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电子信息类专业英语(第三版) 第5章

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《电子信息工程专业英语导论》课件PART_2_unit5

《电子信息工程专业英语导论》课件PART_2_unit5
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The exact structure of control bus varies among processors in the 80x86 family. However, some control lines are common to all processors and are worthy a brief mention. The read line and write line control the direction of data on the data bus.
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Circuitry associated with the memory or I/O recognizes this address and instructs the memory or I/O device to read the data from or place data on the data bus. 与存储器或输入输出相关的电路能够识别地址， [2]. 与存储器或输入输出相关的电路能够识别地址，
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If the write line is low, the system transfers data from the CPU to memory. The main memory is the central storage unit in a computer system. It is a relatively large and fast memory used to store programs and data during the computer operation. The principal technology used for the main memory is based on semiconductor integrated circuit.

电子课件英语第三版Unit 5

电子课件英语第三版Unit 5

Task 1: General English
New Words and Expressions
hobby /'h.bi/ n. 业余爱好 interest /'.ntr.st/ n. 兴趣 classic /'kl.s.k/ adj. 经典的 leisure /'le..(r)/ n. 空闲，闲暇 spare /spe.(r)/ adj. 多余的，剩下的 model /'m.dl/ n. 模型 airplane /'e.ple.n/ n. 飞机 pleasure /'ple..(r)/ n. 愉快，乐趣
Task 1: General English
Zhang Hua likes going fishing with her friends in her spare time. Last Sunday, she went fishing with her friends. Down at the river, she put some bait on the hook, and then threw the hook into the water. After three hours, she felt that there was something on the hook. She slowly and gently pulled the string out of the water. “It is an old shoe!” Her friends laughed. “Oh, I think we must go home now.” Zhang Hua said. How fun it was for Zhang Hua!
Hobbies

《电子信息专业英语》电子教案 Unit5

《电子信息专业英语》电子教案 Unit5
Here are some examples covering a couple of different multimeters
Example 1: This meter is very simple. When the probes are not touching, the display shows “1” When you touch the tips together, the display changes to a three digit mode(it’s displaying resistance, which we will cover later). It also emits a beep, as shown in Fig 14-3
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Lesson 14 The Use of Multimeter
Get into the right mode
There are often two seperate modes for AC and DC voltage. Both will have a V but one will have two lines, one dashed and one solid (DC) and one will have a wave next to it (AC), as shown in Fig 14-6
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Lesson 14 The Use of Multimeter
Get into the mode
First step is to get your multimeter into the correct mode. Look for the icon that looks sort of like a “sound wave ”. Here are two examples. Note that sometimes the mode is “dual” (or possibly more) usage, as shown in Fig 14-2

最新电子信息工程专业英语课文翻译(第3版)

最新电子信息工程专业英语课文翻译(第3版)

电子信息工程专业英语教程第三版译者：唐亦林p32In 1945 H. W. Bode presented a system for analyzing the stability of feedback systems by using graphical methods. Until this time, feedback analysis was done by multiplication and division, so calculation of transfer functions was a time consuming and laborious task. Remember, engineers did not have calculators or computers until the '70s. Bode presented a log technique that transformed the intensely mathematical process of calculating a feedback system's stability into graphical analysis that was simple and perceptive. Feedback system design was still complicated, but it no longer was an art dominated by a few electrical engineers kept in a small dark room. Any electrical engineer could use Bode's methods find the stability of a feedback circuit, so the application of feedback to machines began to grow. There really wasn't much call for electronic feedback design until computers and transducers become of age.1945年HW伯德提出了一套系统方法，用图形化方法来分析反馈系统的稳定性。

