| 单词 | 频率合成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 | 频率合成 —frequency synthesisSee also:合成—synthesis • compose • mixture • constitute 合成 n—composite n • compound n
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我们将概要说明直接数字频率合成系 统 的工作原理，并提及DDS引擎内部在高电平下工作的情况。 analog.com | We will give a basic review of how a direct digital synthesis system works, touching on the inner workings of the DDS engine at a relatively high level. analog.com |
本研讨会涉及：频率产生的需求；过去、现在及未来的技术；如何评 估 频率合成 器 的 性能；以及实际应用。 analog.com | This webcast looks [...] at the need for frequency generation, the techniques from the past present and future, and how to assess the performance of a frequency synthesis, and [...]real world applications. analog.com |
我们提供单锁相环（PLL）和双PLL以及小数N分频和整数N分频 的 频率合成 器 ， 它们都有具业界一流的高性能、低相位噪声和高集成度。 analog.com | ADI ‘s leading PLL synthesizers family includes single and dual PLLs as well as fractional-N and integer-N, and highly integrated PLLs with VCOs. analog.com |
公司的SY89610L是一个具有精确 频率合成 器 的低压抖动产品。 tipschina.gov.cn | The Company's SY89610L [...] is a Precision Frequency Synthesizer featuring [...]ultra-low jitter. tipschina.gov.cn |
关于频率合成的原理分为两个部分，这是第二部分，主要介绍直接数 字 频率合成。 analog.com | The second of a two-part series on frequency synthesis, with an introduction to Direct Digital Synthesis. analog.com |
基础调制算法和DDS（直接数字 频率合成 ） 为 设计人员生成极性编码载波信号提供全数字化技术。 analog.com | Basic modulation mathematics and DDS (direct digital synthesis) provide designers with an all-digital technique for generating polar-encoded carrier signals. analog.com |
此外，还将讨论针对频率合成需求 选择PLL和DDS技术时的权衡考量。 analog.com | We will also discuss the tradeoffs between PLL and DDS technology as a [...] base choice for frequency synthesis needs. analog.com |
完全集成的锁相环(PLL)可同时针对接收和发射提供高性能、低功耗的小数N分 频 频率合成。 analog.com | The fully integrated phase lock [...] loops (PLLs) provide high performance and low power [...] fractional-N frequency synthesis for [...]both receive and transmit sections. analog.com |
这款工具的作用是帮助用户选择和评估ADI公司的直接数 字 频率合成 器 (D DS) IC。 analog.com | The purpose of this tool is to assist a user in selecting and evaluating Analog Devices, Direct Digital Synthesis (DDS) IC's. It allows a user to select a device, enter the desired operating conditions and evaluate it's general performance. analog.com |
基于直接数字频率合成器的 时钟系统的时间抖动 analog.com | Jitter in Direct Digital Synthesizer-Based Clocking Systems analog.com |
Texas Instruments [...] 的 LMX2581 是一款超低噪声、宽带频率合成器， 它集成了三角积分型小数 N [...]分频 PLL、带有全集成振荡电路的 VCO 和一个自选型分频器。 digikey.cn | Texas Instruments' LMX2581 is an ultra [...] low-noise, wideband frequency synthesizer which [...]integrates a delta-sigma fractional N PLL, [...]a VCO with fully integrated tank circuit, and an optional frequency divider. digikey.be |
它用直接数字频率合成（DD S）技术实现这种性能和功能水平。 keithley.com.cn | It uses direct digital synthesis (DDS) techniques [...] to achieve this level of performance and functionality. keithley.com |
HMC1032LP6GE [...] 和 HMC1034LP6GE 提供可编程频率合成功能（从 125 MHz 至 3 ghz），与其基准时钟是整数和小数 [...]N 关系的情况下。 digikey.cn | The HMC1032LP6GE and the HMC1034LP6GE [...] offer programmable frequency synthesis from 125 [...]MHz to 3 GHz in both integer- and fractional-N [...]relationships to their reference clocks. digikey.be |
DigitalEngineerZone 直接数字频率合成器支持社区。 analog.com | Direct Digital Synthesis Support Community on EngineerZone. analog.com |
低功率直接数字频率合成器核 心具有高集成度 analog.com | Low-power direct digital synthesizer cores enable high level of integration analog.com |
