摘要
针对动态电压/频率调整系统芯片中时钟同步问题,设计一个具有宽工作频率范围和固定锁定周期的快速锁定全数字逐次逼近延时锁定环,采用改进的可复位数字控制延时线方法,在减小面积和提高最高工作频率的同时,有效地解决传统全数字逐次逼近延时锁定环的谐波锁定和零延时陷阱问题。整个延时锁定环采用TSMC-65 nm CM OS工艺标准单元库实现,仿真结果表明,在典型工艺角和25℃情况下,工作频率范围为250 M Hz^2 GHz,锁定时间为固定的18个输入时钟周期,当电源电压为1.2 V、输入时钟频率为2 GHz时,功耗为0.4 m W。
An all digital fast-locking Successive Approximation Register-controlled Delay-Locked Loop( SARDLL) with w ide-range operating frequency and constant acquisition cycles is presented for the clock synchronization of Dynamic Voltage / Frequency Scaling( DVFS) System-on-Chip( So C). The improved resettable Digitally Controlled Delay Line( DCDL) scheme is adopted to effectively solve the harmonic lock problem and zero-delay problem of the conventional all digital SARDLL,meanw hile reduces the hardw are overhead and increases the maximum operating frequency. The presented all digital SARDLL is implemented using the TSM C-65 nm CM OS standard cell library. Based on the typical corner and25℃,the post-layout simulation results show that the operating frequency range is from 250 M Hz to 2 GHz,the lock time is18 cycles of the input clock signal and the pow er consumption is 0. 4 m W at 2 GHz and 1. 2 V supply voltage.
出处
《计算机工程》
CAS
CSCD
北大核心
2015年第4期273-276,283,共5页
Computer Engineering
基金
安徽省教育厅自然科学研究基金资助重点项目(KJ2014A211)
合肥学院重点建设学科基金资助项目(2014xk06)
关键词
动态电压/频率调整
延时锁定环
时钟偏差
片上系统
锁定时间
谐波锁定
零延时陷阱
Dynamic Voltage/Frequency Scaling(DVFS)
Delay-Locked Loop(DLL)
clock skew
System-on-Chip(So C)
lock time
harmonic lock
zero-delay trap