For faster navigation, this Iframe is preloading the Wikiwand page for 与门.

与门

基本逻辑闸
缓冲
与非
或非
异或 同或
蕴含 蕴含非
输入 输出
A B A AND B
0 0 0
0 1 0
1 0 0
1 1 1

与门(英语:AND gate)是数字逻辑中实现逻辑与逻辑门,功能见右侧真值表。仅当输入均为高电压(1)时,输出才为高电压(1);若输入中至多有一个高电压时,则输出为低电压。换句话说,与门的功能是得到两个二进制数的最小值,而或门的功能是得到两个二进制数的最大值。

概述

下列包括逻辑门的3种符号:形状特征型符号(ANSI/IEEE Std 91-1984)、IEC矩形国标(中国大陆)符号(IEC 60617-12)和不再使用的DIN符号(DIN 40700)。其他的逻辑门符号见逻辑门符号表

表达式 符号 功能表 继电器逻辑
ANSI/IEEE Std 91-1984 IEC 60617-12 DIN 40700




A B Y = AB
0 0 0
0 1 0
1 0 0
1 1 1

若与门的其中一个输入取反则成为禁门(INHIBIT logic gate,INHIBITOR)。

实现

与门是基本的逻辑门,因此大多数半导体制造商都会生产这种集成电路。例如,在TTL集成电路7408和CMOS集成电路4081均由四个2输入与门构成。

CMOS与门
NMOS与门

与门通常用n沟道(NMOS)或p沟道(PMOS)的MOSFET实现。数字输入ab引起输出F,这和与门的功能一致。

备选方案

与非门构成的与门

如果没有现成的与门,则可用与非门{x and y=(x nand y)nand (x nand y)}或或非门{(x and y=(x nor x)nor(y nor y)}来实现,因为与非门和或非门被认为是“通用的逻辑门电路”[1],因为通过这两种门电路可以实现其他所有门电路的功能。若用与非门实现与门,则将一个与非门的两个输入结在一起,然后在其输入端接入一个双输入的与非门;若用或非门实现与门,则将两个输入接在一起的或非门分别作另外一个或非门的两个输入,然后在后者的输入接一个输入接在一起的或非门。异或门也可用来实现与门,但很少使用。

参见

参考文献

  1. ^ Mano, M. Morris and Charles R. Kime. Logic and Computer Design Fundamentals, Third Edition. Prentice Hall, 2004. p. 73.

外部链接

{{bottomLinkPreText}} {{bottomLinkText}}
与门
Listen to this article

This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:

This article was just edited, click to reload
This article has been deleted on Wikipedia (Why?)

Back to homepage

Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}

Install Wikiwand

Install on Chrome Install on Firefox
Don't forget to rate us

Tell your friends about Wikiwand!

Gmail Facebook Twitter Link

Enjoying Wikiwand?

Tell your friends and spread the love:
Share on Gmail Share on Facebook Share on Twitter Share on Buffer

Our magic isn't perfect

You can help our automatic cover photo selection by reporting an unsuitable photo.

This photo is visually disturbing This photo is not a good choice

Thank you for helping!


Your input will affect cover photo selection, along with input from other users.

X

Get ready for Wikiwand 2.0 🎉! the new version arrives on September 1st! Don't want to wait?