在无线接收器和发射器的向上、向下转换选择过程中，Analog Devices 的 ADF41020 频率合成器可用于实现高达 18 GHz 的本地振荡器。 digikey.cn | The ADF41020 frequency synthesizer from Analog Devices can be used to implement local oscillators as high as 18 GHz in the up conversion and down conversion sections of wireless receivers and transmitters. digikey.be |
ADI的DDS（直接数字合成）IC处于世界领先水平，集成多种功能（板载比较器、RAM、PLL、混频器和寄存器），无论用于通信，抑或测试设备和雷达系统，都是理想而灵活 的 频率合成 器 解 决方案。 analog.com | DDS (direct digital synthesis ICs) from Analog Devices are world-leading and incorporate various features (on board comparators, [...] RAM, PLLs, mixers and registers), making [...] them ideal agile frequency synthesizer solutions [...]in systems from communications to test equipment and radar. analog.com |
直接数字频率合成器公 认具有高精度数字调谐、低噪声系数和相位连续跳频能力，比模 拟 频率合成 解 决方案更有吸引力。 analog.com | Direct digital synthesizers are known for their highly accurate digital tuning, low noise figure, and phase-continuous frequency-hopping capabilities, which make them more attractive than alternative analog frequency-synthesis solutions. analog.com |
如果您使用 Jabra LINK [...] 850 遇到问题，可能是由于模拟电话或 2 线电话系统不适应无线电频率干扰所 造 成 的。 jabra.cn | If you are experiencing issues with the Jabra LINK 850, it might be [...] due to the analogue phone or the fact that the 2-wire telephone system is not [...] tuned into radio frequency interferences. jabra.com |
AD9915 采用先进的 DDS 技术，连同内置的高速、高性能 DAC，构成完整的数字可编程高频合成 器 ， 能够产生高达 1.0 GHz 的频率捷变模拟输出正弦波。 digikey.cn | The AD9915 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a [...] digitally programmable, [...] complete high frequency synthesizer capable of generating a frequency-agile analog [...]output sinusoidal waveform at up to 1.0 GHz. digikey.be |
视频：联合国儿童基金会通讯员苏珊娜.波克斯报道全球金融危机和目前正在蔓延的艾滋病对莱索托 造 成 的 影 响。 unicef.org | VIDEO: UNICEF correspondent Suzanne Beukes reports on the impact of the global financial crisis and the ongoing AIDS pandemic on children in Lesotho. unicef.org |
2011 年 11 月，政治部和禁毒办联合率领的联合 国赴贝宁和尼日利亚机构间访问团得出的结论说，几 内亚湾频繁发生海盗行为对该区域各国的和平、安全 与经济利益构成重大威胁。 daccess-ods.un.org | In November 2011 a United Nations inter-agency mission to Benin and Nigeria, co-led by DPA and UNODC, defined the incidence of piracy in the Gulf of Guinea as a major threat to the peace, security and economic [...] interests of States in the region. daccess-ods.un.org |
政府间气候变化专门委员会的最新调 查结果表明，由于全球变暖，气候灾害的发 生 频率 和 规 模可能增加，如洪水、飓 风、荒漠化、甚至大片土地“沉降”等，从而导致越来越多的人流离失所 ( 联合 国，2009a)。 daccess-ods.un.org | The most recent findings of the [...] Intergovernmental Panel on Climate [...] Change indicate that the frequency and magnitude of climate-related disasters, such as flooding, hurricanes, desertification or even the “sinking” of stretches of land, are likely to increase as a consequence of global warming, and thus will further displace an ever-increasing number of people (United Nations, 2009a). daccess-ods.un.org |
根据执行局第一八九届会议开展的讨论以及提出的指导意见，总干事将在第一九 0 届 [...] 以及其后几届会议上提出具体的建议，将根据情况涉及如下领域：(i) 执行局报告文件及其 频率的合理化；(ii) 使用的语言；(iii) 正式记录的安排；(iv) [...] 执行局代表享有的差旅和日补 贴；(v) 根据未来 C/5 文件的编制周期重新安排大会的议程；(vi) [...]简化大会的程序；(vii) 对教 科文组织所有治理结构的规则和程序、最佳做法以及治理方案的协调问题开展研究。 unesdoc.unesco.org | Following discussions during the 189th session of the Executive Board, and in line with the guidance given, the Director-General is ready to provide detailed proposals at the 190th and subsequent sessions, as the case may be, covering such areas as: (i) [...] rationalization of Executive Board reporting [...] documentation and frequency; (ii) use of languages; [...](iii) official records arrangements; [...](iv) Executive Board representatives travel and DSA entitlements; (v) rearrangement of General Conference agendas in line with the future C/5 document programming cycle; (vi) simplification of General Conference procedures; (vii) study of best practices and harmonization of governance arrangements, rules and procedures in all governance structures of UNESCO. unesdoc.unesco.org |
