Schmitt Trigger

In electronics, a Schmitt trigger is a circuit with positive feedback and a loop gain greater than 1. The circuit is named a "trigger" because the output retains its value until the input changes sufficiently to trigger a change. In the non-inverting configuration, when the input is higher than a certain chosen threshold, the output is high. When the input is below a different (lower) chosen threshold, the output is low, and when the input is between the two levels, the output retains its value. This dual threshold action is called hysteresis and implies that the Schmitt trigger possesses memory and can act as a bistable circuit (latch). There is a close relation between the two kinds of circuits: a Schmitt trigger can be converted into a latch and a latch can be converted into a Schmitt trigger.

Schmitt trigger devices are typically used in open-loop controller configurations for noise immunity, and closed loop negative feedback configurations to implement bistable regulators, triangle/square wave generators, etc.

Read more about Schmitt Trigger:  Invention, Applications

Other articles related to "schmitt trigger, trigger, schmitt":

Operational Amplifier Applications - Oscillators - Relaxation Oscillator
... add slow negative feedback to the inverting Schmitt trigger, a relaxation oscillator is formed ... through the RC network causes the Schmitt trigger output to oscillate in an endless symmetric square wave (i.e ... the Schmitt trigger in this configuration is an astable multivibrator) ...
Implementation - Op-amp Implementations - Non-inverting Schmitt Trigger
... For instance, if the Schmitt trigger is currently in the high state, the output will be at the positive power supply rail (+VS) ... So this circuit creates a switching band centered around zero, with trigger levels (it can be shifted to the left or the right by applying a bias ... A practical Schmitt trigger with precise thresholds is shown in the figure on the right ...
Power-on Reset - PoR Generator
... A Schmitt trigger may be used to deassert the reset signal cleanly, once the rising voltage of the RC network passes the threshold voltage of the Schmitt trigger ... calculated so that the time to reach the switching threshold of the schmitt trigger is enough to apply a long enough reset pulse ... So when the input schmitt stage is all powered up and ready, the input voltage from the RC network would already have crossed the schmitt trigger point ...
Schmitt Trigger - Applications - Use As An Oscillator
... A Schmitt trigger is a bistable multivibrator, and it can be used to implement another type of multivibrator, the relaxation oscillator ... a single RC integrating circuit between the output and the input of an inverting Schmitt trigger ... frequency depends on the values of R and C, and the threshold points of the Schmitt trigger ...
Operational Amplifier Applications - Comparators and Detectors - Schmitt Trigger
... In this configuration, the input voltage is applied through the resistor (which may be the source internal resistance) to the non-inverting input and the inverting input is grounded or referenced ... The hysteresis curve is non-inverting and the switching thresholds are where is the greatest output magnitude of the operational amplifier. ...