和电路

In order to solve the problem of error and interfere to the system by manual regulation, a programme-controlled scheme in sensitivity throw-over of charge convert and gain throw-over of output amplifier has been proposed in this paper.

并在电荷转换部分的灵敏电容的切换和输出放大级的增益切换电路中提出一种程控方法解决的方案，并进行了详细的理论分析，从而解决了手动调节容易给系统带来误差和干扰的问题。

The article introduces communication theory of FM at first, recommend one more pair of sound receive the basic operation principle of telephone transmitter MT8888C and commonly used work pattern frequently more, then regard realizing receiving and dispatching DTM F signal as the typical interface circuit that the example provides MT8888C and 89C51 and control the software.

文章首先介绍了FM的通信理论，再介绍双音多频接收发送器MT8888C 的基本工作原理和常用的工作模式，然后以实现收发DTM F 信号为例给出了MT8888C 与89C51 的典型接口电路和控制软件。

Some rules of how to lay out drive signal wire was given.

搭置的实验电路完成了闭环调节和功率控制功能，试验结果验证了本文理论研究和设计方案的可行性与正确性。

At first the current sampling values pass through virtual digital CVTs. And then the voltage and current sampling values are processed by a low pass filter. According to the instantaneous value of transmission line voltage, the current instantaneous values of shunt reactors and P equivalent circuit capacitance can be calculated. After removing these two kinds of current, sampling value differential protection based on all components and fault component can be applied.

由线路电压瞬时值分别实时计算出流入并联电抗器和流入线路Π型等值电路两侧电容的电流瞬时值，再从线路每侧电流除去这两部分电流，用得到的新电流瞬时值作常规采样值差动和故障分量采样值差动保护计算。

Then it schemes the hardware circuit and software program to realize short-distance communications between single chip and PC.

利用89C51和PC机上已有的串行口设计出硬件电路和软件编程从而实现单片机与PC机短距离的简单通信。

Wireless sensor network becomes popular due to the rapid development of IT, MEMS and IC technology. Features such as low electricity consumption, low cost, small size, self-adjustable and capable of wireless communication make it a good tool to develop ambient intelligent system.

低耗能，低成本，体积小，可自我调适和允许讯号无线传输的无线感测网路是近年来通讯科技、微机电和积体电路迅速发展的产物，在应用上可发展成为建构智慧环境的工具。

But there was no current modulate circuit for TDLAS system.The design of modulation circuit for tunable diode laser based on DDS has been introduced.The main idea of design is using MCU to control DDS and D/A chips,so we can get sine wave and saw tooth signals.

DDS器件采用高速数字电路和高速D/A转换技术，具备了频率转换时间短、频率分辨率高、频率稳定度高、输出信号频率和相位可快速程控切换等优点，可以实现对信号的全数字式调制。

Special characteristics of SOI devices are used in the design process.

在设计过程中，利用SOI器件所具有的特性，对电路进行精心的设计和层次化版图绘制，通过对关键路径和版图后全芯片的仿真，使得芯片一次流片成功。

The status quo of the development of the high voltage high power conversion technology is summarized in chapter 1 and two interrelating technology developments - power switching devices and digital control technology, are introduced. In chapter 2, the topologies of multilevel converters and control schemes are summarized. Moreover, their advantages, disadvantages and application fields are also analyzed and compared.

本文首先在第一章中对高压大功率变流技术研究现状进行了回顾，并对与多电平变流技术紧密相关的电力电子功率器件、数字控制技术的发展情况做了介绍；第二章对目前多电平变流器的电路拓扑和控制策略进行了总结，并将各自的优缺点和应用场合加以分析、比较。

Based on summary of researches at home and abroad,the regenerative circuits suitable for ASD are classified and explained,the working principle and realization of each method are analyzed and discussed.

基于对国内外研究现状的总结，对适用于电机变速驱动的再生电路进行了分类说明，分析和讨论了各种方法的工作原理和实现方法。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。