exam3_spring2009

exam3_spring2009 - Prof. Sam Palermo ECEN 325 Exam #3 April...

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Unformatted text preview: Prof. Sam Palermo ECEN 325 Exam #3 April 29, 2009 Texas A&M University Department of Electrical and Computer Engineering ECEN 325 — Electronics Spring 2009 Exam #3 Instructor: Sam Palermo 0 Please write your name in the space provided below 0 Please verify that there are 4 pages in your exam 0 You may use 015 double-sided page of notes and equations for the exam 0 Good Luck! Problem Score 4 Max Score fl 1 30 2 l 35 3 35 Total | 100 Name: Mfié UIN: Prof. Sam Palermo ECEN 325 Exam #3 April 29, 2009 Problem 1 (30 points) For all the circuits below, use the following NMOS parameters KPN=unCOX=l OOuA/VZ, Vm= l v, newl and the following PMOS parameters KPp=ppCox=30t1AfV2, VTPZ-l V, xp=0V“ For the following two circuits calculate i. ID with RD=1kQ. (10 points) ii. The maximum RD such that the transistor remains in the saturation region (10 points) a) 10v 5" WW" FM SW : b) 10v \lp)a vagwa/V v50 '2' V50”)VT‘P‘ E Z av-wazv 53¢“ [an/law 1'0 I—{S EMH' ’1 54¢; '22, Kflu flies" V7”) TD If (U56: ‘“/¢r’/)Z 2%))? .2: m4 ‘ é (way/am? : 409M gtf (gaéwfieaflg V/fozlk/L r”:> V0 5 0' 4 V (Sigma) , 472w M r? = 'w I M 0 (co/M 1D(RD=1kQ)= @3944 1 (R =1ko)= A D D ’20! 5 IKE/(A Sat,MaxRD= BKF/l Sat. Max RD = c) For the following circuit find the values for 1.32 and VOUT. Assume all transistors are operating in saturation. (10 points) 10V *qu/I'SZS-Go/i «At! A” av «10, WA Ml MA M; 520% as fa/ca/ cur/07% MI/fo/S' ~T 4/” ’ Mglrlm / - 2% £3); W 2”” VOUT: l l Prof. Sam Palermo ECEN 325 Exam #3 April 29, 2009 Problem 2 (35 points) Assume for problem 2 that the NMOS transistors are all operating in saturation and have KPN=unCOX=100uA/V2, va=1v, xN=0V" a) Calculate the DC values for ID, V9, V0, V5 and the AC small-signal gml. (10 points) 10V ID: ZMA VD: QV' VG: 4.€V Vs: 2. gm‘: 4:9M’4/V b) Sketch the small-signal model of the circuit. Assume that the capacitors act as AC shorts and only draw the essential transistor(s). (10 points) AV .1: -— WM (,J/Q) -.~. ~ 43? "4% gill/2M”) 243% £1}? : )6; “7 43KO/(//5’§Z9K ’63s)?" 3 3 Prof. Sam Palermo ECEN 325 Exam #3 April 29, 2009 Problem 3 (35 points) Assume for problem 3 that the NMOS transistors are all operating in saturation and have KPN=unCOX=lOOuA/V2, VTN=1V, xN=0V1 a) Calculate the DC values VD], V01, V51 and AC small-signal values gm] and gm2. (10 points) V9, ‘3 V00 " @061 f VT”) 10V ’ ‘ ' ' Vs1= 2.7M z Z a ‘W =5 time—{Lag ‘lQW/yaaoflzwzz) 233W ng : I {4/ b) Sketch the Circuit’s small-signal model. Assume the capacitors act as AC shorts. (10 points) G! 0‘ = 5'2 ...
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exam3_spring2009 - Prof. Sam Palermo ECEN 325 Exam #3 April...

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