a circuit devised of an op-amp configured as a comparator and given a positive feedback. The Schmitt trigger employs hysteresis in order to create a switching voltage which is less susceptible to noise than a straight switch.
an input circuit of a measuring instrument that generated a two state output depending on whether the input is above or below a threshold. The circuit response always includes some hysteresis to improve noise immunity
a binary trigger circuit made up of a comparator with hysteresis