MidtermExam#1_2008

MidtermExam#1_2008 - Name: -------------- So L. v1T I t rJ...

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Unformatted text preview: Name: -------------- So L. v1T I t rJ ~ EE 482 - Electronics II Mid-Term Exam # 1 Thursday, March 27, 2008 Use only these pages for your calculations and answers. There are 50 total points. Answer all questions. Work must be shown for partial credit. ;j 9fX points) 1. An amplifier is shown in the figure below. NMOS device data: kn = 1.66 mA/V2; VtNO = +0.4 V; Yn = 0 Vl/2; A = 0 for DC analysis and A = 0.1 V-I for small-signal analysis; X = 0.2. = (a) Choose Rs to make the DC voltage at the drain, VD assumptions. jX"pts} / 1!7 1 V. VerifYall 1.5 V 1.67 kD IOOkD 2.5 kD -1.5 V -v, - - ---V /4\j) ~ _ L~ ":0" (yl! ,\ 'Ie.- - V(.) J vD;)cI -::. Vc) ~ Vt Rin . == ::: 0, Ie V r :•.. f '\ ,/ rc'"' 'c). (b) Calculate .ptpts} ~ I C{ fA II I. i l;! Page 1 of 3 Initials: ----- 1.5 V 1.67ill 100 kQ 2.5 kQ -1.5 V (d) Consider the small-signal equivalent circuit. If Va is a 0.3 V sinusoidal signal (Va = 0.3 sinrot), determine the signal at the MOSFET source, Vs (not Vsig). [5 pts} )----/.~ f. ._-_.-_.. j. ~(b -:>1 -. L (= __ oF~-~" 11 ~'S _ 11<" Iii"' 2~'-2 _ __~:::.-.-__ 1,(,,7tli;;Jsk ( us -c.?' 5;,) !u r ) ,\ I = _ t,/ .'(,7 wt Page 2 of 3 Initials: ----(XX points) 2. A PMOS-based current source is shown in the figure below. All PMOS devices: k'p = 40 ~/V2; VtPo = -0.6 V; x= 0.2. For Ql, (W/L)l = 10; for Q2, (W/L)2 = 20. JffA For DC calculations, A = 0; for small-signal calculations, A = 0.05 V-I. 5V lkQ Amplifier ? (a) Determine the output current 10, j;(ptsj \fcc::: ./ I - 1"- . \ k \(_ _ ',-j ~~, .J, -C( ~I IldL - O. k) \2- 1;)\) VVl It - .,-1) Z. ..J (b) Determine the maximum permissible output voltage Va,II 4: [i pts} C; -O.(~) " VSJ);f} \1;' ')00 - (, =C_T VTp ) = iJ- ( 3. 3 (c) If Va changes by 1 V, how much does 10change? ~tsj I I~ (II + = r;, '2 --- ~-_._' (\S.5 V .--.--. ! '7 t,! ;1) =- /0. ') I Ul _ Ii ---- ...
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This note was uploaded on 10/23/2009 for the course EE 482 taught by Professor Bowman during the Spring '07 term at RIT.

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MidtermExam#1_2008 - Name: -------------- So L. v1T I t rJ...

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