Thesawtooth wave(orsaw wave) is a kind ofnon-sinusoidal waveform. It is so named based on its resemblance to the teeth of a plain-toothedsawwith a zerorake angle. A single sawtooth, or an intermittently triggered sawtooth, is called a ramp waveform. The convention is that a sawtooth wave ramps upward and then sharply drops. In a reverse (or inverse) sawtooth wave, the wave ramps downward and then sharply rises. It can also be considered the extreme case of an asymmetrictriangle wave.