Unit 17 Electronic correspondence 电子信函 E-mail Fax Telex:电传

1.1 什么是电力电子技术 1.2 电力电子技术的发展史 1.3 电力电子技术的应用 1.4 主要内容

Unit 1 About Computer Text 1 Can You recognize Them? or Modern computers are electronic and digital devices. Figure 1-1 shows the basic organization of a personal computer, Figure 1-2 shows a notebook computer

Chapter 1 Introduction Instructor: Dr. Tianshuang Qiu School of the Electronic and Information Engineering Fall of 2004

Chapter 4 Transmission Media Instructor: Dr. Tianshuang Qiu School of the Electronic and Information Engineering Fall of 2004

Chapter 6 The Data Communications Interface Instructor: Dr. Tianshuang Qiu School of the Electronic and Information Engineering Fall of 2004

Noise is additional\unwanted \signal that interferes with the transmitted signal Generated by electronic devices The noise is a random process Each\sample \ of n(tis a random variable Typically, the noise process is modeled as\Additive White Gaussian noise”(AWGN) White: Flat frequency spectrur Gaussian noise distribution

Top Coatings Improve Ink Anchorage Excellent abrasion resistance Matte or gloss Developed for Specific Applications Press Printing Electronic Imaging Corona Treatment of facestock

一、填空(本题25分) 1.把电压信号转换为电流输出的电路称 放大电路,A=1o/ 称 利用 放大电路可将电流信号转换为电压信号, 其增益表达式为 2.晶体三极管的输出特性曲线一般分为三个区,即: ,要使三极管工作在放大区必须给发射 结加_ 、集电结加

一、填空(本题25分) 1.对共射、共集和共基三种组态放大电路,若希望电压放大倍数大,可选 用 组态;若希望带负载能力强,应选用 组态;若希望高頻 性能好,应选用 组态。 2.晶体三极管的输出特性曲线一般分为三个区,即: 要使三极管工作在放大区必须给发射 结加 、集电结加