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e1 - EECE 416/501 Fall 2009 Name 50/u7L101/I This exam is...

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Unformatted text preview: EECE 416/501, Fall 2009 Name: 50 /u7L101/I This exam is to be completed individually, 'but you may use your notes. All students must adhere to the Student Academic Honesty Code of the University and the Watson School. The Department of Electrical and Computer Engineering has adopted a standard policy to enforce these codes for violations involving course work. Category I violations result in a grade of 0 for the graded work plus a full letter grade reduction for the course. A Report of Category I Academic Dishonesty form is filed with the Provost’s Office; if a prior report is already on file, the offense is automatically elevated to Category II. Category II violations result in at least a failing grade for the course plus any additional penalties determined by the Watson Academic Integrity Committee. Academic Honesty Policy 1. (20%) Based upon the layout depicted below, draw the equivalent schematic to the right and answer the following multiple choice questions. Assume Vb is a constant. a b Vi VDD I7! A Metal 1 I Contact/Via N+ N—well o /o How many transistors of each type are in this layout? / (A) 1 nFET and l pFET (D) 1 NPN and 1 PNP (E) 2 NPN (C) 2 pFET (F) 2 PNP 4/% Identify the amplifier. (Circle all that apply.) ource—follower (E) Emitter—follower (B) Common—source (F Common-emitter ) (C) Common-gate G) Common—base ) Common—collector ( (I E) Common—drain > (H o a a n o n n 7 % In Which reglon is the ampllfier operating. (A) Sub—threshold (B) Moderate—inversion (C) Above—threshold ) (D Not enough information to determin- October 27, 2009 'Exam 1 , 1/5 EECE 416/501, Fall 2009 Name: & /M.7L4'6//( 2. (21%) For each circuit below, select the small—signal model (A through F) that best approximates the circuit. Please write your answer in the box above each circuit. Some answers may be used multiple times or not at all. Assume VB is a constant voltage and that all nFET and pFET parameters are the same( (for example, ro— — ron— — rop). II E] II I I October 27, 2009 Exam 1 2/5 EECE 416/501, Fall 2009 {a 4.742” Name: 3. (19%) A student in‘Analog CirCuit DeSign was handed a three—terminal nFET transistOr and asked to characterize the output resistance of the transistor. The student connected the source of the transistor to ground through an ammeter, biased the gate at 2.5 V, and swept the drain from O V to 3.3 V. The measured current is shown in the plot to the left below. Thinking that something might be wrong, the student then plotted the square root of the same data on a linear plot, shown on the right. .1. o Measured Current 5 ,_. o J. N i r. ” "10 (Circle all that apply.) (0) VTo Based upon these plots, what (A) Nothing is wrong. (B) (C) The source and drain are 4% Which transistor parameter(s) The source and gate‘are swapped. D) The gate and drain are swa ed. (E) The device was not an nFET. 0.07 0.04 0.03 0.02 8th Measured Current 0.01 3.5 4 4.5 5 By performing the described sweep, the student trying to extract which transistor parameter(s)? (D) a (sub-VTh) (G) K Try/mg VA \_ (E) a (above-VTh) ~ H) VA {‘0 7 f (F) ITh should the student conclude regarding the circuit? 0L + .‘ alaarl/ a flare 5“:an d. " 1/5 swappe if!” Qua/9 fled.“ ”Mu/A M 5 a re foot \ c. an ’ bro?“ VD M [AHO'I’A‘IO +9 ; 4 MM" can the student actually extract with only the measured data? Assume no other data is available except what is depicted above. (Circle all that apply.) MA ' @1645 “(A 18 V A éoul‘ce fume/0 ‘9 ”‘3 C‘E % M (A) UT (D) H,(sub—VTh) (c) For U—r, x, and /<, WOW/l \> (B) Io (E) a (above—VTh) (H) VA VA r a 7 w. ”1:; in); {515%, .m .(m 7%; 5+ 6" ‘V ’7”? if perflr‘m. ‘ October 27, .2009 Exam 1 3/5 H = 1 (above VT) Io = 10 pA K, = .7 (sub VT) VA = 200 V ITh = 3 MA Io = 10 pA K, = .8 (sub VT) 4. (20%) For the circuit below, find the value of the resistor, the transconductance, the output resistance, and the voltage gain. The steady-state output voltage is 1.8 V. 3.3V VOD¢= I.5’l/ .é/zfl- _ a 14 * Gm IQM+ = wfl/l/u. 50/m« 3 2M, p- or (gal/V -‘/9.é.é}22 2.” October 27, 2009 Exam 1 4/5 EECE 416/501, Fa112009 Name: 50 /a 75'”: 5. (20%) For the circuit below, draw the complete small—signal model Without simplifying. Now simplify the small—signal model to the equivalent two—port model. Find the transconductance, the output resistance, and the voltage gain. Assume the parameters for the nFET and the pFET are the same (r0 = Ion = rep, etc). Simplify your gain expression as much as possible. V DD October 27, 2009 Exam 1 5/5 ...
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