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The core circuit adopting differential negative resistance structure with resistor feedback achieves good phase noise performance.The 2 bit switch capacitor array provides extra tuning range.The output buffer of common source structure is of decent reverse isolation.

电路核心采用带电阻反馈的差分负阻结构，因此具有良好的相位噪声性能；2bit的开关电容阵列进一步提高了电路的调谐范围；共源级输出缓冲提供了较好的反向隔离度。

Connect down the folio pass the steady pressing the design proceeding of the unit electric circuit of the power supply to expatiate detailedly with explain, pass the large quantity electric circuit diagram to proceeded the elucidation with writing to the work principle of the unit electric circuit, combine to introduce the MC7107 A/ D transformation machine internal composing, lead the feet function and its the basic principle that proceeding convert.

接下来对开关稳压电源的单元电路的设计进行了详细的阐述和说明，通过大量电路图和文字对单元电路的工作原理进行了说明，并介绍了MC7107 A/D变换器的内部构成、引脚功能以及其进行转换的基本原理。

In the analysis of the circuit, the differential equation based on the theory of electromagnetism had been established; the circuit qualitatively had been analyzed, and the current on the coil in the process of experiment had been calculated.

在电磁压制放电电路的模拟分析中，基于电磁学理论建立了放电过程的微分方程，对电路作了定性的分析；通过对实验参数的模拟，求解出实验过程中线圈上的载荷电流。

The restriction of equivalent transformation analysis method is discussed and finally a proper method and the result of the analysis are offered.

在单端输入的差动放大电路工作原理教学中，对共模反馈电阻R e的作用，往往采用等效变换法进行分析，如果不注意正确使用分析条件会得出错误的结论，本文从理论和实践上指出了利用这种分析方法分析单端输入差动放大电路的局限性，最后给出了正确的分析方法及结论。

Students have to study how to efficiently use the tools for performance measurement on basic circuits through observation.(3) The un-ideal performance of circuits such as frequency response and noise.(4) Feedback, Operational amplifier and the stability in feedback system.

通过观察对基本电路性能的量化建立有效的分析工具(3)频率响应和噪声等电路的非理想性的介绍(4)反馈，运放和反馈系统中的稳定性。

The prerequisite of the correct use of karnaugh map is to full in the map with the given logic function correctly. Karnaugh map can be used to transform logic function into various simplest expressions and check the race and hazard of logic function. It has a wider range of important applications in the analysis and design of combinational logic circuit and sequential logic circuit.

正确运用卡诺图的前提是把给定的逻辑函数正确填图，可以利用卡诺图将逻辑函数化简为各种最简表达式；可以用来检查逻辑函数的竞争冒险等；在组合逻辑电路和时序逻辑电路的分析与设计中更有广泛的重要应用。

Dinger equation is achieved, but also the resistance phase problem in the equation is skillfully solved. With a unitary transformation, the finite-differenced Schr?dinger equation becomes a standard Mathieu equation in p?

通过合适选取系统哈密顿的形式，不仅能够实现介观含源RLC电路的量子化，给出该电路的瞬态薛定谔方程，还可以解决电阻给薛定谔方程的求解带来的困难。

One is auto-zero and the other is chopping. The chopping amplifier with its many parts of modulation switches, pre-amplifier, band-pass selective amplifier, and voltage follower and demodulation switches is designed. The circuit is simulated with HSPICE to optimize. The residual offset of microvolt and the equivalent input noise PSD of 70 nV /Hz were obtained.

zero和斩波Chopping 对失调和噪声的影响，具体针对传感器的信号要求进行了斩波放大电路的调制，预放，带通选择放大器，电压跟随和解调等各个部分的设计，电路使用Hspice进行了仿真优化，达到了微伏量级的残余失调和70 nV /Hz输入等效噪声PSD。

Summary This paper analyzes the working principle and stability of a transistor mul- tivibrator operating as a frequency divider,with both sides being synchronized by the input signal.It is found that the frequency division stability of this circuit can further be increased when the multivibrator operates in the second class of oscillating condition,and that the optimum operating point is best determined from the actual base voltage changing characteristic.

本文分析了晶体管自激多谐振荡器用作双侧同步分频电路的一般理论和分频稳定性，并考虑基极电压变化规律来确定最佳分频的工作状态和运用点，同时对同步脉冲的引入问题亦作了原理性补充，还提出了振荡于第二类状态下的自激多谐振荡器可获得高稳定性的分频，以及此类双侧同步分频电路的设计方法。

The operating principle and hardware configuration of the instrument based on AT89C51 for testing breakdown voltage of the dielectric oil is introduced. The method to collect the breakout current through photoelectric isolation is proved when the dielectric oil was broken out. The question about the system work stability in the condition of strive electromagnetism interfere is proposed.

介绍了 AT89C5 1单片机控制的绝缘油耐压测试仪的工作原理及硬件结构，探讨了在绝缘油击穿时，通过光电隔离采集击穿电流的方法，解决了在高压击穿瞬间和强电磁场干扰环境下，微机电路实行有效复位并使系统稳定工作的问题，给出了基于 MAX70 6为核心的高可靠复位电路的实现方法。

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。