摘要
在分析电荷泵锁相环基本原理的基础上,给出了三级电荷泵锁相环的线性相位模型以及三级电荷泵锁相环的开环和闭环传输函数,结合具体的设计实例利用三级电荷泵锁相环的环路传输函数在MATLAB中对该锁相环进行了系统级设计,最后在SIMULINK中建立了该三级电荷泵锁相环的行为模型,分析系统的建立时间和频率响应等特性。该模型不但可以快速评估环路参数变化对CPPLL瞬态特性的影响,而且可以在模型中引入适当的噪声源,并分析其对输出相位噪声的影响。仿真结果符合设计要求,这种方法同样适合高阶电荷泵锁相环的设计和分析。
Based on the analysis of the basic principles of charge pump phase-locked loop, this paper gives the linear phase model and the open and close loop transfer functions of three order charge pump phase locked loop （CPPLL）; and combining with a specific example carries out the system design of that locked loop using the loop transfer function of three order CPPLL in MATLAB; finally, establishes a behavioral model of the three order CPPLL in SIMULINK; and analyses the systems＇ characteristics such as settling time, frequency response, and so on. The model not only can quickly assess the impact of loop parameter variation on the transient performance of CPPLL, but also can introduce appropriate noise source into the model and analyze its impact on the output phase noise. The simulation results meet the design requirements; this method is also suitable for the design and analysis of higher order charge-pump phase-locked loop.
出处
《电子技术（上海）》
2011年第2期35-36,31,共3页
Electronic Technology
基金
安徽省教育厅重点科研项目(KJ2010A022)
