lines AA’ and BB’. Solution: Note: the figures are not drawn to scale Cross-section along AA’: Cross-section along BB’: Active Area
Name/Perm No.: SOLUTIONS ECE 124A–Fall 2009 Prof. K. Banerjee 3/11 ii) The cross section of a new ultra-low leakage device designed by a UCSB graduate student is shown below. Assuming that material 1 (M-1) has a higher bandgap than that of material 2 (M-2), draw the energy band diagrams for this device along the lines AA’ and BB’, when gate, source, and drain are all held at the ground potential. The bottom layer, BOX, represents a buried oxide layer and is the same as the gate oxide material (SiO 2 ). Assume that work function (WF) of the gate material < WF of M-2 < WF of M-1. (10 pts) Solution: A A’ B’ B

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Name/Perm No.: SOLUTIONS ECE 124A–Fall 2009 Prof. K. Banerjee 4/11 A-A’ B-B’
Name/Perm No.: SOLUTIONS ECE 124A–Fall 2009 Prof. K. Banerjee 5/11 iii) The layout of a CMOS circuit is shown below. Determine the corresponding circuit configuration and draw the transistor level schematic for this circuit.

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Midterm_Solutions_F09 - Name/Perm No SOLUTIONS ECE 124AFall...

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