MIXED-MODE SCHMITT TRIGGER EQUIVALENT-CIRCUIT

A circuit implementing the regenerative comparator or Schmitt trigger function is presented. While the traditional Schmitt trigger implements the hysteresis levels by means of positive feedback in an analogue loop, our circuit implements hysteresis by digitally processing the output of two comparators operating in open-loop mode. The threshold levels of the new circuit can be independently set and fine-tuned which is not the case in many traditional Schmitt trigger implementations.