电子信息工程专业英语教程__ Lesson 5 Low-pass Filters

电子信息工程专业英语教程__ Lesson 5 Low-pass Filters
• A language object that may take different values, one at a time. Note: The values of a variable are usually restricted to a certain data type.
• In programming, a character or group of characters that refers to a value and, in the execution of a computer program, corresponds to an address.
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《电子信息工程专业英语教程》
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Vocabulary
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《电子信息工程专业英语教程》
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Variable in dictionary
• A quantity that can assume any of a given set of values.
• Any factor or condition which can be measured, altered, or controlled (e.g. , temperature, pressure, flow, liquid level, humidity, weight, chemical composition, color, etc.).
Figure2.4a. The complex function of a second-order low-pass filter (Q = 0.707)
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《电子信息工程专业英语教程》
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Second-Order Low-Pass Filters

电子信息专业英语第5章

电子信息专业英语第5章
Digital Logic Circuit
Notes to the text
1. The various families of digital logic devices, usually integrated circuits, perform a variety of logic functions through logic gates, including“OR”，“AND”，and“NOT”，and combinations of these (such as“NOR”，which includes both OR and NOT). 不同系列的数字逻辑器件(通常是集成电路)通过逻辑门 电路来执行各种不同的逻辑功能，这些门电路包括或门、 与门和非门，以及它们的各种组合(例如或非门是由或门和 非门组成的)。句中，“usually integrated circuits”为插入语； “including “OR”，“AND”，and“NOT”，and…”为现在分
Unit 5 Digital Logic Circuit
perform a variety of logic functions through logic gates,
including“OR”, “AND”, and“NOT”, and combinations of these (such as“NOR”, which includes both OR and NOT). One widely used logic family is the transistor-transistor logic (TTL). Another family is the complementary metal oxide semiconductor logic (CMOS), which performs similar functions at very low power levels but at slightly lower operating speeds.

【精品】电子信息工程专业英语课后答案

电子信息工程专业英语课后答案电子信息工程专业英语-教师用书Part 1第一课关于电子技术一、课文习题参考答案Ⅰ. （1） alternating current circuits （2） semiconductor diodes（3） passive component（4） the combinatory logic electric circuit（5） rectification（6） Laplace transform（7） inductor（8） Fourier series and Fourier transformⅡ.（1）控制理论（2）场效应管三极管（3）布尔代数（4）稳压（5）相关性和功率谱密度（6）滤波器类型（7）模/数转换器（8）时序逻辑电路的分析与综合Ⅲ.(1)Electronics is a part of the larger field of electricity. The basic principles of electricity are also common to electronics. Modern advances in the field of computer, control system, communications have a close relationship with electronics. The field of electronics includes the electron tube, transistor, integrated circuit and so on.(2) Direct current circuits & Alternating current circuits,Analog electronics,Digital electronics,signal and systems,Circuit theory and design, Control theory, Microcontrollersystems,Computer programming for engineering applications.(3) This curriculum mainly introduces the characteristics of semiconductor devices in linear application scope.The content involved in semiconductor diodes (PN junction diodes, special purpose diodes), transistors (field effects and bipolar transistors), signal amplifiers, practical amplifiers, biasing circuits, operationalamplifiers circuit and other circuits (rectification, regulation and DC power supplies).(4) This partial studies take the basicelectric circuit theory and the operational amplifier knowledge as the foundation. The main study goal is to enhance understanding of the electric circuit theory. Its main content includes the elementary theory in circuit theory (network functions, characteristic frequencies), types offilter (lowpass,bandpass), review of operational amplifiers (design of first and second order using operational amplifiers, cascade design), filter characteristics(Butterworth, Chebyshev, frequency transformations in design, sensitivity design of passive LC ladder filters and a brief introduction to switched capacitor filters).(5) Perfect.二、参考译文电子学的发展电子学是电学的一部分。

