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Unformatted text preview: Last Name: ECE 3254
Industrial Electronics
Term Test #2 October 29, 2007 1. Read all of these instructions and follow them carefully or 5
points will be deducted from your grade for each time you do not comply. 2. Your test consists of 2 problems taken from a set of 7 problems. All
7 problems are used and students have different problems. Each
problem is worth 50 points. You must work the problems on the
paper provided. Start each problem on a new sheet of paper and do not: write on the back of any paper. 3. You may use one 8 1/2 by 11" sheet of paper with equations and
other information. It may not have problems worked out in any
form and it may not have any circuits on it. It may be written on front and back. Put your name on this and hand it in with your test or write a statement on this sheet that you did not use an eguation sheet.
4. All work on this test is to be your own. You will neither give nor accept help from any other person. 5. Show all of your work ! Sign the following pledge before turning in your paper.
I pledge that the work on this test is totally my own and that I have neither given nor received help. I also pledge that I will not pass information, in any form, concerning this test to anyone who has not
yet taken the test. Print Name Signature Problem # 1 Shown below is a transistor ampliﬁer circuit. The characteristic curves
for the transistor are attached. The load lines and Qpoints are shown on
the curves. Using these curves, determine the values for RC, Rb, Vcc, Vbb,
and the peak value of the input signal, Vs. Also determine the AC voltage
gain for the ampliﬁer. é" The following transistolj ampliﬁer circuit is used for Problems 2, Re.
ca
23 C: o ‘
' _ +
'5 v.2”; R» 3, and 4. M For the trmitor ampliﬁer circuit given, drew the DC equivalent
circuit and insert the urgesignal activeregion model for the
trellistor. Use V“ = 0.7 v and B = 230. Calculate the DC bias point values of 1;, van, and Ic for the following
cireﬁt element values: Vcc=~20v Rs=soo ~0—
Rc=1K ﬂ RE=1K #
R1=300K 1‘ C1=C2=C3=1000nf
R,=200K 4'— RL=2K 1! v, = 0.1m (wt) v Determine if the activeregion model is the correct model for the
values gven. . M For the transistor ampliﬁer circuit given, draw the AC equivalent
circuit and 'msert the smellsignal model for the transistor. Use
1' = 631‘“ andﬁ = 230. Axele C1,C2, and C3 are short circuits for the frequency ofthe AC
source ml and thath looks like a shortcircuitto the'AC signals. Use this model to calculate the AC voltage gain of (v...lv.) for the
following circuit element values: Vcc=20v Rs==1000 ‘°"
Rc=RE= 1K“ v.=0.lsin (wt)v
R1: 300K ‘a' C1=C2=C3=1000nf R2=ZWK ‘a' RL=10K 'n' Darheﬂthisisorisnotthecorrectmodclforthefoﬂowing
circlitMvalucs: Vcc=15v Rs=1000 1'
RC=RE=10K 41 v.=0.lsin(wt)v
R1= 100K 4'— C1=C2=C3=1000nf
115200le RL=10K 1L Dearinc 13, 1c, IE, and Van. For the opentional ampliﬁer circuit shown below, dgtermine the You may mume the opamps are not saturated. M A. For the operational ampliﬁer shown below, determine the
value of V0“ when Vs = 4m volts. _ ' You may assume the opamps are not saturated. B. Determine the overall gain of the circuit out/ V.) Problem # 7 Sketch both the transfer function (Vout vs. Vin) and the output
waveform if Vin(t) = 15 sin(w' t) for both of the circuits shown below. Circuit (21) ’ Circuit (b) (b) ...
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This note was uploaded on 04/07/2008 for the course ECE 3254 taught by Professor Gfreid during the Spring '08 term at Virginia Tech.
 Spring '08
 GFReid

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