need help with frequency spectrum of triangle wave

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

  1. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    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.
     
    • tri.png
      tri.png
      File size:
      20.9 KB
      Views:
      45
  2. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
  3. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    yes, I Did...Did I do something wrong n posting the question?
    Sorry if i I did that.
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    How about the whole, "then post your thoughts and efforts" part?

    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!
     
  5. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    I have done the square wave...here is picture of wave signaltime domain to frequency domain...not sure how to do the triangle wave.
     
    Last edited: Oct 31, 2012
  6. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    Well, how did you get your answer for the square wave?

    What's different between the square wave and the triangle wave that is preventing you from using the same process?
     
  7. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    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
    20,765
    2,536
    Wikipedia has it pretty much spelled out in clear precise detail. I've looked it up accidentally.

    Reading is your friend, always.
     
  9. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    So it would seem that you should try to figure out a suitable equation for the triangle wave and then proceed as before.
     
  10. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    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...
    thanks for your time.
     
  11. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    can you kindly send me the link bro...thx a lot...
     
  12. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
  13. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    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.
     
  14. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    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...
     
  15. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
  16. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    is it the triangle wave signal should look some thing like this...not sure?
     
  17. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
  18. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    How did you get this? What is it about showing your work that you simply refuse to do?
     
  19. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    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?
     
  20. ronybhai

    Thread Starter Member

    Sep 18, 2012
    97
    0
    is Vout, is equal to the input amplitude of the harmonic, Vin, multiplied by the filter attenuation
    Vout=Vin*Av at F0
     
Loading...