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Transfer function of a Schmitt trigger. The horizontal and vertical axes are input voltage and output voltage, respectively. T and −T are the switching thresholds, and M and −M are the output voltage levels.
In electronics, a Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier. It is an active circuit which converts an analog input signal to a digital output signal. 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 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 multivibrator (latch or flip-flop). 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 signal conditioning applications to remove noise from signals used in digital circuits, particularly mechanical contact bounce in switches. They are also used in closed loop negative feedback configurations to implement relaxation oscillators, used in function generators and switching power supplies.
Comparison of the action of an ordinary comparator (A) and a Schmitt trigger (B) on a noisy analog input signal (U). The green dotted lines are the circuit's switching thresholds. The Schmitt trigger tends to remove noise from the signal.
In signal theory, a schmitt trigger is essentially a one-bit quantizer.
In electronics, a Schmitttrigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator...
to the inverting Schmitttrigger, a relaxation oscillator is formed. The feedback through the RC network causes the Schmitttrigger output to oscillate...
field of biomedical engineering. Schmitt also coined the term biomimetics and invented or co-invented the Schmitttrigger, the differential amplifier, and...
(electronics), called a trigger circuit by IBM Image trigger, a device used in high speed cameras Schmitttrigger, an electronic circuit Trigger (Only Fools and...
versa. The earlier inverting Schmitttrigger animated example operates on the same principle (since the Schmitttrigger internally performs comparison)...
squid giant axon inspired Otto Schmitt to develop a comparator circuit with hysteresis now called the Schmitttrigger, replicating the axon's propagation...
but sharp thresholds are required for later digital processing, the Schmitttrigger circuit uses positive feedback to ensure that if the input voltage...
Manufacturing Company Schmitt Brothers, barbershop quartet Schmitt Gillenwater Kelly syndrome, an autosomal dominant syndrome Schmitttrigger, a type of comparator...
A Triggering device is an electronic circuit, such as a Schmitttrigger, which is used to control another electronic circuit. In many of industrial operations...
It is also used in relaxation oscillators, multivibrators, and the Schmitttrigger. Optical bistability is an attribute of certain optical devices where...
These devices contain a fast acting electronic switch (generally a Schmitttrigger) forming a gated astable oscillator which detects and locks (latches)...
non-inverting Schmitttrigger followed by an inverting integrator that feeds back its output to the Schmitttrigger's input. The output of the Schmitttrigger is...
incorporated in many artificial systems: for example, in thermostats and Schmitttriggers, it prevents unwanted frequent switching. Hysteresis can be a dynamic...
electronic block (Grundbaustein), which contained an operational amplifier, Schmitttrigger and delay line circuits could be built. In the late 1970s, electronic...
the input signal, increasing the amplification. One example is the Schmitttrigger (which is also known as a regenerative comparator), but the most common...
feedback is a Schmitttrigger configuration. Alone, the trigger is a bistable multivibrator. However, the slow negative feedback added to the trigger by the...
more rarely, an inductor) and a nonlinear switching device (a latch, Schmitttrigger, or negative-resistance element) connected in a feedback loop. The...
just below the temperature where the air-conditioning system starts. Schmitttrigger "Dead Band Plus Hysteresis Estimation with ValveLink Diagnostics" (PDF)...
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