一种增/减量可变的计数式数控振荡器的设计  

Design of an Increment/Decrement Adjustable Digital Control Oscillator

作　　者：周书伟[1] 王云峰[1] 李晓潮[1] 郭东辉[1] 

机构地区：[1]厦门大学,福建厦门361005

出　　处：《现代电子技术》2007年第18期1-4,共4页Modern Electronics Technique

基　　金：福建省自然科学基金计划资助项目(A410007)

摘　　要：数控振荡器是全数字锁相环中的关键部件,目前应用较多的是除N计数式数控振荡器和增量/减量计数式数控振荡器,应用于锁相环时,前者做一次分频比调整就能使环路进入锁定状态,捕捉时间短,后者捕捉时间长,却有着前者没有的优势:结构简单、易于集成。提出了一种增/减量可变的计数式数控振荡器电路,此电路结构简单,同时也具有捕捉时间短的优点。DCO is a key module of DPLL, generally there are two design methods： N devided counter control and increment/decrement counter control. For the former,one frequency adjustment can make the loop reach the locked state, having a short capture time. The latter＇s capture time is much longer, but its structure is simple and easy for integration. In view of the above problem, this paper presents an increment/decrement adjustable DCO based on increment/decrement counter control principle. It adopts output feedback design and has a simple structure. It can gain the same capture speed of N devided counter DCO. The simulation results show that the DCO can change frequency in a large range rapidly.

关 键 词：全数字锁相环 数控振荡器 可编程计数器 边沿感应器 

分 类 号：TN742[电子电信—电路与系统]