Operational Amplifier Applications - Comparators and Detectors - Schmitt Trigger

Schmitt Trigger

A bistable multivibrator implemented as a comparator with hysteresis.

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.

Alternatively, the input source and the ground may be swapped. Now the input voltage is applied directly to the inverting input and the non-inverting input is grounded or referenced. The hysteresis curve is inverting and the switching thresholds are . Such a configuration is used in the relaxation oscillator shown above.

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

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 voltage to the inverting input) ... A practical Schmitt trigger with precise thresholds is shown in the figure on the right ...
Operational Amplifier Applications - Oscillators - Relaxation Oscillator
... By using an RC network to add slow negative feedback to the inverting Schmitt trigger, a relaxation oscillator is formed ... The feedback 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) ...
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 ... of R and C, and the threshold points of the Schmitt trigger ...
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 ... the R and C values can be 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 ...