AD9858在超短波无线电通信领域中的一种应用

介绍了AD9858在超短波无线电通信领域中的一种应用.基于AD9858设计一种频率合成器,该频率合成器采用"DDS 倍频"的方案,具有相噪低、跳速快等优点,可用于超短波无线电通信系统.     

一种新颖的星载宽带频率源设计

针对应用于复杂空间环境的宽带接收机的需求,提出了一种新颖的频率源设计方案 。采用锁相环（PLL）和倍频电路实现宽带频综,采用直接数字频率合成器（DDS）实现窄带 细步进频综。给出了频率源的详细设计思路、实现方法及可靠性设计的相关内容,实测 结果表明所设计的频率源各项指标均满足要求。     

DDS在SystemView上的仿真设计

本文介绍了直接数字频率合成器（DDS）的工作原理和System View的应用，并使用SystemView建立了DDS的仿真系统，得到了相位截断对DDS的影响的仿真结果，对研究和设计DDS系统有着实际意义。     

《电讯技术》专题资料《时间频率技术》题要（十七）

DDS在LFM设计中的应用（樊淑慧） 介绍了DDS＋正交混频技术产生LFM信号的原理和方法，并给出最终设计结果。就如何改善DDS输出杂散进行了探讨。同时还对正交混频技术的优缺点进行分析，并提出了切实可行的解决方案。     

数字频率合成器DDS的matlab实现

利用matlab仿真工具建立数字频率合成器DDS的仿真模型,便于我们直截了当地了解DDS的工作原理和各部分模块的功能,而且便于我们分析DDS的工作性能和各种参数指标。     

C频段频率合成器设计

DDS与PLL的组合方式通常有两种，PLL内插DDS和DDS激励PLL的组合方式。本文充分利用了这两种方式的优点，实现了一种能完全覆盖C频段的宽带低相位噪声频率合成源设计。首先在理论分析的基础上给出了设计方案，然后对其可行性进行了论证，最后用实验结果证明了该方案的正确性。     

法国DDS软件公司研制出新型采购资源搜索软件

为了让供贷商、采购方、承运人等各方从业者通过一个网络门户互相合作，实时地交流与采购资源有关的信息，选择量价比最好的供贷商，法国在运输管理系统（TMS）领域领先的DDS软件公司开发了国际资源搜索软件模块。     

面积优化的正交DDS软核编译器设计与实现

为了使直接数字频率合成器(DDS)的IP设计达到资源和效率的较好平衡,提高此类IP设计的灵活性和重用性,应用泰勒插值方法对ROM进行压缩,设计并实现了一种自动生成正交DDS软核的编译器。文中推导了正交DDS内部信号关键参数设定公式,描述了IP编译器的设计流程,给出了实验结果。     

DDS+PLL组合系统及实例

本文介绍了DDS PLL系统的实现方案和特点,指出了设计DDS PLL系统的注意事项,并通过实例证明DDS PLL系统能够实现较高的频谱质量,具有一定的实用价值。     

一种基于FPGA的任意锁相倍频算法

提出了一种基于FPGA的任意锁相倍频算法。通过对倍频系统总体结构的分析，提出了实现该算法的原理及其具体的设计方法，同时提供了一个基于FPGA器件完成的设计实例。仿真和实测结果表明了该算法的正确性及可实现性，并在实际的项目中验证了该算法的良好性能。     

Public Financial Expenditure——A Reflection of the Livelihood Improvement

In recent years.China's public finance put social construction high on the agenda and attaches more importance on livelihood insurance and improvement.The 2003-2007 public financial expenditure reflects a fact that the government isputting more emphasis on livelihood andissues concerning the people.     

Voices from the MPC and CPPCC

"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations."     

Slowdown Trade Surplus Growth

According to Ma Kai＇s economic planning report submitted to the NPC session on March 5th,（Ma Kai is the Minister in charge of the National Development and Reform Commission）,the government has listed the slowdown in trade surplus growth and the steady expansion of external investment as major tasks for 2008.     

Ouyang Riping： A Hero Besides Entrepreneur

A bout fifty years ago. a baby＇s cry broke the sky of quietness, in a small and beautiful town of Hunan province, which surroundcd by green hills and clear water. Though his .birth brought his family great happiness and hope just as any new life, nobody knew that the little boy would get great achievement when he grow up. even start his business oversea, and earn international honor. Let＇s share with you the entrepreneur Ouyang Riping＇s story, which may insights thcsc people who want to succeed and complete oneself in favorite condition or adversity rather leave things to so-called fate.     

Belarus, A Chinese Fort in Europe

＂In recent years, we＇ve found increasing interest from Chinese investors in the Belarus economy. Please let China know, Belarus is always ready to be a true friend to China. We have built a fort in Europe for China,＂ the President of Belarus, Alexander Lukashenko told Zhou Xiaochuan, President of the Bank of China, during his visit to the capital of Minsk, on January 8th, he expressed his high praise and firm confidence in the development of Sino-Belarusian relations.     

What＇s Behind Spring Festival？

Similar to what the Christmas Day means for the westerners,the Spring Festival is the most important celebration for Chinese people.This big event according to Chinese traditional lunar calendar relaxes and pleases the whole country as the happiest gathering time of the year.National-wide crusade for going back home,too-difficult-to-get train tickets,generous family-going-out shopping,Miaohui laundering,New Year Eve reunion dinner,visiting friends and relatives,watching annual TV gala......each piece of clue reminds us of the smell of Chinese Spring Festival.     

KEY WDRDS for Foreign Investment in China

FDI(Foreign Direct Investment),a component of a country's national financlal accounts,is investment of foreign assets into domestic structures,equipment,and organizations.It does not include foreign investment into the stock markets,concession and subcontract.FDI iS thought to be more useful to a country than investments in the equity of its companies because equity investments are potentially "hot money"which can leave at the first sign of trouble,whereas FDI is durable and generally useful whether things go well or badly.     

Universal Coverage, Pinpoint Illustration and Profound Impact HTC 2008 Intermedia Recommendation and Introduction Meeting

Holding 88 percent of train media resources across China, based on "Time Cube", on the 2008 Intermedia Recommendation and Introduction Meeting on December 19, 2007, HTC announced its high-profile strategy of tour marketing and tapping the immeasurable potentials on the train. Meanwhile, HTC officially launched its brand new product Olympic Train on the meeting, providing a fabulous platform for all the brands that are prepared to do a smart marketing on the occasion of 2008 Olympic Games.     

Market presence in China strengthened Network growth and Dual-Chinese-Hub Strategy More frequet Flyer Benefit——Air China and shanhai Airlines Join Star Alliance

In the end of 2007, Air China Limited (hereinafter "Air China") and Shanghai Airlines, formally joined Star Alliance at a ceremony held in the new Terminal Three at Beijing Capital International Airport. With the addition of the two Chinese airlines, Star Alliance now has 19 member carriers operating 17,000 daily flights to 897 destinations in 160 countries.     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.