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- Low Frequency Synthesizer 低频(电子)合成器
- Dueto using advanced MMIC PLL and VCO,the researched frequency synthesizer has smallvolume,fast switching speed and low phase noise. 选用了微波单片PLL频率合成器芯片、单片集成VCO等先进器件，研制的频率合成器具有体积小、捷变速度快、相位噪声低等特点。
- The RF front-end chip is composed of several circuit blocks including low noise amplifier (LNA), mixer, frequency synthesizer, IF filter and limiter. 射频前端芯片包括低噪声放大器、混频器、频率综合器、中频滤波器和限幅放大器等主要模块。
- Frequency synthesizer is the hardcore of a electronic system. 频率合成器是电子系统的核心部件。
- The work presents the frequency synthesizer based on PLLs. 所以在频率合成器的设计，可分为两个主题。
- The system based on the frequency synthesizer can offer a high accuracy, high stability and low jitter clock for a high speed and high precision backplane test platform. 该时钟板基于频率合成器来产生高精度、高稳定度、低抖动的时钟,用于高速高精度背板测试平台。
- In electronics, undesirable low frequency currents interfering with a desired signal, and usually caused by a poorly screened alternating mains supply. 在电子学领域，一种不希望发生的低频电流，它干扰所要求的信号。通常这种现象是由于交流供电线路屏蔽不良引起的。
- The abnormal colours of seedlings turned a low frequency. 颜色异常的苗木出现频率较低。
- Laser direct writing of micro-OVD with low frequency templates[J]. 引用该论文 魏国军;周小红;周雷;陈林森.
- The disadvantages of DDS (direct digital frequency synthesizer) are rather low output frequency and a large set of the spurious signals, and one reason of the spurious signals is phase truncation. 摘要直接数字频率合成(DDS)的缺点在于输出频率低和存在大量的杂散信号，而杂散信号产生的原因之一就是相位截断。
- It adopts DDS + PLL frequency synthesizer scheme to realize low end frequency 2~4GHz output,then through segment amplifying multiplying chain realize from 2~4GHz expand to 2~12GHz,and the output frequency is selected by microwave switch. 采用DDS+PLL的混合频率合成方案实现低端频率2~4GHz的输出,再通过分段放大倍频链路实现从2~4GHz到2~12GHz的扩频,并由微波开关控制选频输出。
- If it is a low frequency sound, it is processed as an analog signal. 对低频声进行传统的处理。
- This effect is obvious at lower frequency band. 这种效应在振动低频区段更为显著。
- PLL frequency synthesizer with DDS reference will adapt to local oscillator of modern radio. 采用DDS输出作为参考的PLL频率合成器非常适合用做现代电台的本振。
- A Quadrature Direct Digital Frequency Synthesizer (QDDS) based on CORDIC algorithm is presented. 设计了一种基于CORDIC算法的正交输出直接数学频率合成器(QDDS);并在ALTERA FLEX10K 系列FPGA上予以实现.
- The direction of the low frequency current with maximum frequency was also WSW. 低频流出现频率最多的方向和潮流基本一致。
- The fast frequency synthesizer used in the CNI system is discussed in this thesis. 本课题对该系统所需的快速跳 频频率合成器进行了初步的研究。
- Medium SMES (200 MVA) are able to compensate some low frequency disturbance. 中型SMES(200MVA),这类SMES能补偿某些低频度的扰动
- 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。
- Helmholtz resonator has a good noise eliminating performance at low frequency. 亥姆赫兹共振腔具有良好的低频消声性能,被广泛地应用于低频消声方面。
