EEE4306_QUIZ__1_2010_Summer_Solution

EEE4306_QUIZ__1_2010_Summer_Solution - BEL 4306C QUIZ l,...

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Unformatted text preview: BEL 4306C QUIZ l, 100 Points Name: 60 Minutes. Open Note, Open Book, 5/26/10 UFID . Circuit Values, VSupply = 12V, R31 = 40 K9, R32 =20 KQ, Rs =2 KQ, RD = 3 K9, RL215 KQ, RL2 =15 BJT Parameters, B = 100, VA = 100 V, BJT base-emitter VBBON 2 0.7V, Thermal voltage, Vt = 0.025V MOSFET Parameters, VT = 1 V, k = 250uA/V2 = l/2},LnCox(W/L) , 9» = 0.02. Biasing Calculation: (20points): Find the numerical values for the circuit elements below. 12V‘(fi52‘ _.. lzvv 20“- : L[l/ Find the DC value of Vx= - v @575} ((052-— g ‘4. A—r ~04 ~— ' Pick RE so that IE; 1 mA RE = w : qv q)“: z. 3 (C/L pr>> Pall/£52 flfitfiw M mi. Picchsothath1=VG'=6VRC= DWé" ~ éle . W, wafiym "MN a I . Pf __ _ 1 01¢ PickRgsothatISIElmA R31= Vgs = VT +3)”; ’ /U%/uz’=3\/ 99, : Van" V64. 1: 3V, k :35; Midband Gain Calculation: (55 poinmgie C1, C131 aii'd Cgflthis section of the quiz. These capacitors will short all signals except for DC. Use the values of R51, R52, and R01 from above. We will look at the gain from Vs to Vz in this part. [an M /D t x m» , 4.01 _— 2 If 3 M % [W 5%; LSV WW 7— Input Section Gain: (15 points) Write the expression (equation) for the input section gain Vx/Vs in terms of the circuit elements above. Use the small-signal values of Vx/Vs. Li kJL vX Rel/Kg, fléL \‘ r77 I] exp/um 20 [<71 * : m ‘- vs ’35 + [QL’H/ £3) //{85L— 2* 12/4» 25nd] twin/Beta, Find and report the numerical value of the input section gain 2. ’k/L VX_ 2,5k12/IL/D/r/L/IZok/L fl ;/ VS 2EQ+ 2r5k/UI l/flkflflw/ZQ, 2/ / krz, Stage 1 Gain: ( 15 points) Write the expression (equation) for the stage 1 section gain Vny in terms of the circuit elements above. Use the small-signal values of Vy/Vx. VY __ [ vX _ "3%ch ” @679 = (VA, T ’ barf; @ 9m arr—2 (wt: 6, wow @Tr VT, ’0L‘fi/ é/mfif/l/ ) Kc: 0997/” m Find and report the numerical value of the stage 1 gain :- /DD k12— VY VX 2 yam A/Mg/eu/ MO/QL): szé Stage 2 Gain: (15 points) Write the expression (equation) for the stage 2 gain Vz/V y in terms of the circuit elements above. Use the small-signal values of Vz/Vy R9, // (3/. V I j —Z = I :2 . f VY m, “" Rat/[KL 5M“, 41; .1? Find and report the numerical value of the stage 2 gain : / ’/ 7/6 kn ) :2: 7ku/ 5ka L/r/MA 1293/474/02 vY moofit— gbfl/l’fikfé. / 1 17;?” ’L 2 Z 7‘04, Q »7/ Overall gain: (10 points) Write the expression (equation) for the overall gain Vz/Vs in terms of the circuit elements above. Use the small-Si nal values of V2 anst. #— V_z= X»; W, L; , (gt-#199! V5 V6 17X V)! I pgm // ppm-T) "V Find and report the numerical value of the overall amplifier gain £9, I, K], v2 v ' .__.L» E: 9M”! + PSIHKL. Low Frequency Cutoff for gain Vz/Vs: (25 points). Roughly set the FL of the circuit to 50 Hz by finding values for CE and Cs. Make sure the lowest resistance sees the biggest capacitor. Assume all the other capacitors C1 and CD will be IOHF. What is the final value of your FL’ using this procedure. V g 0 IL! L / CE: 7/799; I sz2'7T‘5Ci: 3/1/ ’ Cs = @- 9:M/ r at L? . _, z 2 mm ., \ (‘1 1.’-'”‘ ,, 7 4‘ ,3 , / '1 r Pg 47» , .—... v , 'Ir ,,‘/ ’ I. ,4, . , '14., ‘ ..-" I. Bonus (5 points): What is the gain of the circuit from Vow/Vs. Assume that VBias supplies the correct voltage for M2 to be in saturation and to have IDZ = 1mA and use a new RL = 1009 next to M1. VOut =«-———~a ...
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EEE4306_QUIZ__1_2010_Summer_Solution - BEL 4306C QUIZ l,...

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