Clock harmonics

  • Thread starter cyclone24
  • Start date
If I look at the fourier transform of the square wave signal, the peaks are at the odd multiples. In the device that I am working on, I would expect the interference at the odd harmonics of the center frequency.

But I see the interference at even harmonics. When is this possible?

(Only if the square wave is not really square?)
 
The harmonic structure of a pulse signal depends on the duty-cycle. A real 50% square wave has the odd-harmonic structure you mention. Varying the pulse-width will produce different harmonics.
 
It turns out that the difference in rise and fall times lead to different harmonics (odd/even)....
 

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