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ECET210 Week 6 iLab with Questions | Complete Solution
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Laboratory Procedures
DeVry University
College of Engineering and Information Sciences

 

I.OBJECTIVES

  1. To analyze a RC Low Pass Filter using simulation and circuit measurement.
  2. To analyze a RC High Pass Filter using simulation and circuit measurement.
  3. To analyze a LC Band Pass Filter using simulation and circuit measurement.


II.        PARTS LIST

Equipment:

           IBM PC or Compatible                      

                             Function Generator 

                        Dual Channel Oscilloscope

                       

Parts:  

1 - 50 Ω Resistor                     1 - 470 nF, 50 V Capacitor

            1 - 330 Ω Resistor                   4 - 47 µF, 35 V Capacitor

                                4 - 4.7 mH Inductor                 2 - 100 µF, 25 V Capacitor

                        1 - 470 mH, Inductor


Software:

            MultiSim 11

 

III.       PROCEDURE

  1. Simulation of RC Low Pass Filter |

    1. Enter the circuit shown in Figure 1 in MultiSim.

 

Figure 1 - Low Pass Filter

 

  1. Set the function generator voltage, VIn = 1 VP.
  1. Simulate the circuit shown for various frequencies indicated in Table 1 below. Record the output voltage, VOut, for each frequency and calculate the gain using the formula: 20 log(VOut P-P / VIn P-P).

 

Frequency, Hz

VOut P-P

GaindB

Frequency, Hz

VOut P-P

GaindB

100

 

 

2000

 

 

200

 

 

4000

 

 

400

 

 

8000

 

 

800

 

 

10000

 

 

1000

 

 

 

 

 

 

Table 1 – Low Pass Filter Frequency Response Simulation Data

Low

  1. Determine the voltage “Gain/Loss” in dB for the frequency response plot. Plot the simulation data of on the semi-log graph sheet below. The frequency must be on the X axis and the GaindB on the Y–axis.

 

  1. What is the 3 dB cutoff frequency from the plot?


fC =___________________

  1. Calculate the 3 dB Cutoff frequency using the formula: fC = 1/(2 π R C)

fC =___________________

 

  1. Does the simulated measurement agree with the theoretical calculation?

 

Yes ______ No ______

 

B.        Simulation of RC High Pass Filter

 

  1. Enter the circuit shown in Figure 2 in MultiSim.

Figure 2 - High Pass Filter

 

  1. Set the function generator voltage, VIn = 1 VP

 

  1. Simulate the circuit shown for various frequencies indicated in Table 2 and record the output voltage and gain.  

 

Frequency, Hz

VOut P-P

GaindB

Frequency, Hz

VOut P-P

GaindB

100

 

 

2000

 

 

200

 

 

4000

 

 

400

 

 

8000

 

 

800

 

 

10000

 

 

1000

 

 

 

 

 


Table 2 - Low Pass Filter Frequency Response Simulation Data

 

  1. Determine the voltage “Gain/Loss” in dB for the frequency response plot. Plot the simulation data of on the semi-log graph sheet below.
  2. What is the 3 dB cutoff frequency from the plot?


fC =___________________

  1. Calculate the 3 dB Cutoff frequency using the formula: fC = 1/(2 π R C)

fC =___________________

 

  1. Does the simulated measurement agree with the theoretical calculation?

 

Yes ______ No ______

 

C.        Simulation of LC Band Pass Filter

 

  1. Enter the circuit shown in Figure 3 in MultiSim.

 

  1. Setup the function generator voltage, VIn = 1 VP.

 

  1. Simulate the circuit shown for various frequencies indicated in Table 3 and record the output voltage and gain.

 

Frequency, Hz

VOut P-P

GaindB

Frequency, Hz

VOut P-P

GaindB

200

 

 

340

 

 

250

 

 

344

 

 

280

 

 

348

 

 

290

 

 

355

 

 

300

 

 

352

 

 

320

 

 

356

 

 

324

 

 

360

 

 

330

 

 

 

 

 

 

Table 3 – Band Pass Filter Frequency Response Simulation Data

 

  1. Determine the voltage “Gain/Loss” in dB for the frequency response plot. Plot the simulation data of on the semi-log graph sheet below.

 

  1. What are the 3 dB cutoff frequencies from the plot?


Upper fC =_____________   Low fC =_____________  

 

  1. The LC band pass filter is PI- Section filter which has been designed using the website:

 

http://www.raltron.com/cust/tools/band_pass_filters.asp

 

The filter has been designed to operate at a center frequency, fo of 340 Hz and a 3dB Bandwidth of 10% of fo.

 

Log in to the above website; feed the data of center frequency and the bandwidth desired. Verify if the design values chosen for the lab experiment are close enough.

