Schmitt Trigger

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What is Schmitt Trigger?

A Schmitt trigger is a comparator circuit that incorporates positive feedback producing two distinct switching thresholds. It was invented in 1934 by American scientist Otto Schmitt to reduce problems arising due to small input signal variations thresholding digital circuits.

The main factors of a Schmitt trigger include:

  • Hysteresis: It exhibits two different switching threshold voltages for the rising and falling signal edges due to positive feedback.
  • Noise elimination: The hysteresis eliminates minor noise and fluctuations in the input signal.
  • Square wave output: A Schmitt trigger converts analog signals like sine waves into clean digital square waves.

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