阈值电压

施密特触发器 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。 1.正向阈值电压：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 2.负向阈值电压：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 3.当输入电压高于正向阈值电压，输出为低；当输入电压低于负向阈值电压，输出为高；当输入在正负向阈值电压之间，输出不改变。 来源： CSDN 作者： 一只默默努力的小透明 链接： https://blog.csdn.net/qq_44431690/article/details/104107549

http://hi.baidu.com/hieda/blog/item/c996d9cc5d1a8c1400e92877.html 施密特触发器( Schmitt Trigger )，简单的说就是 具有滞后特性的数字传输门 。 （一）施密特触发器结构举例 （二）施密特触发器具体分析 （三）施密特触发器电路用途 （四）施密特触发器 相关部分总结 （五）附：用555定时器构成施密特触发器 用555定时器构成多谐振荡器 Sometimes an input signal to a digital circuit doesn't directly fit the description of a digital signal. For various reasons it may have slow rise and/or fall times, or may have acquired some noise that could be sensed by further circuitry. It may even be an analog signal whose frequency we want to measure. All of these conditions, and many others, require a specialized circuit that will