 

  1. What are the calculated 3 dB cutoff frequencies?


Upper fC =_____________   Low fC =_____________  

  1. Do the simulated measurements agree with the theoretical calculations?

 

Yes ______ No ______

 

  1. Increase or decrease the center frequency by 5 and recalculate the element values. Note and record the new design parameters. What can you comment on the new design values when compared with the original values?

 

  1. The filter can be reconfigured to a T–type using the transformation shown below:
   

Some useful formulas for the Constant K type band pass filter design:

Bandwidth = f2 – f1

 

 

 

 

 

 

 

 

 

Source for the above formulas: “HANDBOOK OF LINE COMMUNICATIONS”, A Royal Signals Pub., 1947.

 

Using the suggested transformation, change the original PI type filter to T-type and simulate to verify if it works as the original. Include the new filter topology below here

 

  1. Did the filter work as the original?        YES             NO

 

D.        Breadboard Construction of the three Filters

  1. Build the three filters simulated above on a breadboard, one at a time

 

  1. Use a Function Generator to excite the filters and check for the pass band and the cut off frequencies.

  2. Submit a photograph of each of your working circuits (online) or have your instructor sign-off each circuit (onsite).

 

Laboratory Report Cover Sheet
DeVry University
College of Engineering and Information Sciences

Course Number: ECET210

Professor:

Laboratory Number: 6

Laboratory Title: Frequency Response of Low Pass, High Pass, and Band Pass Filters

Submittal Date: Click here to enter a date.

Objectives:

Results:

Conclusions:

 

Team:

 

 

 

 

 

 

Name

 

Program

 

Signature

 

 

 

 

 

 

 

Name

 

Program

 

Signature

 

 

 

 

 

 

 

Name

 

Program

 

Signature

 

Observations/Measurements:

 

III. A. 3. Low Pass Filter Frequency Response:

 

Frequency, Hz

VOut P-P

GaindB

Frequency, Hz

VOut P-P

GaindB

100

 

 

2000

 

 

200

 

 

4000

 

 

400

 

 

8000

 

 

800

 

 

10000

 

 

1000

 

 

 

 

 

 

III. A. 4.  Low Pass Filter Frequency Response:

 

 

III. A. 5.  Low Pass Filter Simulated Cutoff Frequency:

 

                fC =___________________

 

III. A. 6.  Low Pass Filter Calculated Cutoff Frequency:

 

                fC =___________________

 

III. A. 7.  Low Pass Filter Simulated Versus Calculated Cutoff Frequency:

 

            Match:      Yes     No

III. B. 3. High Pass Filter Frequency Response:

 

Frequency, Hz

VOut P-P

GaindB

Frequency, Hz

VOut P-P

GaindB

100

 

 

2000

 

 

200

 

 

4000

 

 

400

 

 

8000

 

 

800

 

 

10000

 

 

1000

 

 

 

 

 

 

III. B. 4.  High Pass Filter Frequency Response:

 

III. B. 5.  High Pass Filter Simulated Cutoff Frequency:

 

                fC =___________________

 

III. B. 6.  High Pass Filter Calculated Cutoff Frequency:

 

                fC =___________________

 

III. B. 7.  High Pass Filter Simulated Versus Calculated Cutoff Frequency:

            Match:      Yes     No

III. C. 3. Band Pass Filter Frequency Response:

 

Frequency, Hz

VOut P-P

GaindB

Frequency, Hz

VOut P-P

GaindB

200

 

 

340

 

 

250

 

 

344

 

 

280

 

 

348

 

 

290

 

 

355

 

 

300

 

 

352

 

 

320

 

 

356

 

 

324

 

 

360

 

 

330

 

 

 

 

 

 

III. C. 4.  Band Pass Filter Frequency Response:

 

III. C. 5.  Band Pass Filter Simulated Cutoff Frequencies:

 

                Upper fC =_____________   Low fC =_____________  

 

III. C. 7.  Band Pass Filter Calculated Cutoff Frequencies:

 

                Upper fC =_____________   Low fC =_____________  

 

III. C. 8.  Band Pass Filter Simulated Versus Calculated Cutoff Frequency:

 

            Match:      Yes     No

III C. 9. Modified Center Frequency:

 

Comment on new design values:

III. BC. 11. T-type Band Pass Filter:

 

Did the filter work as the original?        YES             NO

 

Questions:

 

  1. Did the filters work exactly like the simulation data?

 

 

YES /   NO

Reasons for Noncompliance with Simulation

Low Pass Filter

 

 

High Pass Filter

 

 

Band Pass Filter

 

 

 

Grade:

Deliverable

Points Available

Points Achieved

Laboratory Cover Sheet

8

 

Working Circuit(s)/Program(s)

8

 

Observations/Measurements

6

 

Questions

8

 

Total Points

30

 

 

Comments:

 

 

 

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ECET210 Week 6 iLab with Questions | Complete Solution
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