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Signal excited by square wave

  1. Sep 28, 2012 #1
    1. The problem statement, all variables and given/known data

    11. What kind of frequency components can be observed in the output if a linear system is excited by a symmetric square wave?

    12. What kind of frequency components can be observed in the output if a non-linear system is excited by a symmetric square wave?

    2. Relevant equations

    I have no idea

    3. The attempt at a solution

    Well, all I was given to answer this problem was the following wikipedia page about Fourier transforms http://en.wikipedia.org/wiki/Fourier_transform. I still feel that I am not sufficiently informed to answer these questions.

    I have a test about this in an hour so I please hope somebody can help me out. Thanks a lot.
     
  2. jcsd
  3. Sep 28, 2012 #2

    berkeman

    User Avatar

    Staff: Mentor

    Well, what is the frequency spectrum of a symmetric square wave? What harmonics are present, and how do they fall off with frequency?

    When you have a linear system, what does that mean in terms of how it can affect the fundamental and the harmonic components?

    And if you have a non-linear system (think of a diode in the circuit), what can you say about what can happen to the fundamental and the harmonics, in terms of amplitude and frequency effects?
     
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