Then some theory formulas have been inducted . these discussions and formulas are necessary in the subsequent sections . the third chapter is a section of system design and test data 并以这些模型为基础,推导了一些决定其相位噪声的理论公式,为后叙实际系统的实现做了一些必要的理论陈述。
Some hybrid frequency synthesis methods for dds + pll which used usually are presented in the following section , and its analysis for phase noise , spur , and frequency jump speed was also introduced 接着对dds + pll频率合成器常用组合方案进行了介绍,并对dds + pll系统的相位噪声、杂散、频率转换速度进行了分析。
The second chapter is a section of device phase noise analysis , many useful devices such as multipliers , amplifiers , mixers , oscillators and pll ( phase locked loop ) have been discussed 第二章的器件相位噪声的理论分析部分,主要论述了常用微波器件的相位噪声模型,比如倍频器,放大器,混频器,振荡器及锁相环。
With linear time - invariant modeling of phase noise and definition of “ effective resistor ” , we analyze the critical parameters of the circuit and calculate the value of phase noise at the 1 / f ~ 2 region 引入“有效电阻”的概念对电路的各项关键参数在线性时不变模型下进行理论分析和推导,得到相位噪声在1f2区域的理论值。
Finally , the x - band low phase - noise single output frequency synthesizer is designed and tested , and the measured results show that , this frequency synthesizer can satisfy the requirements of the system scheme 最后,研制成功了x波段低相位噪声点频源,实测结果表明其指标满足毫米波频率源合成器的基本方案对该功能组件的要求。
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。
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。
With cad technology the high reliable constant temperature crystal oscillator is emulated , then its phase noise property is optimized , which is an guide to the cad of the low phase noise crystal oscillator hi the future 利用计算机辅助设计技术对高稳定恒温晶体振荡器进行仿真，优化其相位噪声特性，对今后低相噪晶体振荡器的计算机辅助设计具有重要的指导作用。
According to leeson model , which had proposed the relationship of noise between output and input in the feed - back oscillator , an experimental crystal oscillator circuit with high stability and low phase noise is designed 参照提出反馈振荡器中输出和输入噪声关系的李森模型,设计一高稳定低相位噪声振荡器的实验电路,并在实验中分析电路关键元件对电路整体性能的影响。
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。
