查询词典 circuit

This paper describes a simple practical Excel 2003 drawing method for electronic circuit diagram,including how to build circuit diagram tool bar ,how to establish document icon,custom-made elements tools,and how to finish circuit diagram drawing,which has in certain extent solved the problem of electronic circuit diagram drawing in the text input process,and thus raised the.

文中从如何创电子线路图工具栏、设置元件图标、定制元件工具、绘制电子线路图等方面，为读者介绍了一种简单实用的Excel 2003绘电子线路的方法，基本解决了非专业人员绘制电子线路图的难题，从而提高了工作效率。

We simulate the circuit with the Agilent ADS, After select the most suitable topology structure of circuit,we simulate the biasing circuit,input and output matching circuit. Through the method of the small signal s parameters and the nonlinear designing method, we design and simulate the drive stage and last stage power amplifier with ADS software, point out some problem in the design procedure.

设计软件采用Agilent ADS软件进行仿真设计，在选定合适的拓扑结构后，对放大器的静态偏置点、输入输出匹配电路进行仿真，通过应用小信号S参数设计方法和非线性设计方法分别设计了驱动级和末级放大器，指出了设计过程中的一些问题。

What integrated circuit designs job is flourishing bring many design verification to test requirement, check the one link in catenary of industry of since integrated circuit, also be the crucial point that test and verify of integrated circuit product leaves factory, bougie gets stuck even if upright between automatic test system and IC chip, the accurate interface that parameter of IC product function checks before be being used at enclosing gets stuck, the design of it and integrated circuit and test are enclosed inseparable.

集成电路设计业的畅旺带来大量的设计验证测试需求，测试既是集成电路工业链中的一环，也是集成电路产物验证出厂的要害，探针卡就是介于主动测试系统与IC芯片之间，用于封装前测试IC产物性能参数的慎密界面卡，它与集成电路的设计和测试封装密不成分。

This paper precisely conducts the special topic research in view of some important technologies of the digitized control module.(1) AC motor control circuit of PAN/TILT is designed ,which speed is controlled by AT89C51 MCU. DC motor control circuit of LENS is designed too.(2) The hardware and software of automatic temperature control is designed, which used in camera protect box without A/D IC. A kind of single wire communication IC is used in the circuit. So, the program is given.(3) A method of video switch without picture shock is discussed in this paper, and 16x8 video switch circuit is designed. AT89C51 can carry out time sequence logical control with the sync signals by request..(4) The module of real-time clock is designed, in which, LCM is used, a kind of three-wire communication IC is used too.

1给出了一种由89C51单片机控制的简单易行的交流云台转动变速控制电路，实现了云台及其电动三可变镜头的控制；(2)给出了无需外加A/D、单线通信的防护罩自动温度控制电路，完成了单片机温度控制软件的设计；(3)提出了"无抖动"视频切换的设计思想，给出了16×8的视频切换电路，利用单片机在视频信号的场消隐期控制切换，从而实现了"无抖动"切换；(4)给出了一种三线接口通信的液晶显示实时时钟电路，完成了程序设计；(5)提出了在视频监控系统数字控制模块中，用CAN总线取代传统的RS-485总线，实现PELCO-P协议传输的方案。

S98ZKA0336 VCD UP-GRADING CIRCUIT BOARD FOR A CD PLAYER OR CD-ROM 获证 US 发明 08/815309 5926606 2017/3/9 540,000 Nuvoton 让与 A VCD up-grading circuit board for a CD player or CD-ROM includes an MPEGdecoder, a microprocessor, a DRAM, an audio digital/analog converter, a TV encoder and a synchronous clock generator. The VCD up-grading circuit board for a CD player or CD-ROM is attached to the CD player or CD-ROM to allow the CD player or CD-ROM to play a VCD without additional connection between the VCD up-grading circuit board and the CD player.

S98ZKA0335 自动产生及校正系统同步时钟之影音光碟机升级板获证 TW 发明 86101019 90406 2017/1/29 460，000 Nuvoton 让与本发明系关於一种自动产生及校正系统同步时钟之影音光碟机升级板，尤指一种可附加於CD播放机内而升级为影音光碟播放机之升级用的电路板，此升级电路板为可解决传统升级电路与CD播放机之间同步讯号连接之不便性、易产生干扰与更改CD播放机原有线路所衍生之各项缺陷下，而为一种无需於其间额外连接同步时钟讯号，而在升级板上内建一同步时钟产生器，以随时监视CD播放机与MPEG解码器之左右声道取样时钟讯号之相位差而立即补正，即可达到令两者完全同步者。

Based on the research results of Chaos theory, in this dissertation, it has made detailed analysis of the chaotic signal generator. Firstly, the characteristic and various detection methods of chaotic signal are recommended. Secondly, with the aid of software, such as MATLAB, PSPICE, EWB, etc, discussion of the process of generating chaotic signal proceeds. Through simulation, the output result of several kinds of chaotic circuit are analyzed and compared. Thirdly, aiming at Chuas chaotic circuit, through debugging, the impacts by components and parts in the circuit, such as operation amplifier, capacity, inductor, etc, has been further investigated. And then provides a new scheme to implement Lorenz chaotic system, the circuit design and analysis are presented in detail and it can be realized by the hardware of programmable arrays FPGA, the experimental results indicate that this scheme has the advantages of easy operation, flexible design and high efficiency. An application example in secure communications is also provided. Finally, through picking up the characteristic parameter-Lyapunov exponent of the Chaos we can analyze the performance of different chaotic signal generators.

本文在混沌理论研究成果的基础上，对混沌信号的产生做了详细的分析，涵盖以下内容：首先介绍了混沌的定义，混沌信号的基本特性和各种判别方法，特别是对简单的一维Logistic映射的硬件实现问题做了初步探索；其次对混沌信号的产生方法进行讨论，借助于MATLAB、PSPICE、EWB等仿真软件，对几种混沌电路输出的混沌信号进行了分析比较，并在此基础上针对典型三阶连续自治系统Chua's电路作进一步实验研究，通过混沌电路调试，深入研究电路中各元器件，特别是运算放大器、电容、电感等对混沌信号时域以及频谱的影响；再次研究连续混沌系统的数字化硬件产生，设计了Lorenz混沌电路在现场可编程门阵列FPGA上实现的新方案，在保密通信中的应用实验结果表明该方案具有操作简单、设计灵活、效率高等优点；最后针对不同混沌系统，采取不同算法，提取混沌特性参数Lyapunov指数，进而对不同的混沌信号发生器的性能进行了分析。

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

The fluorescent lamp ballast circuit used MSC60028 with higher power factor is developed,and the system consists of control circuit,boost circuit and contravariant circuit.

开发了一种采用MS C60028 集成功率因数校正芯片构成的高功率因数日光灯镇流器，整个系统由控制电路、升压电路、逆变电路三部分组成。

And the main circuit chart used microsoft office visio to draw up, has realized the filter circuit, the leveling circuit, the contravariant electric circuit's composition design.

其中主电路图使用了microsoft office visio来绘制，实现了滤波电路、整流电路、逆变电路的组成设计。关键字：单片机 V/F控制 HEF4752

The contravariant welding machine main circuit system by the input filter leveling circuit, the contravariant electric circuit, the high-frequency transformer, the output rectification filter circuit is composed.

主电路系统由输入滤波整流电路、逆变电路、高频变压器、输出整流滤波电路组成。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了