Why Does the Eye Diagram Exclude f2?

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Discussion Overview

The discussion revolves around the eye diagram of a digital signal transmitted through a bandwidth-limited transmission line, specifically addressing why certain frequencies (f1 and f3) are included while f2 is excluded. Participants seek clarification on the implications of bandwidth limitations on frequency representation in the eye diagram.

Discussion Character

  • Homework-related
  • Conceptual clarification

Main Points Raised

  • Some participants question why the answer to the eye diagram problem states that only f1 and f3 pass through, while f2 is not mentioned.
  • There is a request for further explanation regarding the exclusion of f2 from the answer, indicating confusion about the frequency domain spectrum of a square wave.
  • One participant suggests that additional research or resources might help clarify the issue, hinting at the complexity of the topic.

Areas of Agreement / Disagreement

Participants express confusion and seek clarification, indicating that there is no consensus on the reasoning behind the exclusion of f2 from the answer.

Contextual Notes

The discussion does not resolve the underlying assumptions about the frequency components of the digital signal or the specific characteristics of the eye diagram in relation to bandwidth limitations.

fran1942
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Homework Statement



draw the eye diagram you would expect to see should a digital signal be passed through a transmission line with a bandwidth limited to three times the maximum bit rate of the digital signal.

the answer is "Only f1 and f3 pass through"

My question is, what about f2 ?
Why does the answer to this question read f1 & f3 rather than f1 - f3 (including f2) ?

Thanks for any clarification.
 
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fran1942 said:

Homework Statement



draw the eye diagram you would expect to see should a digital signal be passed through a transmission line with a bandwidth limited to three times the maximum bit rate of the digital signal.

the answer is "Only f1 and f3 pass through"

My question is, what about f2 ?
Why does the answer to this question read f1 & f3 rather than f1 - f3 (including f2) ?

Thanks for any clarification.

What is the frequency domain spectrum for a square wave in the time domain?
 
Hello, thanks for your help. I have tried thinking about this one, but I still can't understand why f2 is not mentioned in the answer to this question.

If you could please offer some further explanation that would be great.
Thank you.
 
fran1942 said:
Hello, thanks for your help. I have tried thinking about this one, but I still can't understand why f2 is not mentioned in the answer to this question.

If you could please offer some further explanation that would be great.
Thank you.

You didn't address my question/hint. Try Googling my question if nothing still comes to mind...
 

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