本文的目的是研究目前应用最广的电荷泵锁相环的噪声特性以寻找减小环路噪声的电路架构。
The objective of the thesis is to explore the noise sources in PLL and find the proper circuit structures to reduce the noise effects.
许多已有的CO(中心局)dsl调制解调器可以只支持相对较窄的接收频率范围，这会增加估计宽的多的远端环路噪声的难度。
Many existing CO DSL modems may only support a relatively narrow receive frequency range, which will increase the difficulty of estimating the much wider bandwidth far-end loop noise.
并以相位跟踪环路为例分析了热噪声及载体动态性对环路的影响，得出了环路设计的最佳带宽。
The effect of thermal noise and vehicle dynamics on carrier tracking loop are also analyzed, and the optimal bandwidth of carrier tracking loop is obtained.
文中还讨论了在噪声作用下采用这种环路的可能性和滤波器的设计问题。
The possibility of using this kind of phase-locked loop under noise interference and the problems of filter design are discussed.
所以环路滤波器的噪声分析非常重要。
通过在传递函数中引入两个极点，获得了比多环路级联结构更好的系统噪声性能。
By adding two poles into the transfer function, better noise performances compared with that of the MASH structure are achieved.
本文先介绍了锁相环的工作原理，环路滤波器的设计并对相位噪声的理论进行了阐述。
In this article, PLL theory, design of loop filter and phase noise theory are introduced at first.
利用非线性环路模型对环路的噪声性能和捕捉过程进行了定量分析，仿真结果与实测数据吻合得较好。
Based on nonlinear loop models, quantitative analysis on noise performance and capture procedure of the DPLL is performed. The simulation results are in good accordance with the experimental data.
该分析以非对称数字环路传输系统为例，其噪声在DC附近集中。
The asymmetry digital circuit transmission system was taken as example. The noise was gathered around DC.
另一个因素可能是高q值作为我的环路滤波器的更多的宽带噪声。
Another factor could be the high Q of my loop acting as a filter for more broad band noise.
并采用新的相位估计方式估计含相位噪声的载波相位，提升了该条件下的环路信噪比。
With improved phase estimation method, a carrier signal phase with phase noise can be estimated, while loop SNR also increases.
提出了一种通过放大器和开关建立起反馈环路，基于列级反馈复位的低噪声CMOS图像传感器(CIS)。
A low reset noise CMOS image sensor (CIS) based on column-level feedback reset is proposed. A feedback loop was formed through an amplifier and a switch.
利用计算机仿真方法详细分析不同噪声环境下，载波频差对码跟踪环路输出、码相位差对载波跟踪环路等因素的影响；
Then the influence of carrier frequency error on code loop and influence of code phase error on carrier loop in different noise are discussed in simulation.
环路滤波器中的有源和无源器件均有噪声产生，此类噪声会叠加在输出信号上，从而恶化输出信号的相位噪声。
Noise which comes from both active and passive circuit element in loop filter will deteriorate phase noise of output signal.
一种双环路频率综合器及其相位噪声分析方法。
The invention relates to a double-loop frequency synthesizer and a phase noise analyzing method.
一种双环路频率综合器及其相位噪声分析方法。
The invention relates to a double-loop frequency synthesizer and a phase noise analyzing method.
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