《电子信息技术专业英语 教学课件 ppt 作者 丁宁 Unit 5Digital Logic Circuits》由会员分享，可在线阅读，更多相关《电子信息技术专业英语 教学课件 ppt 作者 丁宁 Unit 5Digital Logic Circuits（28页珍藏版）》请在金锄头文库上搜索。
1、Unit 5 Digital Logic Circuits,数字逻辑电路 (1),The main idea of this unit:,This unit is mainly discuss the basic knowledge about “digital logic circuits”. The two different states by which digital circuits operate : 0 and 1. (2) The three fundamental types of digital logic gates: the AND gate , the OR gat
2、e , and the NOT gate.,一.NEW WORDS,1.digital diitl adj.数字的 eg.(1) a digital computer (2) digital circuit (3) digital electronics digit (n.) 数字（0到9中任一数字） analogue (n.) 模拟 2.binary bainri adj.二进位的 eg.binary states 二进制状态,3.switch swi (n.)开关=device for turning on or off (v.)转换=exchange eg.the opening and
3、 closing of a switch the switching devices Phrase:switch over 完全改变 switch board 交换台 4.represent repri zent vt.代表 representation (n.) 表现，陈述 representative (adj.) 代表的 Phrase: be represented by 用表示,5.achieve i:v vt.完成, 达到 = complete ; acomplish. fail achievable (a.) 能做成的，能达到的 achievement (n.) 成就，成功，达到，
4、实现 eg. Ive achieved only half of what Id hoped to. He achieved success at last. Phrases: achieve success /ones ambition achieve peace of mind 得到心情的平静 (文中)： be achieved by + n. v.ing,6.pulse pls n.脉冲 ；脉搏 eg.The positive pulses can represent 1 and the negative pulses can represent 0. 7.positive pztiv
5、adj.正的；确定的 positively (ad.) 积极地 positivism (n.) 积极性 8.negative netiv adj.负的;v.否定 negatively (ad.) eg.He has a very negative attitude to his business. The manager shouldnt negative the resonable request.,9.inversion inv:n n.倒置， 反相 inverse (a.) 相反的 invert (vt.) 倒置，倒转 10.opposite pzit adj.相反的 (方向或方位上相反
6、) =contrary 表示性质或倾向上相反 same (文中)：An important function of NOT gate is to produce signal inversion or an output signal that is opposite in nature to the input signal.,二. Technical terms:,Digital electronics 数字电子技术 2. square-wave signal 方波信号 3. digital logic gate 数字逻辑门 4. AND gate 与门 5. OR gate 或门 6.
7、NOT gate 非门 7. flip-flop 触发器,三. Expressions:,consist of 由组成，表示一个整体由各部分组成。 = be made up of 与constitute比较: 表示各部分构成一个整体 in this case 在这种情况下；既然是这样 in the case of 就而言 in case of 假如；万一 in no case 绝不 in any case 总之；无论如何 either or 或者或者(两者之中选一),eg. Either you or he has to go there. neither nor 既不也不 not only
8、but also 不但而且 四. Questions for text discussion: The digital circuit usually operates on two different simple states, what are they? They can , in the most simple form consist of the opening and closing of a switch. What are the three basic types of digital logic gates?,The three basic types of digit
9、al logic gates are the AND gate, the OR gate ,and the NOT gate. What is the NOT gate function? The function of NOT gate is to produce signal inversion or an output signal that is opposite in nature to the input signal.,数字逻辑电路 (2),Unit 5 Digital Logic Circuits,Learn the text:,The first paragraph: The
10、 phrase “digital electronics ” is used to describe those circuit systems which primarily operate with the use of only two different voltage levels or two other binary states. The two different states by which digital circuits operate may be of several forms. They can , in the most simple form , cons
11、ist of the opening and closing of a switch. In this case, the closedswitch state can be represented by 1 and the open-switch state by 0. Phrases: digital electronics ; be used to; consist of ; in this case; be represented by;open/closed-switch,译：“数字电子”这一词常用来描述仅工作于两种不同电压或两种不同二进制状态的电路系统中。数字电路工作的两种不同状态
12、可能呈现几种形式，其中最简单的形式由开关的开和关组成，这种情况下，闭合的开关状态由1代表，断开的状态由0代表。 The second paragraph: A very common method of digital operation is achieved by using voltage pulses. The presence of a positive pulse can be represented by 1 and the absence of a pulse by 0. With a square-wave signal , the positive pulses can r
13、epresent 1 and the negative pulses can represent 0. Phrases: be achieved by ; voltage pulse; positive/negative pulse;,译：获得数字工作状态的常用方法是通过电压脉冲实现， 正脉冲的到来用1表示，脉冲的缺省用0表示。对于方 波信号正脉冲用1表示，负脉冲用0表示。 The third paragraph: Integrated circuits containing many transistors are most commonly used as switching device
14、s in digital electronics logic gates. The three basic types of digital logic gates are the AND gate, the OR gate, and the NOT gate. The operation of an AND gate is mathematically expressed by the equation AB=C. This can be read as “input A and input B equals output C”. The operation of an OR gate is
15、 often expressed by the equation A+B=C. This can be read as “either input A or input B(or both) equals output C”. An important function of NOT gate is to,produce signal inversion or an output signal that is opposite in nature to the input signal . Any logic function can be performed by the three bas
16、ic gates that have been described. Even in a large scale digital system , such as a computer, control , or digital-communication system, there are only a few basic operations, which must be performed. The three basic types of digital logic gates and the flip-flop are the four circuits most commonly employed in such systems. P
