Relationship of pulse response to frequency, help

Discussion in 'Homework Help' started by terrakota, Sep 16, 2005.

  1. terrakota

    Thread Starter Well-Known Member

    Feb 8, 2005

    I'm studing that relationship but i cant figure out how to solve a simple problem from my book:

    What is the highest frequency component in the output of an integrator with t=10 micro seconds? assume the 5t < tw.(5 time constanst is < than pulse width).
    i know the formula fh = 0.35/tr, but my answer is not right, any idea?.

    the book answer is 15.9 khz, but i dont know how to achieve that result.

    please excuse my poor english and thanks for any help.
  2. Brandon

    Senior Member

    Dec 14, 2004
    Is that the actual question from the book?

    Also, what subject, it may give us an idea how you need to solve it. Technically, a pulse has tons of frequency components. Numerous harmonics at odd intervals, very much like a triangle wave but with a different set of coefficients, but convoling the pulse with an integrator is going to filter out many of the higher frequencies.
  3. terrakota

    Thread Starter Well-Known Member

    Feb 8, 2005
    yes its the book question,
    the subjet im studing is "pulse response of reactive circuits" from the book "principles of electric circuits" by FLOYD

    thanks for reply
  4. aac

    Active Member

    Jun 13, 2005

    I'm gussing 10 uS is the time constant and that your integrator is just an RC circuit, because of the description of the course given. The 3db frequency of the RC circuit would be given by:

    f = 1/ 2*pi*RC

    Good luck.