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Schmitt trigger

A Schmitt trigger is a feedback threshold circuit, a differential amplifier or an operational amplifier, where the input signal is applied to one input and the threshold voltage to the other. In the case of the Schmitt trigger, the feedback is a positive feedback, i.e. the feedback signal is coupled in phase with reduced amplitude to the input, where it increases the level of the input signal.

The operational amplifier is thus always operated at its saturation. If the input voltage falls below the threshold voltage, the trigger system flips to the negative saturation voltage; if the threshold level is exceeded, it flips to the positive saturation voltage. The threshold voltage and the hysteresis of the Schmitt trigger are determined by the ratio of the two resistors which are in the input circuit and in the feedback circuit.

Schmitt trigger for pulse regeneration

Schmitt trigger for pulse regeneration

The Schmitt trigger is named after the American scientist Otto Herbert Schmitt (1913 - 1998). Schmitt triggers are used, among other things, for pulse regeneration in regenerators and for the regeneration of switching signals which have overshoots from bouncing.

Informations:
Englisch: Schmitt trigger
Updated at: 07.09.2010
#Words: 181
Links: trigger, feedback, differential amplifier, operational amplifier (OpAmp), signal
Translations: DE
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