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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 opamps
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 Tmodel and draw
the smallsignal 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 UppzdIOV g
’ , R
R6. . p ' I :0195‘
I;0)‘1>’/M 1‘? “'9 N; : +15: Mx 'D_[‘?§‘;—I,6ZV a”?
D 5 #3 Rows, 'tha /
+27.)
PEV‘do— IZS’xizzIL +3
VPS=6~0 [asX/gaLI 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 10 at the bias point. (c) If terminal Y is grounded,
ﬁnd the voltage gain from X to Z with Z opencircuited. (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 IgtluuIIO,
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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 Fall '97
 Cahay
 Integrated Circuit, Transistor, Bipolar junction transistor, voltage gain

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