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Unformatted text preview: Prof. Sam Palermo ECEN 325 Exam #3 December 1, 2011 Texas A&M University
Department of Electrical and Computer Engineering ECEN 325 — Electronics Fall 2011 Exam #3 Instructor: Sam Palermo  Please write your name in the space provided below
0 Please verify that there are 4 pages in your exam 0 You may use gm; doublesided page of notes and equations for the exam
0 Good Luck! Prof. Sam Palermo ECEN 325 Exam #3 December 1, 2011 Problem 1 (30 points) For all the circuits below, use the following NMOS parameters
KPN=unCox=100uA/V2, VTN=1V, xN=OV" and the following PMOS parameters
KPp=upC0x=3OuA/V2, VTp=lV, xp=ovl For the following two circuits calculate
i. ID with W2/L2=20/ 1. (10 points)
ii. The minimum W2/L2 such that the M1 transistor remains in saturation (10 points) a) 10V Saar: {/05 2V4; “V7” For 50H“ " / ,. V 2'~\/ —‘ V
Vm EévIuw‘” 50’ 5" 7” v 6v
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2 
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For Umzsu «7 bi = : 5523* For V :9”? u mam) ,
(L32 IOWQW) at z [Mm/M (4v); 10(W2/L2=20/1)= (294/4 ID(W2/L2=20/l)= 3,75,”);
M1 sat Minwil/LZ: 151628” Ml Sat. MinWZ/L2= 416% c) For the following circuit ﬁnd the values for 1134 and VOUT. Assume all transistors are operating in saturation. (10 points) [ )
10V 9M. (MAM + M We r3 (/M 1/!“ 3
m 20/ 2
/ I + r 1 : gm A
lot 2 “’4 (’04) ' ‘34 Prof. Sam Palermo ECEN 325 Exam #3 December 1, 2011 Problem 2 (35 points)
Assume for problem 2 that the NMOS transistors are all operating in saturation and have
KPN=unCox=100uA/V2, VTN=1V, XN=0V’1 a) Calculate the DC values for ID, VD, VG, V5 and the AC smallsignal gml. (10 points)
10v T:me ml'f/Lf I
(20 l A
To :: (29") M
kn It
4:1)
Va: ’0‘] 400k+6wl<> / Vs = gml= 4""??? b) Sketch the smallsignal model of the circuit. Assume that the capacitors act as AC shorts and
only draw the essential transistor(s). (10 points) ’ , Gl a‘ Av: {OV/y
/ ~ c E ‘ riot?”
lei/2 __,: £3“; M: ( ~ it V ROUI=EK/IL Prof. Sam Palermo ECEN 325 Exam #3 December 1, 2011 Problem 3 (35 points)
This problem involves the small signal analysis of the circuit below. Assume that the transistors
are all operating in saturation and have r0=oo. a) Sketch the Circuit’s smallsignal model. Assume the capacitors act as AC shorts. (15 points)
VDD b) Derive expressions for the small signal gain AV=V0/Vi, input resistance Rm, and output
reSIStance Rout. (20 pomts) r V ’9 __ 05’“??? I?!
904’? MoJcl Above ‘ VA " “<33”?! 1’ I MN :) ﬁbrin {mt grew} 2 £2.(,"0)M:(9‘3“2¥?F> 14L 4% 7/3 Av
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Rm= r95: K” 4' l 'e’ I Prof. Sam Palermo (M
Kim ECEN 325 Exam #3 Scratch Paper Made, ‘ .5 December 1, 2011 ...
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This note was uploaded on 01/01/2012 for the course ECEN 325 taught by Professor Silva during the Spring '08 term at Texas A&M.
 Spring '08
 SILVA

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