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In this paper, the design scheme of an agile microwave frequency synthesizer which adopts DDS+PLL is discussed.

本文讨论采用DDS+PLL的捷变微波频率合成器的设计方案。

The main content of this dissertation includes: 1. Research on the theory of ultrasonic power supply, introduce its development process. On the basis of these, fix on the scheme of medical ultrasonic low-power supply. 2. According to the principle of modularized design, divide medical ultrasonic low-power supply into four parts. They are power amplify circuit, power control circuit, frequency automatic tracking circuit and matching circuit. Separately research on their theories and design their circuits and necessary programs, especially, effectively resolve the problem tracking the supersonic vibration system with a narrow syntony frequency bandwidth and a high swing. 3. The matching experiments gain good result, and prove that medical ultrasonic low-power supply is entirely up to the mustard on intellectualization, wide band of working frequency, steady output and high efficiency.

本文工作的主要内容包括： 1、研究了超声功率电源的原理，并回顾了它的发展过程，在此基础之上确定本文医用小功率超声电源的设计方案； 2、按照模块化的设计原则，将医用小功率超声电源的设计分解为功率放大电路、功率控制电路、频率自动跟踪电路和匹配电路等四个部分，分别研究了各部分的原理，在此基础之上进行了具体的电路设计和程序设计，尤其是有效地解决了对谐振频率带宽窄振幅高的超声振动系统的频率跟踪问题； 3、通过与超声振动系统的各项配合实验，取得了很好的实验结果，验证了医用小功率超声电源完全满足智能化、工作频带宽、输出功率稳定、输出效率高的设计要求。

According to the characteristic of excitation control system of small and medium synchronous generators, DC chopping circuit is presented based on scheme simulation.

本论文在方案论证和仿真的基础上提出斩控式励磁控制主电路。

Based on the analysis of theories, methods and problems about many kinds of PD monitoring and fault diagnosis ES in China and foreign countries, a combination scheme about PD on-line monitoring and diagnostic system of large turbine generators was put forward to supply the technical base for the reliable running of generators.

在分析总结了国内外发电机局部放电监测与故障诊断专家系统的理论与技术以及存在的问题后，提出了大型汽轮发电机局部放电在线监测与诊断系统的组合解决方案，为实现发电机的可靠运行提供了技术基础。

After the characteristics and development of excitation system of synchronous generators are analyzed, micro-computer regulating theory of excitation system is discussed, this dissertation presents a scheme of designing excitation system with Programmable Computer Controller and IGBT, and PCC IGBT excitation system of turbine generator is also developed according to the above mentioned.

本文在全面分析同步发电机微机励磁装置特点及发展现状的基础上，论述了微机励磁调节的原理，提出基于可编程计算机控制器控制的绝缘栅双极晶体管励磁系统的设计方法，并在此基础上开发了基于PCC控制的水轮发电机IGBT励磁系统。

Finally, an available systolic matrix system scheme based on DSP is given.

最后，给出了用DSP实现脉动矩阵的系统方案。

The design scheme of equal-accuracy digital tachometer on FPGA is proposed by using equal precision for frequency theory in this paper.

本文利用等精度测频原理，提出了基于FPGA 的等精度数字转速表的设计方案。

When they take counsel together against me, They scheme to take my life.

他们一同商议攻击我的时候，就图谋要害我的性命。

Do not take the "easy way out" or fall for any "get rich quick" scheme...

不要妄想世界上有什么捷径可言。

14 If at any time a takeover bid is made, or a scheme of arrangement is proposed, in respect of a

如果在任何时候发生收购要约，或被建议执行和解计划，就证券而言，客户始终有权在此

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"