ET222 Week1-4

WEEK 1

Assignment

Power Amplifiers

Week 1: Work Problems 10-2, 10-6, 10-10, 10-14, 10-18, 10-22, 10-26 pg. 409-411.

Scan all work and save it for upload with the title: "HW1_Student ID", with your

student id substituted in the file name. Show all work for full credit. Upload your file

here.

LAB

Power Amplifiers

INTRODUCTION

Discuss some of the basic differences between the operation of a class A, B and C

amplifiers.

EQUIPMENT

· 1 power supply: 12V

· 1 transistor: 2N3904

· 2 resistors: 1kΩ, 50kΩ

· 3 capacitors: 0.1µF, 0.01µF, 560pF

· 1 inductor: 38.07µH

· Tektronix oscilloscope

· Waveform generator

PROCEDURE

Using Multisim construct the circuit shown below:

Calculate the resonant frequency fr – show your work and record the answer in row 1 of

the table.

a. Use the Waveform generator to produce an input: 2.5Vpk and frequency set to the

resonant frequency.

b. Use the Tektronix oscilloscope to measure fout and record it in the table

c. Take a screen shot of circuit showing the frequency measurement on the oscilloscope.

d. Repeat steps a) and c) for each input frequency in the table.

RESULTS

fin fout

1 fr =

2 1500kHz

3 300kHz

4 546kHz

5 273kHz

6 873kHz

Discuss the results.

CONCLUSION

What is the function of this circuit?

What did you learn?

Please fill out and use the following Lab Report Template when submitting your lab work.

Please read and follow the guidelines given in the Solutions Template in submitting all of

your lab work.

WEEK 2

Assignment

Electronics II and Lab

JFETs

Week 2: Work Problems 11-2, 11-6, 11-10, 11-14, 11-18, 11-22, 11-26, 11-30 pg.

462-464.

Scan all work and save it for upload with the title: “HW2_StudentID”, with your student

id substituted in the file name. Show all work for full credit.

Upload file “HW2_StudentID” here.

LAB

JFETs

INTRODUCTION

Which types of applications are field-effect transistors preferred over bipolar junction

transistors? Why?

Explain why junction field-effect transistors are considered voltage-controlled devices.

EQUIPMENT

· 1 power supply: 15V

· 1 transistor: 2N4860

· 3 resistors: 1kΩ, 4.7kΩ, 2MΩ

· <List meters used>

PROCEDURE

Using Multisim construct the circuits shown below:

Measure the following and record the values in the “results” section: VG, ID, VS, VD, VDS,

RESULTS

Calculate VGS from the measured values.

Which type of biasing is used?

The table below shows readings for three different cases where the circuit above, was

malfunctioning. Find the fault, assuming only one device in each case has a problem.

List the steps taken to arrive at a solution.

VDS VD VS What is the problem?

1 91.4mV 91.4mV 0V

2 66.5mV 15V 14.9V

3 15 15 0

CONCLUSION

What did you learn?

WEEK 3

Assignment

MOSFETs

Week 3: Work Problems 12-2, 12-6, 12-14, 12-18, 12-22, pg. 516-519.

Scan all work and save it for upload with the title: “HW3_StudentID”, with your student

id substituted in the file name. Show all work for full credit.

Upload file “HW3_StudentID” here.

LAB

MOSFETs

INTRODUCTION

Discuss the basic differences between JFETs and MOSFETs.

Why should MOSFETs be handled with special care?

EQUIPMENT

· 1 power supply: 15V

· 2 transistors: MTP10N05E/MC, IRF510

· 1 resistor: 470Ω

· 1 potentiometer 500kΩ

· 1 diode: red LED

· <List meters used>

PROCEDURE

Using Multisim construct the circuits shown below:

a. Set the potentiometer to 0% then measure and record VGS, ID, VD.

b. Set the value to 45% and take the three measurements.

c. Increase the potentiometer until the LED turns off, record the readings.

d. Replace the transistor with the IRF510 and repeat steps a) through c).

RESULTS

MTP10N05E/MC IRF510

VGS VD ID VGS VD ID

0%

45%

LED off

Discuss the results.

What types of applications can this circuit be used in? Explain.

CONCLUSION

What did you learn?

WEEK 4

Assignment

Frequency Effects

Week 4: Work Problems 14-2, 14-6, 14-10, 14-14, 14-18, 14-30 pg. 618-620.

Scan all work and save it for upload with the title: “HW4_StudentID”, with your student

id substituted in the file name. Show all work for full credit.

Upload file “HW4_StudentID” here.

LAB

Frequency Effects

INTRODUCTION

What are Bode plots? Use a well labelled diagram to aid your explanation.

Calculate the input-coupling circuit and output-coupling circuit low-frequency cutoff

points for the circuit shown below.

EQUIPMENT

· <List all devices and meters used>

PROCEDURE

Using Multisim construct the circuits shown below:

a. Connect the Bode Plotter as shown, and use the setting in the figure. Set the function

generator amplitude to 5mVp and 10Hz.

b. Attach the Tektronix oscilloscope channel 1 to measure peak-to-peak voltage across the

function generator, and channel 2 to measure the peak-to-peak voltage across the load

RL. Record both values in the results section, and use them to calculate the voltage gain

in decibel – show ALL work.

c. How does the calculated voltage gain compare to the midband gain from the Bode plot?

d. Using bode plotter cursor to mark and measure the low and high cutoff frequency,

calculate the bandwidth.

RESULTS

Show all screen shots – that prove all meter readings.

Record measured values and calculations in this section.

What types of applications can this circuit be used in? Explain.

CONCLUSION

What did you learn?

MIDTERM Week 4 Midterm

WEEK 5

Assignment

Differential Amplifiers

Week 5: Work Problems 15-2, 15-6, 15-10, 15-14, pg. 661-662.

Scan all work and save it for upload with the title: “HW5_StudentID”, with your student

id substituted in the file name. Show all work for full credit.

Upload file “HW5_StudentID” here.

LAB

Differential Amplifiers

INTRODUCTION

Discuss at least three very important characteristic of differential amplifiers.

What do the terms inverting and non-inverting mean in the context of amplifiers?