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门电路有一个阈值电压,当输入电压从低电平上升到阈值电压或从高电平下降到阈值电压时电路的状态将发生变化。施密特触发器是一种特殊的门电路,与普通的门电路不同,施密特触发器有两个阈值电压,分别称为正向阈值电压和负向阈值电压。在输入信号从低电平上升到高电平的过程中使电路状态发生变化的输入电压称为正向阈值电压(),在输入信号从高电平下降到低电平的过程中使电路状态发生变化的输入电压称为负向阈值电压()。正向阈值电压与负向阈值电压之差称为回差电压()。普通门电路的电压传输特性曲线是单调的,施密特触发器的电压传输特性曲线则是滞回的.
The schimmit trigger circuit is a logic inverter circuit or a non inverter circuit that has a defined threshold and hysteresis so that the output toggles high at one voltage and toggles low at another voltage.
It is used to create a defined output start from a relatively undefined input state. Commonly used at interface inputs between Analogue circuits and digital circuits.