This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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
2 V90! ZéV’sz
To: l£%(lo)(S\/) :IZSnA of V ‘élou,§'v : CV
2 
, , 2(25m0 > g 30 ( :3.” 4M2
\lot’ [0‘] Gigi—(337+) 10’ #(lo) M
15.441/ ~‘f>/Vll5a+ V0,: 7" :; Zoﬁm/r—DM/
ICC/“(207 5&1"
.. ) ‘
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
Kg: +82 *’ grufzﬂF F223 +5”)? IQ: 6M 4» ?é ,
Rm= r95: K” 4' l 'e’ I Prof. Sam Palermo (M
Kim ECEN 325 Exam #3 Scratch Paper Made, ‘ .5 December 1, 2011 ...
View
Full Document
 Spring '08
 SILVA

Click to edit the document details