Chapter1 Introductory Concepts

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1 Chapter1 Introductory Concepts
电力电子技术： 应用于电力领域，主要用于电力变换。 电子技术 模拟电子技术： 应用于模拟电路 信息电子技术： 主要用于信息处理。 数字电子技术： 应用于数字电路（举例） 该双语课程特点： 1.54（理论）+20（实验）学时 2.专业基础(考研备考）课 3.双语特色（授课特点与学习方法） 课程主要内容与目标：1.数字电路的分析 2.~设计

2 Contents Digital and Analog Quantities
Binary Digits, Logic Levels and Digital Waveforms Basic Logic Operations (be discussed together with chapter 3)

3 1-1 Digital and Analog Quantities （数字量和模拟量）
Electronic circuits can be divided into two broad categories, digital and analog. We are discussing both digital electronics(数字电子学）and analog electronics （模拟电子学）in this term.

4 1-1-1 Analog Quantities An analog quantity (模拟量)is one having continuous (连续的) values. 强调：在时间和幅值上都连续取值的信号。（举例：空调）

5 1-1-1 Analog Quantities Many quantities are analog in nature; that is, they are continuous quantities. Physical quantities such as temperature (温度), pressure (压力), time (时间), distance(距离), and sound (声音) are examples of analog quantities.

6 1-1-2 Analog Systems Analog systems: For example:滤波器、信号发生器等。
处理模拟信号的电子电路。 Amplifier For example:滤波器、信号发生器等。

7 1-1-3 Digital Quantities A digital quantity (数字量) is one having a discrete (离散的 )(discontinuous) set of values. 强调：数字信号是在时间和幅值上都离散的信号。

8 1-1-4 Digital Systems Digital systems: 处理数字信号的电子电路。

9 1-1-4 Digital Systems Now most of modern electronic devices and systems are digital system.

10 1-1-5 The Digital Advantage
Can be processed and transmitted more efficiently and reliably . Easy to be stored, and can be stored more compactly and so on. Can’t be affected by noise.

11 1-2 Binary Digits, Logic Levels, and Digital waveforms
1-2-1Binary Digital Logic (二值数字逻辑） 重点 2 opposite states.（没有第3种） switch: open and close. lamp: turn on and turn off. 数字0——逻辑0 数字1——逻辑1 有且只有两种对立的逻辑状态，这样的逻辑关系称为“二值数字逻辑”或简称“数字逻辑”。

12 1-2-2 Binary Digits The two-state number system is called binary(二进制）, and its two digits are 0 and 1. Positive logic (common) (正逻辑）: HIGH=1 and LOW=0. Negative logic (负逻辑） (less common): HIGH=0 and LOW=1 Logic 0 Logic 1 False True Off On Low High No Yes Open switch Close switch

13 1-2-3 Logic Levels（逻辑电平） The voltages used to represent a 1 and a 0 are called logic levels.（即表示逻辑1和逻辑0的高低电平） High Level（高电平） Low Level（低电平） 2 different voltage levels: HIGH and LOW.

14 1-2-4 Digital Waveforms （后面讲）
The pulse: rising (leading) edge (上升沿）and falling (trailing) edge (下降沿）. Pulse width : (脉宽） the duration of the pulse. Period T (周期） : the fixed interval repeated by the periodic pulse . Frequency f: the reciprocal （倒数）of the period.

15 1-2-5 The Difference Between Digital Circuits and Analog Circuits
输入、输出和处理的信号不同 输入变量和输出变量之间表达的关系不同 模拟电路：数值关系 数字电路：逻辑关系（因果关系） 故，数字电路也叫数字逻辑电路。