基于可编程控制器施密特触发器的设计与分析

Design and analysis based on programmable controller and Schmitt trigger

数字系统中,常常需要施密特触发器,特别是回差电压很大,并且可以根据需要随意调节的施密特触发器。采用可编程控制器状态转移图和功能指令中的比较指令这一特殊方法设计了此款施密特触发器,通过调整可编程控制器构成的施密特触发器的上限门坎电平和下限门坎电平,巧妙地完成了回差电压很大、回差电压可随意调节这一功能。该设计具有设计简单,完成方便,不需要对电路重新组装的特点。

In digital systems,often need a Schmidt trigger,especially a large dropout voltage,and can be freely adjusted according to the requirements of Schmidt trigger.A Schmidt trigger is designed by using the programmable controller state transition diagram and a comparing instruction in the function instruction of this special method.Through the adjustment of a programmable controller of the Schmidt trigger upper threshold level and lower threshold level,the functions can be completed,such as dropout voltage is large and can be freely adjusted.The design has characteristics as simple in design,easy to complete,and do not need to reassemble circuit.