电子信息工程专业英语 课文翻译 Unit 05 译文

Unit 5 多址技术Unit 5-1第一部分：多址技术：频分多址、时分多址、码分多址多址方案用于使许多用户同时使用同一个固定带宽的无线电频谱。

在任何无线电系统中分配的带宽总是有限的。

移动电话系统的典型总带宽是50MHz ，它被分成两半用以提供系统的前向和反向连接。

任何无线网络为了提高用户容量都需要共享频谱。

频分多址（FDMA ）、时分多址（TDMA ）、码分多址（CDMA ）是无线系统中由众多用户共享可用带宽的三种主要方法。

这些方法又有许多扩展和混合技术，例如正交频分复用（OFDM ），以及混合时分和频分多址系统。

不过要了解任何扩展技术首先要求对三种主要方法的理解。

频分多址在FDMA 中，可用带宽被分为许多个较窄的频带。

每一用户被分配一个独特的频带用于发送和接收。

在一次通话中其他用户不能使用同一频带。

每个用户分配到一个由基站到移动电话的前向信道以及一个返回基站的反向信道，每个信道都是一个单向连接。

在每个信道中传输信号是连续的，以便进行模拟通信。

FDMA 信道的带宽一般较小（30kHz ），每个信道只支持一个用户。

FDMA 作为大多数多信道系统的一部分用于初步分割分配到的宽频带。

将可用带宽分配给几个信道的情况见图5.1和图5.2。

时分多址TDMA 将可用频谱分成多个时隙，通过分配给每一个用户一个时隙以便在其中发送或接收。

图5.3显示如何以一种循环复用的方式把时隙分配给用户，每个用户每帧分得一个时隙。

TDMA 以缓冲和爆发方式发送数据。

因此每个信道的发射是不连续的。

待发送的输入数据在前一帧期间被缓存，在分配给该信道的时隙中以较高速率爆发式发送出去。

TDMA 不能直接传送模拟信号因为它需要使用缓冲，因而只能用于传输数字形式的数据。

由于通常发送速率很高，TDMA 会受到多径效应的影响。

这导致多径信号引起码间干扰。

TDMA 一般与FDMA 结合使用，将可用的全部带宽划分为若干信道。

这是为了减少每个信道上的用户数以便使用较低的数据速率。

通信与电子信息科技英语课件unit5

Modulation
11 digitize
vt. ……
12 proportional
adj.
proportional to与……成比例，成正比
13 disperse
v.
14 vestigial
adj. 残留的,
vestigial sideband残留边带
15 integral
n.
adj.
16 collectively
16 ASK(amplitude shift keying)
17 FSK(frequency shift keying)
18 PSK(phase shift keying)
19 DPSK(Differential PSK)
20 suit to
Modulae
Coded or Digital Modulation Method Coded modulation involves changing a characteristic of a pulse train but is
Modulation
a markedly different method from pulse modulation. The method involves first sampling the information signal, quantizing the sample by rounding off to the closest of a number of discrete levels, and finally generating a prescribed number of pulses according to a code related to the nearest discrete level. In the simplest system the code may determine the presence or absence of pulses in the prescribed number, or, alternatively, it may determine pulse sign. Both cases correspond to pulses having only two possible levels. More complicated systems are also feasible with pulses having a larger number of discrete levels.

