| 1. | In this paper , a clock recovery system that based on phase control technology is studied
本文设计的锁相环路是基于相位控制技术的时钟恢复系统。 |
| 2. | The components used in the system project are detailed analyzed . all the parts contributed to phase noise are discussed as emphases . this millimeter wave frequency synthesizer has better phase noise and wider band
本文详细分析了本系统方案及其特性，并对其中用到的锁相环路各部件及其对系统相位噪声性能的影响作了重点讨论。 |
| 3. | Through the research of direct digital synthesizer ( dds ) used as a divider in phase lock loop ( pll ) , a frequency synthesizer with small frequency resolution ratio and high purity frequency spectrum can be realized
摘要通过对直接数字合成器在锁相环路中作为分频器应用的研究，使频率合成器可以在实现超细频率分辨率的同时达到高的频谱纯度。 |
| 4. | The phase noise in microwave receiver and the measured parameter of source frequency instability are described in this paper , and the technology of frequency - synthesizing and theory of phase locked loop ( pll ) are also briefly introduced
摘要阐述了微波接收机中的相位噪声概念及本振源频率不稳定度的实际测量参数，并简要介绍了频率合成技术和锁相环路工作原理。 |
| 5. | 3 . the methods to improve and enhance the performance parameters of frequency synthesizer , such as phase noise and frequency stability , are discussed detailly and deeply through the linear phase model of pll which is using to implement the
3 .利用锁相环路的线性相位模型,详细讨论了利用锁相环进行频率合成时,频率合成器的主要性能参数如相位噪声和频率稳定度的改进方法。 |
| 6. | Through the combination of inverter circuit and pll circuit , the process of frequency - tracking is described , and the experimental waves can be reflected perfectly . this provides some experience for the designing and debugging of electrical source
并将锁相环路与主电路结合起来，观察到频率跟踪的过程，很好的反映了实际波形，为今后该类电源装置的设计调试提供了良好的前期准备。 |
| 7. | We design the digital phase - locked loop applying the method designing digital circuitry from the top down . we design the circuitry by the vhdl in the maxpulsii software environment . we validate the circuitry function in the emulator
采用自顶向下的数字电路设计方法设计全数字锁相环路，在maxplusii设计环境下采用vhdl语言、 ahdl语言等设计实现数字锁相环，并通过计算机仿真证实其正确性。 |
| 8. | With the phase - noise model of the phase loked loop ( pll ) and the analysis of spur characteristic of fractional - n frequency synthesizer using - ? modulating technology , the scheme of pll with mixer + quadrupler is confirmed as a result
文中,通过建立锁相环路的相位噪声模型,并分析了使用- ?调制技术的分数频率综合器的杂散性能,以此二者为理论依据完成了毫米波频率源合成器的基本方案? ?锁相混频环+倍频器方案。 |
| 9. | The basic operation principle of phase - locked frequency synthesizer and the type of circuits are expatiated systematicly in this paper . the principle of operation on sampling phase detector and some characteristics including the linear tracking and phase noise in phase loop circuits are analyzed deeply . the research is emphased on the theory and design method of circuits in the sampling phase - locked frequency synthesizer . then , the expansion capturing circuit is analyzed and designed for better performance of capturing loop circuits . at last , the loop filter is also analyzed and contrived taking account of effection of additional phase shift by the sampling - holder . the general research on the theory and technology of sampling phase lock in the paper will make a basement for the development of new product
本文系统的阐述了锁相频率合成器的基本工作原理及电路类型；较深入地分析了取样鉴相工作原理及电路、锁相环路的线性跟踪特性和相位噪声特性；重点对取样锁相频率合成器电路理论和设计方法进行了研究；为了改善环路的捕获性能，对扩捕电路进行了分析和设计，并用wewb32软件对电路进行了仿真；考虑到取样保持器的附加相移影响，对环路滤波器进行了分析和设计。 |
| 10. | At last we introduce the realization of all the parts , the problem in the circuit design and the measured data . the results show that the designed system has met the requirement . in this dissertation , direct digital synthesis technology has been used in the phase - locked frequency synthesizer , which can make full use of the characteristics of direct digital synthesis technology such as flexible output wave shape and continuous
本课题将直接数字式合成技术用于锁相频率合成器中,该方法将直接数字合成的特点,如输出波形灵活且相位连续、频率稳定度高、输出频率分辨率高、频率转换速度快、输出相位噪声低、集成度高、功耗低、体积小等与锁相环路的频带宽、工作频率高、频谱质量好等优点有机的结合起来,从而在宽带的条件下实现了比较好的杂散性能和相噪。 |
