ECE 363Lab 3 ReportFall 2016
Lab 3: Optical Communication Link
Your Name
Your Major
Your Minor or Second Major (if applicable)
Union College
ABSTRACT
This is the template for your lab report. Except for section headings (e.g. ABSTRACT), delete all instructions and replace with your own text. Margins are 1-inch all around. Each page should have a header and page number. All text is in Times New Roman font with a line-spacing of 1.5. The title is bold-faced, 18 pt, and centered. The main body text is in 11 pt font. The author entry is bold-faced and centered. The author affiliation is also centered. The abstract should be relatively short (e.g. seven lines or so). Summarize the goals of your lab work. The last sentence or two should describe your opinion on how you benefited from the lab (e.g. measuring frequency response).
1. INTRODUCTION
Show a block diagram of the entire system (e.g. Fig. 1 from Lab3b handout). Briefly describe the basic idea behind the PWM-based optical communication link (e.g. how is signal encoded, transmitted, received, decoded).
2. HIGH-PASS FILTER
2.1 Design
Briefly describe the design requirements and components you ended up choosing for the high-pass filter. Attach hand-written high-pass filter calculations to the end of the report as “Appendix A”.
2.2 Testing
Show the MATLAB plot of your filter gain. Does your high-pass filter satisfy the design requirements?
3. LOW-PASS FILTER
3.1 Design
Briefly describe the design requirements and components you ended up choosing for the low-pass filter. Attach hand-written work to the end of the report as “Appendix B”.
3.2 Testing
Show the MATLAB plot of your filter gain. Does your low-pass filter satisfy the design requirements?
4. PREAMPLIFIER
4.1 Design
Briefly describe the design requirements, type of amplifier (e.g. non-inverting or inverting), and components you ended up choosing for the preamplifier. Attach hand-written work to the end of the report as “Appendix C”.
4.2 Testing
· Show the MATLAB plot of your preamplifier gain. Does your preamplifier satisfy the design requirements?
· Based on your plot, what is the -3 dB bandwidth of your preamplifier? Is it in reasonable agreement with the small-signal bandwidth (e.g. BW = funity / |G|)?
5. POWER AMPLIFIER
5.1 Design
Briefly describe the design requirements and components you ended up choosing for the power amplifier. Attach hand-written work to the end of the report as “Appendix D”.
5.2 Testing
Include the measurements necessary to answer the following:
· Show the MATLAB plot of the Class B push-pull stage output.
· What is the obvious feature in this plot?
· Next, show the MATLAB plot of the op amp + Class B stage output.
· What can you say about the benefit of combining the op amp with the Class B stage?
· Finally, show the MATLAB plot of your power amplifier frequency response.
· Does the low frequency cut-off satisfy your design requirement?
6. PWM TRANSMITTER AND RECEIVER
6.1 Design
Briefly explain how the PWM transmitter and photodiode amplifier work.
6.2 Testing
Include the MATLAB plot of the photodiode amplifier output (e.g. from Part 1 of Lab3e).
7. OVERALL SYSTEM TESTING
Include the measurements necessary to answer the following:
· Did you successfully hear music with your system?
· Could you hear distortion in the audio output (there probably was)?
Ø NOTE: Information distortion is obviously a concern in communication link design.
· If you blocked the optical beam, did the music go away (it should)?
· MATLAB plot of the high-pass filter output.
· MATLAB plot of the low-pass filter output.
· MATLAB plot of the preamplifier output.
· MATLAB plot of the speaker output.
8. CONCLUSIONS
Overall, did your circuits satisfy the design requirements? If not (and this is perfectly OK), what lessons did you learn about the design/testing process? Also write about any concepts or valuable lessons you learned in the lab assignment (e.g. plotting frequency response, using bypass capacitors). If possible, discuss how they relate to other aspects of the course or to circuit design in general. Your conclusion section should NOT be a summary of your results or tasks you had performed. The conclusion is supposed to reveal what you have LEARNED from your lab experience.
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