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Unformatted text preview: ECE 3042 Lecture Exam No. 1 Fall 2003
OCTOBER 3, 2003 FRIDAY 2 PM STUDENT No. Name if Totally Closed Book and Note. Calculator Permitted. Four Equally Weighted
Problems. All Work Must Be Shown for Credit. 1. Shown below is a single stage common emitter ampliﬁer using an 2N3904 NPN BJT
as the active device. Design the circuit so that the dc voltage drop across both RC and Rm
is one third of the dc power supply voltage, V+. The design speciﬁcation for the magnitude
of the small signal midband voltage gain / is 20. For the design calculations assume
that the base—toemitter dc voltage drop is 0.65 V, the dc current in R31 is 1213, ﬂ = 143,
REIHREg >> rig and the Early voltage is inﬁnity. Assume that the thermal voltage is 25.9
mV. Determine the values of the resistors R31, R32, R0, and R32 to satisfy the design
criteria. Determine the dc operating point, i. e. the value of the dc currents and node
voltages (referenced to ground) for the transistor. v E a a v V+=24V \Jcj. f3 [#3 _o,QQZ \ 2. In the circuit shown below determine the currents 11, B, IO and the voltage V0. The
resistors are R1 = 2 k9, R2 = 8 k9, and EL: 2 k9. Assume the op amp is ideal. The
voltages are referenced to ground. 3. Complete the table shown below
has an upper saturation voltage VH =
V but is otherwise ideal. Assume that
biased with a voltage drop of V7 across for the circuit shown below. Assume that the op amp
+15 V and a lower saturation voltage of VL = ~15 each diode is a battery of V7 = 0.65 V when forward
it (or on) and an open circuit (or off) when reversed biased or forward biased with a voltage less than Determine x,
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Vol: (f v‘ 0'65 up 4. Determine the complex transfer function T(3) 2 V0/ for the circuit shown below.
Specify it as a function of the complex frequency, 5, and the symbols for the resistors and
capacitor. Plot the magnitude of the complex transfer function TOM) in decibels as a
function of the frequency f of the source as f varies from 1 H z to 1 M H 2. Assume that the
op amp is ideal. Use as the numerical values for the resistors and capacitors: R1 = 2 k9, RF = 300 k9, R2 = 2 k9, and C’ = 2 nF. Remember:
V A 3; pyii'er Low" 5 helvlr’ﬁ T(jw)dB = 2010g10lT<jw) Number ECE 3042 Lecture Exam 1, October 3, 2003, 23 pm Fé'leeén J'é'leeilenliﬂqf..;.;.:.1.: Hurrjbef1ﬁ'li l  : : 5 : : Sterjderd Deviatien D 5 1U152ﬂ253ﬂ354045650d55 EDEETU TF5 8085 EH3 E35100
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This note was uploaded on 04/17/2008 for the course ECE 3042 taught by Professor Brewer during the Spring '08 term at Georgia Institute of Technology.
 Spring '08
 Brewer

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