ElectronicsFinal1996Cahay-2 - Final Exam(200 pts 25 pts...

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Unformatted text preview: Final Exam (200 pts: 25 pts each)- Spring 1996 - M. Cahay Name: KEZ ELECTRONICS I June 5, 1996 I. In the circuit below, express two in terms of v1 and 1);. Assume the op-amps are ideal. Calculate vo if 121 = 3ain(2wX60t) + 0.013in(2rX1000t)Volts, (1) and v2 = 3sin(21r)(60t) - 0.01:in(2wX1000t)VoIts. (2) — JV— Show your work. ‘ wk 52 0:; I Wok Q - H. For the circuit shown below, assume all diodes are ideal and calculate 11,I3,I4, and Vth. Show you work. . D- L3l22)3)\l OM L III. For the circuit shown below, find all node voltages (i.e, voltages at the emitter, base, and collector of both transistors). Assume ,8 = 99. Hint: Use Thevenin equivalent and the "loop" equation, starting with the left transistor. +‘W +QV V +QV IV. The npn below has a 3 a 100. (a) Find the dc collector current and the dc voltage at the collector. (h) Replace the transistor by its T-model and draw the small-signal equivalent circuit of the amplifier. Calculate the voltage gain vo/Vi- V. Analyze the circuit below to determine the drain current and the drain voltage. Assume that the depletion MOSFET has V. =—1 V, K : 0.5mA/V’, andA=0u g Uppzd-IOV g ’ , R R6. . p ' I :0195‘ I;0-)‘1>’/M 1‘? “'9 N; : +15:- Mx 'D_[‘?§‘;—I,6ZV a”? D 5 #3 Rows, 'th-a / +27.) P-EV‘do— IZS’xizz-I-L +3 VPS=6~0 [as-X/g-a-LI Jr ~ .< 1‘. Es ’Y‘ 15’ 2+) - a 1%37155 (7 r:- ‘ -— . i _ 6* :5 WE:- Va M; m VI. The MOSFET in the circuit below has V. = 1V, K=0.4mA/V’, and V4 3 40V. (3) Assuming RD 2: 501:0, find 83 and Re so that ID = 0.111111. (b) Find the values of g... and 1-0 at the bias point. (c) If terminal Y is grounded, find the voltage gain from X to Z with Z open-circuited. (d) If terminal X is grounded and terminal Z is connected to a. current source delivering a current of lOpA and having a. resistance of 100 k {2, find the voltage signal at Y. Neglect ro in that case. ea QV/Rs) 2; L4 LL Rfl%>+ygm+, :10 m: [2.1%. (Kb/lWD‘ta’T ’ .: PD 16/: 9J2 XszVS’éuu @ VII. Consider the Wilson current mirror below. Assume all BJT: are matched and have finite fl. Denoting the emitter current of 01 and Q; as I g, find I as; and Io in terms of Is and calculate Io/Ingr. I VIII. For the circuit shown below, assume that for all transistors are matched. Furthermore, [Vggl = 0.7 V and fl is infinite for all transistors. Find Igtlu-uIIO, and V1, V3, V3. Transistor Q. has twice the area of transistor 0;. ._ loA—V —Io.+v “WSW ‘WV LVM€I¢ 5‘7"!" 0 (in/4 w, A 3 I V V In! ...
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