和电路

The key part of light alarm circuit of the system is the flashing tube and the life level of the main charge and discharge capacitance. Thus ,in this design, adopted autotransformer step-up type, two-level filter and double flashing tube, in order to light the burden of the main charge and discharge capacitance, reduce the heat productivity and extend the life level of the capacitance.

在系统的光报警电路中关键部件是频闪管和主充放电容的寿命，因此在电路设计中采用自耦变压器升压方式和双级滤波、双频闪管等独特的电路结构，减轻主充放电容的负担，减少发热量，延长电容使用寿命。

In this paper,first,we analyse and design the main circuits of the power supply,and we explain how to use the three-phase spwm wave generator SA4828,and then we also explain the IGBT drive module EXB841,after that,we discuss the IGBT buffer circuit and the protective circuits of the system.finally,we discuss the process of the software design.

在本文中，我们首先对电源主电路进行分析与设计，然后对SA4828三相SPWM波发生器的使用和编程进行了介绍，还对IGBT驱动模块EXB841进行了介绍，另外，我们还讨论了IGBT管的缓冲电路和系统的保护电路，同时分析了系统的软件设计过程。

This design separately uses series linear constant voltage circuit, series regulate constant current circuit and the feedback type contravariant circuit to design direct current constant voltage power supply, direct current constant current power supply and DC-DC converter.

本设计分别用串联型线性稳压电路，串联调整式稳流电路和反馈式逆变电路设计直流稳压电源，直流稳流电源和DC-DC变换器。

This paper describes a design approach of an improved microstrip interdigital filter by Ansoft' Desinger software.

0引言微波带通滤波器是现代电子系统中的关键部件之一。在实际应用电路中，微带滤波器容易与其他无源微波电路和有源微波电路器件集成，实现微波部件和系统的集成化。

During the design process of low voltage equipments using flow chart and state matrix , the distributing control functions using Karnaugh map can satisfy the demand for the design of sequential circuits with/without intermediate states.

用流图法和状态矩阵设计低压电器电路时，卡诺图法分配控制函数能较好满足无过渡态和有过渡态的时序电路设计。本文分别给出了两种电路的设计实

Also, we select the signal collecting circuit of three output polars, the coupling circuit using capacitance and resistance, the alternating amplify processing circuit, the positive feedback retardation comparsion, the driving circuit of output current and the stabilization voltage supply circuit.

选择了InSb磁阻三端输出型信号采集电路，阻容耦合型交流放大电路，正反馈迟滞型电压比较器和大电流推挽驱动电路及稳压电源电路。

In this paper, we present a low phase-noise oscillator circuit. The circuit of an inductor-capacitor tank oscillator is made on the chip. The 0.25μm complementary metal-oxide-semiconductor process parameter of Taiwan Semiconductor Manufacturing Company are entered into Advanced Design System software to simulate an LC tank oscillator circuit. Some circuit technology and an improved method for phasing noise are introduced.

此文提出一个低相位杂讯振荡电路，这电路完全实现於晶片上的电感电容压控振荡器，我们是把台湾积体电路的0.25μm的CMOS（互补式金属氧化物半导体）制程参数放入Advanced Design System模拟软体中模拟，在本文中我们介绍了一些电路技术和改善相位杂讯的方法。

First, the scattering parameters of PT are transformed in to Y-parameters and equivalent "p" circuit model could be established. Second, vector fitting method is used to approximate admittances of equivalent "p" circuit model by rational functions. At last, a circuit synthesis method for rational functions is applied to build circuit model.

该方法首先将测量得到的互感器的散射参数转化为导纳参数并构建互感器的p形等值电路；然后，应用矢量匹配法对p形等值电路的导纳参数进行有理函数逼近获得它们部分分式和形式的频域表达式；最后采用电路综合方法构建出导纳元件的等值电路。

This paper attempts to associate PFC technology with Quasi-Resonant DC/DC Converter and Synchronous Rectifier technology, to work out a novel switching power supply with higher efficiency and low contamination, which both achieved high power factor, improved effecting on electrical network and ensured high efficiency, furthermore, it is easy to be realized and controlled in circuit.

本文首先阐述了开关电源、功率因数校正技术和同步整流技术的发展及现状，对DC/DC变换的拓扑结构进行了选择，确定了带有隔离的准谐振(Quasi-Resonant)反激型电路，可以有效地降低损耗；接着本文对几种常见的PFC拓扑电路进行分析对比，从中选择了BOOST型电路，对工作在临界状况下的电路进行了分析，采用跟随输入电压的升压变换新技术，减小了电感体积，同时降低了开关管的电压应力，既简单又有效地实现了功率因数校正，并发现此技术值得推广；由于反激型变换器的效率一般都较低，所以本文在传统同步整流技术基础上对其加以改进，设计出一种新颖、高效的同步整流方案。

A CMOS front-end ASIC for semiconductor radiation detectors is proposed.The ASIC comprises a charge sensitive amplifier,a gm-C type shaper,a peak detect and hold circuit,and two discriminators.The PDH and the discriminators,together with some logic circuits,provide the capability to reject trailing edge pile-up.The circuit has been designed in a 0.5?

提出了一种用于半导体辐射探测器读出的CMOS前端电路，该ASIC电路包含电荷灵敏放大器、跨导-电容型脉冲成形器、峰值检测/保持电路和甄别器，后两者结合一些逻辑电路实现了抑制脉冲成形器输出波形尾缘堆积的功能。

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。