2.4GHz双路锁相环频率综合器的研究与设计

发布时间：2018-08-18 20:42

【摘要】：基于锁相环(Phase-Locked Loop)的频率综合(Frequency Synthesis)技术是无线通信系统中的基本技术。频率综合模块作为本机振荡器产生精确的振荡信号,其性能对接收机起决定性作用。本文完成了一个工作在2.4GHz频段的基于PLL的频率综合器的研究与设计。首先对PLL频率综合器的背景知识做了简单介绍,说明了其主要用途。并简述了PLL频率综合器的发展历程、研究现状进行了简单的介绍。然后,介绍锁相环系统结构的基础,以及其中各个模块的作用和数学模型。在此基础上引入了基于锁相环的频率综合器,简要说明其以分频比为依据的分类。并介绍了关于相位噪声的基本概念。分模块对PLL频率综合器进行讨论,分别是鉴相鉴频器、电荷泵、压控振荡器和分频器。给出了本文所采用的各模块在环路内性能的优点,着重强调文章标题中提到的双环路滤波器结构的采用。最后,在仿真验证方面,采用tsmc0.18um混合信号射频工艺进行电路设计,并使用Cadence IC5141软件对电路进行仿真验证,采取1.8V单电压源。其中VCO模块采用pss+pnoise和tran分析,并给出其噪声等性能参数。对PFD给出逻辑仿真验证结果,对CP给出直流特性。最后给出整个系统频率综合的仿真结果。
[Abstract]:Frequency synthesis (Frequency Synthesis) technology based on phase locked loop (Phase-Locked Loop) is the basic technology in wireless communication system. As a local oscillator, the frequency synthesis module produces accurate oscillation signal, and its performance plays a decisive role in the receiver. In this paper, the research and design of a PLL based frequency synthesizer working in 2.4GHz band is completed. Firstly, the background knowledge of PLL frequency synthesizer is briefly introduced, and its main application is explained. The development of PLL frequency synthesizer is introduced briefly. Then, the basic structure of PLL system, the function and mathematical model of each module are introduced. Based on this, a frequency synthesizer based on PLL is introduced. The basic concept of phase noise is introduced. The PLL frequency synthesizer is discussed in sub-modules, which are phase discriminator, charge pump, voltage-controlled oscillator and divider. The advantages of the performance of each module in the loop are given, and the adoption of the dual-loop filter structure mentioned in the title of the paper is emphasized. Finally, in the aspect of simulation and verification, the circuit is designed by using tsmc0.18um mixed signal RF process, and the circuit is simulated by Cadence IC5141 software. The single voltage source of 1.8V is adopted. The VCO module is analyzed by pss pnoise and tran, and its performance parameters such as noise are given. The logic simulation results of PFD and the DC characteristics of CP are given. Finally, the simulation results of frequency synthesis of the whole system are given.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN713;TN911.8

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