当前位置：网站首页>(6) "Digital Electricity" - Diodes and CMOS Gate Circuits (Introduction)

Now we get to the study of the gate,Because there is no circuit principle and mode electric course,So it is difficult to understand,But also be in stumbling gain some knowledge,如有错误,Also hope you can timely put forward！

In the process of learning gate,We first need to know a thing,叫做PN结,This thing behind is the core of our knowledge in the process of,所以我们先来介绍一下PN"What is going on！

PN结

关于PN结,Is a key learning in mold electrical course,And I didn't study mode electric,Just find a popular science video on the Internet,Interpretation of the special clear,Depth of content also meets our requirements,After repair of electric module courses,I still want to use this video to explainPN结,Because who doesn't like animation type knowledge explain！

【硬件科普】带你认识CPU第00期——什么是MOSFET_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1nL411x7jH?spm_id_from=333.1007.top_right_bar_window_history.content.click&vd_source=4f47a44a067734f2384169d1002baba8

UPThe main interpretation especially clear,So we also don't do too much introduction,大家了解了PNAnd theMOSBasic knowledge of the pipe line！ This is just our foundation,Also our appetizers,接下来,We will start further our gate、二极管以及MOS管了！

门电路

定义

实现基本运算、Compound operation unit circuit,如与门、与非门、Or door and so on.

逻辑状态

Circuit with high and low electric presentation logic state１、０.

正逻辑

高电平为１,低电平为０.

负逻辑

高电平为０,低电平为１.

电平

Mainly pay attention to three points here
High and low level is an,而不是一个具体的值
开关断开,输出高电平,Hope is proposed.theoretical little.
开关闭合,输出低电平,Hope is proposed.theoretical big.
So there is contradiction,We are going to solve this contradiction behind.

二极管

开关特性

When we use diode as the switch circuit above,To the diode high level,相当于开关断开,To the diode low level,相当于开关闭合,So the performance for a state to follow,Is to give the diode high level,输出高电;To the diode low level,输出低电平.

与门

Through such a circuit connection,We can get an and gate.

或门

电阻接地,We get the or gate.

缺点

MOS管

结构

MOSThis part of knowledge in the video also explained the, This place and in the video is the same,I think the video is more vivid,哈哈哈！ English good students can kangkang introduction below.

类型

就是NChannel enhanced and P沟道增强型,The channel is a positive electric field,A reverse voltage form channel.Just look have hollow small circle.

NMOS

Low voltage without forming channel,相当于开关断开,Voltage within a certain range,是线性增长,Behind because of the PIP（Transverse electric field caused by）,Basic saturated.（Transmitted may be out of the question,Handwriting on the tablet is not the case）.

PMOS

与NMOS类似 .

CMOS

CMOSIn the video are also introduce,就是两个MOS合在一起,C就是（Complementary）.

工作原理

Actually is probably in the video,The introduction of specific can take a look at the following.

哈哈,You remember when we said before switching circuit of a contradiction？Is about the pull-up resistance,We can't good to find a suitable value,所以,We are now using a complementary logic to realize switching circuit,那就是CMOS.

最后,我们可以得到CMOSThe voltage characteristic of ,如图所示,我们在后面会详细介绍.

电压、电流传输特性

Voltage characteristic,We need to focus on the middle part of the,其实两个MOSTube have been conducting,And the middle part is halfVDD.
电流特性,Note that in low voltage or high voltage,Current actually very small,但是在中间部分,有电流,This is the cause of power consumption,Later we will analyze.

输入噪声容限

输入特征

输出特性

This place is difficult to understand,我们着重来讲解一下.
VDD增大,Equivalent to the channel（图片上写错了）内阻变小,压降减小,So the output voltage is small（低电平）.
负载（功率）变大,电流变大,The equivalent of equivalent resistance smaller,Internal resistance pressure drop larger,So the output voltage on the partial.
Also can use the ideas of the circuit to analysis（I draw circuit diagram）Load resistance smaller,电压变小,So the output is big.