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(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

 

with respect to ground. Answer:

 

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

 

flowing through resistor RC Answer:

 

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

 

of output voltage Vout Answer:

 

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

 

Butterworth response. Answer:

 

15. (TCO 7) For the circuit shown below, R1=15 K?, R2=15 K?, R3=15 K?, C1=0.01 uF, C2=0.01 uF ,

 

determine the values of 1) geometric center frequency; 2) the Q factor; and 3) the Bandwidth. Answer:

 

1. (TCOs 6 and 8) Elaborate on the structure

 

and function of a scaling amplifier. Give an

 

application example.

 

Answer:

 

2. (TCOs 7 and 8) Elaborate on the structure,

 

function, and the characteristics of the

 

frequency response of an active high-pass filter circuit. Give an application example.

 

Answer:

 


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