The research of the thesis is framework design of the switch , the whole plan of hardware and software design , the schematic circuit design , and pcb layout , electromagnetic compatible design , signal integrality design and hot design of 10 / 100m module 本论文主要研究该交换机的架构设计，硬件整体设计方案，软件整体设计方案，电路原理图的设计，百兆交换模块的pcb布版设计、电磁兼容设计、信号完整性设计和热设计。
In this paper , a simple and practical circuit for laser diode modulation is presented , the principle circuit and the principle of choosing component are given , at last , application in sine wave modulation in non - cooperative target phase shift laser rangefinder is introduced 本文介绍了一种简单有效的半导体激光器调制电路，给出了电路原理图，元件的选择原则，最后介绍了在非合作目标相位式激光测距系统中实现正弦调制的应用。
This paper also offers the implementation method of software and hardware in detail , including the memory organization of tms320c5402 and the design of interface ; rtl8019 system structure , basic operation of reading and writing ; principle , function of other parts of hardware ' s circuit and whole principle picture ; tcp / ip protocol suitable for embedded system , software procedure of this system , implementation method of protocol , etc . this result indicates the scheme that combines chip dsp with interface chip of network can realize embedded systematic network accessing 详细地给出了这种解决方案的软硬件实现方法，包括tms320c5402的存储器组织和接口设计； rtl8019体系结构和基本读写操作；硬件电路其它部分的原理、功能及整体电路原理图；适合嵌入式系统特点的tcp ip协议、系统软件流程以及协议软件实现方法等等。本文结果表明采用dsp芯片与网络接口芯片相结合的方案能够实现嵌入式系统网络接入。
Secondly , basing on single channel if sr receiver mathematic model , this thesis has designed if sr receiver subsystem and brought forward its design project and system circuit principle diagram , and explained the system working principle . furthermore , this thesis introduces the working principles and respective applications of wideband high - speed adc ad6640 , ddc ad6620 and high - speed dsp tms320c6713 according with the if sr receiver subsystem high - speed analog digital conversion department , digital down conversion department and high speed digital signal processing department . thirdly , the thesis emphatically demonstrates the software realization department of the if sr receiver subsystem , which including ad6620 ' s inner parameter software setup , tms320c6713 data transmission and processing and the quadrant demodulation algorithm program realization 其次，基于单通道中频软件无线电接收机数学模型，本文设计了中频( if ， intermediatefrequency )软件无线电接收机子系统，给出了中频软件无线电接收机子系统的设计方案和系统电路原理图，说明了系统工作原理，并分别对应系统中的高速模数转换部分、数字下变频部分、基带数字硕士学位论文软件无线电理论研究及中频软件无线电接收机子系统设计信号处理部分，介绍了高速adcad664o ，数字下变频器( ddc ， digitaldownconverter ) ad6620 ，高速数字信号处理器( dsp ， digitalsignalproeessor ) tms320c6713的工作原理，以及它们在中频软件无线电接收机子系统中的应用。
Digital signal processor ( dsp ) combined with repm bldcm , which build up a dc adjustable speed system , achieve to control multiple motor speed , positive and negative rotate , protect and fault exemine by a true single chip . design and present a electromagnetism scheme of repm bldcm used in electromotion chair drive system . select electronical components and chips in the drive board by contrast with variant drive mode . design the drive board principle picture , make a drive board pcb and debug it . design a principle picture with dsp core . workout the motor control code introduced popular programme modle . test the programme reliability and control performance by linking tms320lf2407 evm , pc , drive borad and the bldcm . the bldcm swatch is prepare experiment 本论文阐述了方波驱动稀土永磁无刷直流电动机的原理及数学模型；设计并给出了一种电动座椅用稀土永磁无刷直流电动机的电磁设计方案；对电机采用何种驱动方式进行了对比分析；对驱动电路进行了元器件选型、原理图设计、制板及调试；有针对性的阐述了dsp在本系统应用中所涉及到的功能模块；设计了以dsp为核心的控制电路原理图；以模块化的软件编程思想编制了电机控制软件；通过tms320lf2407目标板、上位机、驱动板及电机的联调，证明了系统可行。
The computer control system of a high - speed industrial sewing machine is studied in the dissertation . the system ' s operation principle , the design nation with the core of 80c196kc mcu ( micro - chip computer ) also are discussed in the dissertation the methods of a minimum operation system of mcu , the principle circuit of signal adjusting , data collecting , keyboard controlling , led displaying , electromagnetic clutch and magnet valve power driver circuit etc . are proposed and realized 论文分析了工业高速自动剪线缝纫机(简称工缝机)计算机控制系统的工作原理，提出了以80c196kc单片机为控制核心的系统设计方案，并详述了关键部分的功能与实现方法。设计了电路原理图，完成了系统软硬件设计、安装，调试，和对系统原理样机的性能测试。
This paper introduces the research and development of a modulation and demodulation module of power line carrier , which is used in the area of power line communication . after analyzing the principium of system ' s function , comparing several projects and choosing the chips ( especially digital signal processor and programmable logic device ) , the software program based on the method of filter is designed with the developing environment of chips . then the circuit diagram is finished by the mean of eda software and the printing circuit board is designed 经过对系统功能原理的分析、几种方案的比较、硬件芯片(尤其是数字信号处理器与可编程逻辑器件)的选择，利用各种芯片的软件开发环境，编写出基于滤波法调制解调的系统软件程序，使用eda软件完成电路原理图并设计出印制板图后，经安装调试，成功地开发出电力线载波机调制解调模块。
The article tells of design and realization of pstn intelligent supervision and meterage system emphatically and brings forward general design of pstn intelligent supervision and meterage system in the first chapter including work principle of system , structure . choosing type of flowmeter , rs - 232 , rs - 485 transmission standard and i2c bus technique are introduced simply in the second and third chapter . the fourth chapter introduces data transmission in telephone network , puts important on adsl , the fifth chapter discusses the pstn material realization of system including choice of chip , design of circuit principle chart and sofeware 本文着重讲述了pstn智能监测系统的设计与实现，其中第一章提出了pstn智能监测系统的总体设计，包括系统的工作原理、组成结构；第二章、第三章分别对系统中采用的流量计的选型， rs - 232 、 rs - 485传输标准及i ~ 2c总线技术加以简单介绍；第四章介绍了电话网中的数据传输，重点讲述了adsl ；第五章探讨了pstn监测系统的具体实现，包括芯片的选择、电路原理图的设计、软件设计。