《电子信息专业英语》电子教案 第5单元

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第14课 万用表的使用
例1：第一个测试电池是一个新的1.5V的碱性电池。不论它是
AAA,AA,还是C或者D级别都有相同的电压。把量程调到2 V直 流电压挡上。 如图14-7所示，我们可以读出：1.588 V，这个电压你可能认 为有错误，因为毕竟它是1.5 V电池，难道测出来的电压不该为 1.5 V吗？其实不然，写在电池上面的1.5 V只是额定电压，或 者所期望从电池得到的平均电压。事实上，碱性电池刚开始电压 稍高，然后慢慢拖降到1.3 V，最后到1.0 V或者更低。
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第14课 万用表的使用
例2：测量一个9 V的碱性电池，如果依然设置2 V DC的量程， 会在显示屏上显示“1”，它表示超出量程,如图14-8所示。
将表的量程固定在20 V DC，再试一次。对于这个新电池，它 的 电 压 为 9.6V 。 记 住 电 池 上 表 示 的 电 压 是 象 征 性 的 ， 标 示 的 “9 V”只是电池的平均电压。事实上，它刚开始电压高达9.5 V，然后掉到9 V，然后慢慢地降到7 V。
这是一块双模式的万用表，但是仍然很容易使用。把表面转到该 标示。当两探针没有接触时，显示屏显示代表开环的“OL”； 而当两探针接触时，对应的声波图标显示在显示器的右上方，同 时还显示一个具体的数字，这个数字不是阻抗，而是电压,如图 14-4所示。
测量PCB
例：这是一个关于PCB板的导通性的测试例子。第一幅图表示 PCB板上没有连通，而第二幅图表示两点导通,如图14-5所示。
第五单元
第14课 万用表的使用 第15课 示波器 第16课 信号发生器
第14课 万用表的使用
怎么检测键盘中的“w”和“e”是否串键？如图14-1所示。 仔细思考发现，检测键盘串键问题等效为用万用表测量PCB
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The transistor current and voltage variations have no effect
on the supply voltage (VCC).So, when assessing the AC performance of the circuit; VCC can be treated as a short circuit. The coupling capacitor C1 also becomes a short circuit to AC signals.gure 3.1 with VCC and C1 shorted gives the AC equivalent circuit shown in Figure 5.2.
The voltage drop across RL is IC·RL=1 mA×10 kΩ=10 V, and the collector to emitter voltage VCE is VCC-(IC·RL) =20 V-10 V=10 V.
The circuit DC conditions have been established as IB=20 μA, IC=1 mA, VCE=10 V, VCC=20 V. If VBE is increased until IB=25μA, then
IC≈βIB=50×25×10-6=1.25 mA The voltage drop across RL is IC·RL=1.25 mA×10 kΩ=12.5 V, and VCE= VCC-(IC·RL) =20 V-12.5 V=7.5 V.
When IB is 20 μA, VCE=10 V, and when IB is 25 μA, VCE=7.5 V.
The variation in base emitter voltage could be produced by the AC signal VS. This might require signal amplitude of perhaps ±10 mV. If VS=±10 mV produces VO=±2.5 V, the signal may be said to be amplified by a factor of VO/VS=2.5 V/10 mV=250, or circuit amplification is 250.
Unit ５ Electrical Technique
Passage A Analog Circuit Passage B Binary System and Logic Systems Passage C Magnitude Locked Loop
Passage A Analog Circuit
Hence, for an increase in IB of 5 μA, VCE decreased by 2.5V (i.e., VCE changed by the same amount as the voltage change across RL).
Similarly, if VBE is decreased until IB is 15 μA, IC becomes 50×15×10-6=0.75 mA and IC·RL=0.75 mA×10 kΩ=7.5 V. Thus, VCE=20 V-7.5 V=12.5 V.Therefore, for a 5 μA decrease in IB, VCE increases by 2.5 V.
Assume that RB is selected to give a base current of IB=20 μA. Also, let the DC current gain factor of the transistor be
β=50. Then IC≈βIB=50×20×10-6=1mA
Figure 5.1 Common Emitter Circuit
A signal voltage VS having a source resistance RS is capacitor coupled via C1 to the transistor base. The output is derived via another capacitor C2 connected to the transistor collector. Both capacitors are open circuit to direct currents, but offer very low impedance to AC signals. If the signal source were direct connected instead of capacitor coupled, there would be a low resistance path from the base to the negative supply line, and this would affect the circuit bias conditions. Similarly, an external load directly connected to the transistor collector might alter the collector voltage.
1. Principles of Common Emitter Circuit An NPN transistor is shown in Figure 3.1 with a load resistor (RL=10 kΩ) in series with the collector terminal. A collector supply voltage (VCC=20 V) is provided with a polarity that reverse biases the collector base junction. A base current IB is also provided via RB, and this is results in a forward bias (VBE) at the base emitter junction.