quiz 3 solutions - Name § 6 ‘u h‘QMS ECSE 2050...

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Unformatted text preview: Name § 6 ‘u h‘QMS ECSE 2050 Introduction to Electronics Spring 2007 Quiz 3 Print you name on every page, show all work to ensure gartial credit. Problem 1 (20 points) Problem 2(25 points) Problem 3(25 points) Problem 4 (30 points) Total Name: A Problem] (10mg) (21) For the circuit shown below, find V1, V2, and V3 using 6:100 S" .. IE, :: .. aam4kurs) (sen W“ 5:: — \\"\"\£m(_\ it: new V \l o __ 1% (mm .0 13V ‘: (9.9.x); 4034 Q a ssu w- FROM 2 VcE : mm> oz 0.2% V1: - V2=-- Name Problem 1(1)) (10 points) For the circuit shown below, find the labeled node voltages for fl = 00 +lGV Name: Problem 2 (25pts) For the circuits shown below, answer the following questions using 18:100. t l 531% E 301m g E “W g .5 $53 (a) Find the DC collector current 1c of transistor Q1 1E : 033*“ \j) 1C; «LE : WWW-33v»: °-324~A lol (b) Draw the small signal model at the midband frequency range, label all resistances andactivesources. SN: IQ, ' 0 .0‘3 r.“ ; "I <9 VT Name: (c) Find the input resistance Rin ) RM Gr _. 146k jean 9‘ 9+ ((1) Find the voltage gain izo/vsig Vg Rtm x jw(RC “Vs-:3: ‘2' Rs: - $5.23 x (liar-H 3”” "SM - W ‘KCB +3? 5. q .33le (e) Given that the low frequency breakpoint fL=155Hz. If you apply a sinusoidal signal at the same frequency with peak amplitude of lOOmV, what will be the amplitude and phase of the signal at the output. 0| . 3 3 Eva \ Men, 4.44 Veal-.2 ctmwv (f) If you increase the frequency of the input sinusoidal signal such that the amplifier is operating at midband frequency range, plot the voltage signal at the base of the transistor (node Vx ) as function of time. «x \a m mans-w of? J Oi (M 3W“) Name: Problem 3 (25) Given: Vd 2 V1 -— V2 ch 3 (V1 + V2)/2 The transistors have fl = 100, and VA = 50V 15v (a) Neglect the effect of the output impedances of transistors Q3 and Q4. Find gm, and rn 0ftransistors Q1 and Q2. 5/; \2 lg (Q33 4: 3. ’45-!“ P [w «A no “(01: x: LEH’ IE2, -' a-LtS’ L“ I 194 :, 12E 2 2 L22 8" ' ‘ swfi" $‘Mz: L-l‘Zh-fiiV fix (b) Draw the differential mode 1/2 circuit model “fit 46L :9 (0) Determine the differential voltage gain, Avd (V01/ Vd). VM _ .. FClok //‘tek//4i.ék\ VA]: 1"“ 4 (H'fi) CW) ._ ii. 3.25“ (d) What is the differential input resistance for this circuit, Rid? Rh“: 2 Lrn+0+FJm1 _ L[2.o3—t "‘1 2,66.\C \L-SL— 3’ (e) Draw the common mode 1/2 circuit and determine the common mode gain, Avcm V, b lo“- W I Pb teKHre‘ tWI‘L Eur-t1” (loll/r"A W. V: = i/ Wm rw+ (\-&F)(flk+zr¢) 2"” - _. a. o 17- O.— (f) What is the common-mode input resistance for this circuit 2. \o\(‘32-3v‘\ '7 , _ Ran»: , 2,.03k-t (g) ifv1=015in27r60t+0005 - - . 51:12 1 z - . V01 and V02 7T 000t and V2 0.151n27r60t-O.00531n27rIOOOt, find V0. ; AA (VHV-Q + Ram (VHsz 2. ~3.2§(o-o\ SWs 2w heck) - o.Oq—4(o.\ '3‘“ 2* (cfl') v7 Name: m Problem 4 (30) Consider the multi—stage amplifier below. The DC collector current 1C for Q1 = 5mA, and for Q2=2mA. Set 8:200, R1//R2=20KQ, R3//R4=50KQ, fT=400MHz, and Cy=2.5pF 20V 6K0 (3.) Determine the mid-band voltage gain for the whole amplifier Vout/ Vsig. Show your steps clearly to maximize partial credit. For (29‘ lgasflxk 3M3: 1v“ a WEE“; @ : liaise JRVMP' Alf-5 rn :Qfisk gar 49L iv»; = as” : ‘30» 1 4‘?” _____——N—-—--" a M’ CE. L1" c8 5“- i' \lx, MM “3/ “Jr " _\_.I..°_:—-- I V‘“ t " Vx V563 \l____°“k —+ z Vat ' rm. : RI). 3/ {M3 {V ’ Name: W‘s @ (b) Estimate the lower 3dB frequency fL for the multi—stage amplifier. Again Show your Steps Clearly to maximize partial credit F C C‘(Qk+ R\//Rz/lrm\ QM \ 7." ...- _3 i M” g \‘h? L m in. 30‘ l" .3... “3.13. “E R\//Rz./ T. fix) l 2“ T‘ : 3°)” F ( I“ 2.! L” aux/MUN ,3 (0) Estimate the upper 3dB frequency fH, for the multi—stage amplifier. Again Show your steps clearly to maximize partial credit 11 Name: ((1) If a IOOKQ resistance is connected between the two nodes (Vout and Vin), what would be the new value for input resistance Rm Mafia» ,..__./\J M Av‘ 7- 45>” F PRQV“: VOW r QKLIJ’” 12 ...
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quiz 3 solutions - Name § 6 ‘u h‘QMS ECSE 2050...

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