一种基于SCL结构的高精度差分型PFD的设计  

A Differential-Type Phase Frequency Detector of High Precision Based on SCL Structure

作　　者：陈艳[1] 罗岚[1] 时龙兴[1] 

机构地区：[1]东南大学国家专用集成电路系统工程技术研究中心,江苏省南京市210096

出　　处：《电子工程师》2004年第3期29-32,共4页Electronic Engineer

摘　　要：介绍一种基于场效应管源级耦合逻辑 (SCL)结构的高精度差分型鉴频鉴相器 (PFD)的设计 ,包括构成PFD的SCL结构基本单元———SCL结构D触发器、与非门、倒相器和缓冲单元。仿真实验结果表明 ,该PFD不仅能够减小死区范围 ,提高鉴相精度到 5 0 ps,而且具有速度快、功耗低 (仅4 7mW )的特点 ,在低抖动锁相环路设计中有着广泛的应用。This paper presents a differentail-type phase frequency detector(PFD)of SCL structure. The SCL logic cells used in the differential-type PFD are described, including a SCL flip-flop,SCL NAND gates, SCL INV and SCL buffer. These PFD can greatly reduce the dead-zone phenomenon in phase characteristic, which is important in low-jitter applications.The dead-zone is 50 ps, and the detector has the feature of high precision and low power(47 mW). It can be used for design of low-jitter PLL applications.The PFD is simulated by Hspice with the 0.25 μs CMOS process.

关 键 词：PFD SCL 源级耦合逻辑 鉴频鉴相器 触发器 倒相器 

分 类 号：TN763[电子电信—电路与系统]