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什么是“门”电路(电子硬件)
2022-08-11 00:03:00 【奥利给技术饭】
“门”电路是什么?是门里的电路吗?
并不是哦,门电路是一种逻辑关系电路,用来实现基本的逻辑运算和符合逻辑元素的单元电路。所以像平时听见的与门,或门,非门,与非门,异或门都是门电路。
(图:与门)
所以门电路在作用时,必要要有输入信号,只有满足门电路的某个逻辑关系时,才会有信号输出。并且输入端可以有一个或多个,但是输出端只有一个。
在逻辑关系上,它只有有和无的状态,用“1”和“0”来表示,也称为高电平和低电平。
之所以叫“门”电路,关键点在于这个门,因为门通常关联的意思有打开门和关闭门,所以当某个逻辑关系电路有信号输出时,门相当于打开,没有信号输出时,门相当于关闭,叫“门电路”可以很形象的概括其特点。
基本逻辑关系:与逻辑,或逻辑,非逻辑(与门,或门,非门)。
也就是与,或,非,包括所有复杂的逻辑关系也都是由三个基本逻辑关系组成,只不过组成成分,方式更加多样。
各类门电路
各类门电路图片
”异或门“和”同或门“
异或门:若两个输入的电平相异(不一样),则输出为高电平1
同或门:若两个输入的电平相同,则输出为高电平1(与异或门刚好相反)
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