25GHz全速率时钟数据恢复电路的设计.docx

优秀毕业论文 精品参考文献资料 Classified Index: TN432 U.D.C: 621.3 Dissertation for the Master Degree in Engineering DESIGN OF 2.5GHz FULL SPEED CLOCK AND DATA RECOVERY CIRCUIT Candidate: Supervisor: Academic Degree Applied for: Specialty: Affiliation： Date of Defense: Degree-Conferring-Institution: 硕士学位论文 硕士学位论文 - - I - 摘 要 过去二十年来，电话、传真、电视和数据等信号传递的爆炸性需求推动 了光纤通信的迅速发展，光纤通信以及与之相关的技术和工艺取得了革命性 的进步，美国同步光网络（SONET）和国际同步数字体系（SDH）标准的建 立为光纤通信系统的大规模研制和应用开辟的前进的道路。现在，2.5Gbps 高速光纤通信系统已经在世界范围内进入大规模建设阶段，更高速率的系统 的研制和应用也在开展之中。 时钟数据恢复电路（CDR）正是光纤通信以及很多其他高速串行数据通 信系统中不可缺少的关键电路，也是系统向更高速率提升的主要瓶颈。同时， CDR 电路还要满足一系列苛刻的国际复用标准。 本文介绍了一种使用 0.18μm CMOS 工艺实现的，用于 SDH 系统 STM-16 （2.5Gbps）标准的时钟数据恢复电路。首先介绍了光纤通信系统的基本概念 以及常见的时钟数据恢复电路的结构和基本原理，然后介绍了一个带鉴频器 （FD）辅助频率捕获的双环路锁相环时钟数据恢复电路的设计与仿真。 从仿真结果来看，本设计电路可以稳定工作在 2.5Gbps 的速率下，并符 合 ITU-T 国际标准中对 STM-16 级别的相关要求。 关键词 光纤通信；时钟数据恢复（CDR）；锁相环（PLL）；互补金属氧化 物半导体（CMOS）；抖动（Jitter） - - II - Abstract In the past twenty years, the great demand of transmission of telephone, fax, television and data led to a rapid development of optical communication, optical communication and its technology achieved great progress. The recommendation from SONET and SDH standardized and accelerated the researches and applications of optical communication system. Nowadays, STM-16(2.5Gb/s) has began to construct extensively, and higher-speed system is being studied. The clock and data recovery(CDR) circuit is a key component in the optical communication system as well as many other high-speed serial data communication systems, and is the main bottleneck of systems’ upgrading to higher speed. The CDR circuit is asked to meet a series of hard and fast standard given by the Synchronous Digital Hierarchy(SDH), which they called recommendation. This paper introduces a clock and data recovery circuit, which is realized in the standard 0.18μm CMOS technology, is used to work under the series STM-16(2.5Gbps) of SDH system. Above all, this paper introduces the basic conceptions of optical communication system, the funda