What is a triangle-wave voltage function?

Triangle-wave voltage signal is a periodic signal that always has a constant positive and negative slope and no zero slope. It is exactly how it is sounds... a triangle shaped wave.

/\/\/\/\/\/\/\/\/\/ - just like that.

Nothing in this world can naturally produce perfect triangle waves. Every vibrates as periodic sinusoid. Triangle waves can be generated from sin waves with the use of Fourier Series.

http://en.wikipedia.org/wiki/Fourier_series

By summing sin waves with different periods nearly any time-continuous signal can be created.

-VM