另一方面，气候变化影响的性质、强度、 频率和时 间上的不确定性，可能人为地夸大了 资源对解决适应问题的重要性，从而 造 成 额外 的资金约束，削弱了经济效率。 undpcc.org | On the other hand, uncertainty on the [...] nature, intensity, frequency and timing of impacts may artificially enlarge the magnitude of resources needed to tackle the problems of adaptation thereby creating additional [...]financial constraints and diminishing economic efficiency. undpcc.org |
气候变化的影响对于许多太平洋岛屿发展中国家 构 成 了 真正的威胁，其 中有几个已经受到了风暴潮和洪水强度 和 频率 上 升 的困扰，而这些又反过来 威胁着它们的淡水供应。 daccess-ods.un.org | The impacts of climate change posed a real threat to many Pacific island developing [...] nations, several of [...] which were already suffering from a higher intensity and incidence of storm surges and flooding, which, in turn, was threatening [...]their freshwater supply. daccess-ods.un.org |
这种税可能影响 汽车的大小、消费者使用频率，也 可能对一些驾车 者造成大小 不一的负面经济影响，例如在农村地 区、低收入但依赖汽车出行工作的人群。 undpcc.org | They may affect the size of the cars and how extensively they are used by consumers, but may [...] have disproportionately [...] negative financial impacts on some drivers, such as, those in rural areas [...]and with low incomes who [...]depend on cars to travel to work. undpcc.org |
对于为什么选择由基本建设总计划施工经理来负责永久广播设施项 目的采购，咨询委员会提问后获悉，这一选择有利于提高 效 率 ， 同 时降 低潜在的风险和减少重复工作，因为基本建设总计划施工经理全面负责 确保总计划的所有组成部分结合成为 一个完整的整体，并按照时间表进 行建造和投入使用。 daccess-ods.un.org | Upon enquiry as to the reasons for the selection of the construction manager for the capital master plan for the [...] permanent broadcast [...] facility project, the Advisory Committee was informed that this choice would allow increased efficiencies while mitigating the potential risks and duplications, given the fact that the construction [...]manager for the [...]capital master plan has the overall responsibility for ensuring that all the components of the plan are fully integrated, constructed and deployed according to schedule. daccess-ods.un.org |
不过，本组织必须有充分的理由 来保证该系统同现有的其他解决方案相比，确实是最 适 合 其 需要的、并能实现 效 率 、 成 本效 益和方便用户这三方面最佳结合的系统。 unesdoc.unesco.org | However, the Organization must have reasonable assurance that this system would indeed be best suited to its needs offering the best possible combination of efficiency, cost-effectiveness and user-friendliness, compared with the existing alternative solutions. unesdoc.unesco.org |
就拟设立一个区域信息和通信技术处(见上文第 21 至 23 段)而言，拟将处长 P-5 [...] 员额改叙为区域信通技术处处长 D-1 员额，任职者除其他外，将参加区域会 议并提供战略投入；在通过本国基础设施提供服务领域，以及管理复杂的无线电 频率问题方面，同部长级高级官员进行沟通；并率先统一向本区域 联 合 国 其 他实 体和执行伙伴提供支助(同上，第 91 段)。 daccess-ods.un.org | With regard to the proposed establishment of Regional Information and Communications Technology Services (see paras. 21-23 above), it is proposed that the P-5 Chief of Service post be reclassified to a D-1 Chief of the Regional Information and Communications Technology Services, who would, inter alia, participate in regional conferences and provide strategic input; interact with senior officials at the ministerial level in the areas of service delivery through national infrastructure [...] and in the management of complex radio frequency issues; and take the lead in the harmonization of support to other United Nations entities and implementing partners in the region (ibid., para. 91). [...] daccess-ods.un.org |
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