[mtreis86]

This, for reference see the book High Speed Digital Design by Hall Hall and McCall https://archive.org/details/highspeeddigital0000hall/ The sharper the edge of the digital pulse, the greater the strength of the AC high frequency components. A perfect square wave is the sum of the infinite series of odd harmonics of a sine wave with the same wavelength.

[SV_BubbleTime]

I watched a video recently that had another author describe issues in a way that I found very intuitive. https://www.youtube.com/watch?v=kdCJxdR7L_I