need help with frequency spectrum of triangle wave

Discussion in 'Homework Help' started by ronybhai, Oct 30, 2012.

Sep 18, 2012
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Calculate Vout (f0) , Vout (3f0), Vout(5f0), and Vout(7f0) of the frequency spectrum of a triangle wave shown below (A = 10 V and T = 1 ms) passed through a low-pass R-C filter (R = 10 kΩ and C =5 nF).

I need to sketch the input and output waveforms resulting from the first 4 harmonics (for simplicity ignore the phase shift experienced by each harmonic)

Thanks for taking the time to help. Really appreciate
it.

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2. WBahn Moderator

Mar 31, 2012
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Sep 18, 2012
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yes, I Did...Did I do something wrong n posting the question?
Sorry if i I did that.

4. WBahn Moderator

Mar 31, 2012
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I don't see any indication of any effort whatsoever.

Item 3 in the sticky says to include:

> A description of your homeworks objectives.
> The problems you’ve identified.
> The steps you have taken to date, to overcome the problem; including any research and work your have already undertaken.

You provided the first. Where are the second and third?

Without this information, how are we to have any kind of a clue as to whether your problem has to due with understanding what harmonics are, or what the harmonics of a triangle wave are, or what the power spectrum of each harmonic is, or something else entirely? We are NOT mind readers!

Sep 18, 2012
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I have done the square wave...here is picture of wave signaltime domain to frequency domain...not sure how to do the triangle wave.

• square wave.png
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Last edited: Oct 31, 2012
6. WBahn Moderator

Mar 31, 2012
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What's different between the square wave and the triangle wave that is preventing you from using the same process?

Sep 18, 2012
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for the square wave we was given a equation rather thn here is given waveform...n have calculate the V(t) right?

8. Wendy Moderator

Mar 24, 2008
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Wikipedia has it pretty much spelled out in clear precise detail. I've looked it up accidentally.

9. WBahn Moderator

Mar 31, 2012
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So it would seem that you should try to figure out a suitable equation for the triangle wave and then proceed as before.

Sep 18, 2012
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not sure how to come up with an equation from the diagram...if you know can you help me out...thx a lot...
since for the square wave we did...the equation was given...

Sep 18, 2012
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can you kindly send me the link bro...thx a lot...

May 11, 2009
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13. WBahn Moderator

Mar 31, 2012
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Is that ANYTHING that you think it is reasonable for us to expect YOU to do in this whole process? Perhaps the reason you can't do things like come up an equation for the triangle wave, if because you have spent so little time doing anything for yourself up to this point.

Sep 18, 2012
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I don't get it what are you trying to say...Can you give any hint on how to start, if you have any clue...that will be great...

Sep 18, 2012
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Sep 18, 2012
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is it the triangle wave signal should look some thing like this...not sure?

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Sep 18, 2012
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18. WBahn Moderator

Mar 31, 2012
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How did you get this? What is it about showing your work that you simply refuse to do?

19. WBahn Moderator

Mar 31, 2012
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Q1) What is the equation for a line that passes through A/2 at t=0 and -A/2 at t=T/2?

Q2) What is the equation for a line that passes through -A/2 at t=T/2 and A/2 at t=T?