# (solution) Class Assignment (TCO 1) For the Zener circuit shown below, if

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Class Assignment
(TCO 1) For the Zener circuit shown below, if Zener Voltage VZ = 10 V, VS = 15 V, the current flowing
through the Zener diode is 30 mA, and R2 = 2 k, determine the value of R1. A. 53.57 ?
B. 142.86 ?
C. 90.91 ?
D. 200 ? Question 2.2. (TCO 2) Which of the following accurately describes the relationship between the collector,
base, and emitter currents in an NPN bipolar junction transistor?
A. IC=IB+IE
B. IB=IC+IE
C. IE=IC+IB
D. IC=IB?IE Question 3.3. (TCO 2) How must the two junctions of an NPN transistor be biased for proper transistor
amplifier operation in a common-emitter amplifier?
A. The base-emitter junction is forward-biased, and the collector-base junction is reverse biased.
B. The base-emitter junction is reverse-biased, and the collector-base junction is forward biased.
C. The base-emitter and collector-base junctions are both forward-biased.
D. The base-emitter and collector-base junctions are both reverse-biased. Question 4.4. (TCO 2) A transistor has ? = 100 and IB = 4 mA A. What is the value for the collector
current, IC ?
A. 160 mA
B. 360 mA
C. 0.4 A
D. 0.24 A Question 5.5. (TCO 3) A power amplifier has a gain of 30 dB and an input level of 2 mV. Assuming that
the input and output impedances are the same, what is the voltage level at the amplifier output? A.
10.333 mV
B. 20.667 mV
C. 63.246 mV
D. 40.44 mV Question 6.6. (TCO 4) What is a difference between BJT and FET?
A. BJT is a unipolar and current-controlled device, whereas FET is a bipolar and voltage-controlled
device.
B. BJT is a bipolar and voltage-controlled device, whereas FET is a unipolar and current-controlled
device.
C. BJT is a bipolar and current-controlled device, whereas FET is a unipolar and voltage-controlled
device.
D. BJT is a unipolar and voltage-controlled device, whereas FET is a bipolar and current-controlled
device. Question 7.7. (TCOs 2, 4) Which statement is true for a common-source FET configuration?
A. Vin is applied to drain and Vout is taken from the gate.
B. Vin is applied to source and Vout is taken from the gate.
C. A FET amplifier configuration in which the source is the grounded terminal.
D. Vin is applied to source and Vout is taken from the drain. Question 8.8. (TCO 5) What is the typical output impedance of an op-amp?
A. 75
B. 10 k
C. 100 k
D. 2 M
9. (TCOs 5 and 6) What is the op-amp circuit shown below? A. Non-inverting amplifier
B. Differentiator
C. Summing amplifier
D. Integrator
1. (TCO 2) For the circuit in the following figure (Figure 3-29, on page 135 in textbook),VCC=16 V, R1=10
K?, R2=4.7 K?, RC=1 k?, RE1=220 ?,RE2=220 ?, RL=220 ? . Determine the DC base voltage VB
2. (TCO 2) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), VCC=12 V,
R1=20 K?, R2=4.7 K?, RC=1 k?, RE1=220 ?,RE2=220 ?, RL=220 ? . Determine the DC current IC
3. (TCO 3) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), VCC=20 V,
R1=10 K?, R2=4.7 K?, RC=1 k?, RE1=390 ?,RE2=390 ?, RL=220 ? . Determine the voltage at the
DC operating point (Q-point) VCEQ . Answer:
4. (TCO 3) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), VCC=18 V,
R1=10 K?, R2=2.2 K?, RC=3 k?, RE1=220 ?,RE2=220 ?, RL=50 K? . Determine the AC voltage gain. Answer:
5. (TCO 3) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), VCC=18 V,
R1=10 K?, R2=2.2 K?, RC=2 k?, RE1=220 ?,RE2=220 ?, RL=35 K? . Notice that the input voltage
Vin is at the point between Rs and C1 . Assume ?ac=?DC=100 . Determine the power gain AP . Answer:
6. (TCO 4) For the E-MOSFET Common-Source Amplifier with Voltage-Divider Bias circuit shown
below (Figure 4-41, on page 207 in textbook), VDD=22 V, R1=10 M?, R2=2.2 M?, RD=3 k?, RS=2.2
K?,C1=0.1 uF, C2=10 uF, C3=0.47 uF . Assume VGS=?2.0 V ; and gm=3000 umho . Determine the
following.
(1) DC source voltage VS
(2) DC Drain voltage VD
(3) The AC output peak-to-peak voltageVout(pp) is input voltage is Vin(pp)=100 mV 7. (TCO 5) For the circuit in the following figure (Figure 6-20, on page 326 in textbook), if Rf=50 K?
and Ri=4.7 K? , determine the closed-loop gain. Answer:
8. (TCO 5) For the circuit in the following figure (Figure 6-24, on page 328 in textbook), if the
closed-loop gain is -10, Ri=2.2 K , determine Rf Answer:
9. (TCO 5) For the circuit in the following figure (Figure 8-7, on page 389 in textbook), if R1=15 K?
and R2=15 K? , and assume +Vout_max=8 V and 1Vout_max=?5 V , determine the hysteresis
voltage. Answer: 10. (TCO 6) For the circuit in the following figure, if R1=470 K?, R2=470 K?, and R3=470 K? ,
determine the value for Rf so that it will function as an averaging amplifier (meaning the output
voltage will be the average value of the input voltages). Answer:
11. (TCO 6) For the circuit in the following figure, if
R1=47 K?, R2=20 K?, R3=15 K?, Rf=10 K?,
V1=1 V, V2=?2 V, V3=4 V , determine the value
12. (TCO 6) For the instrumentation amplifier shown in the following figure (Figure 12-2 on page 549
in textbook), the values for R3, R4, R5, R6 are fixed for a gain of 1 for the differential amplifier. Also,
the values of R1 and R2 are exactly matched for the same value = R = 30K.
(1) Determine the value of RG assuming the voltage gain Acl is 500.
(2) If Vin1=10 mV and Vin2=6 mV , determine the voltage output Vout Answer:
13. (TCO 7) For the low-pass filter shown in the following figure, the frequency response curve is also
shown. If R1=10 K?, R2=20 K?, R=15 K?, C=0.01 uF , determine the following values.
(1) The critical frequency
(2) The Damping Factor (DF)
(3) The voltage gain AV and the voltage gain in dB AV(dB) at 0 (DC), 1, 1000, and 10,000 Hz Answer:
14. (TCO 7) For the circuit shown below, RA=30 K?, RB=30 K?, CA=0.001 uF, CB=0.001 uF ,
determine the critical frequency. Also, if R2=2.2 K? , design the value for R1 to achieve 2nd order 