For this purpose, it subtracts a part of its output voltage from the threshold (it is equal to adding voltage to the input voltage). In the third technique, the threshold and memory properties are separated.Дynamic threshold (series feedback): when the input voltage crosses the threshold in some direction the very circuit changes its own threshold to the opposite direction. In these configurations, the output voltage increases the effective difference input voltage of the comparator by decreasing the threshold or by increasing the circuit input voltage the threshold and memory properties are incorporated in one element. The first two of them are dual versions (series and parallel) of the general positive feedback system. There are three specific techniques for implementing this general idea. The positive feedback is introduced by adding a part of the output voltage to the input voltage so, these circuits contain an attenuator (the B box in the figure on the right) and a summer (the circle with '+' inside) in addition to an amplifier acting as a comparator. Schmitt trigger is a system with an avalanche-like positive feedback (B 1), in which the output helps the inputД¬ircuits with hysteresis are based on the fundamental positive feedback idea: any active circuit can be made to behave as a Schmitt trigger by applying a positive feedback so that the loop gain is more than one. Schmitt trigger devices are typically used in open loop configurations for noise immunity and closed loop negative feedback configurations to implement bistable regulators, triangle/square wave generators, etc.

There is a close relation between the two kinds of circuits that actually are the same: a Schmitt trigger can be converted into a latch and v.v., a latch can be converted into a Schmitt trigger. This dual threshold action is called hysteresis and implies that the Schmitt trigger possess memory and can act as a bistable circuit ( latch). The circuit is named '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 when the input is between the two, the output retains its value. In electronics, Schmitt trigger is a generic name of threshold circuits with positive feedback having a loop gain > 1. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

Matlab 2009 л°”нѓ•н™”л©ґ л°”кѕёкё°