一种新型高精度低功耗守时芯片  

A novel high-precision,low-power time-keeping chip

作　　者：陈亮[1] 咸德勇[2] 刘思慧[1,3] 田丰[1] 欧钢[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073 [2]北京环球信息应用开发中心,北京100094 [3]北京跟踪与通信技术研究所,北京100094

出　　处：《国防科技大学学报》2013年第3期176-180,共5页Journal of National University of Defense Technology

摘　　要：以测时测距体制为基础的定位系统中,提高时间精确度是改善导航接收机性能的一个关键因素。然而,在便携或手持式导航设备中,现有的守时芯片难以在低功耗的条件下实现高计时精度。针对上述矛盾,本文提出了一种全新的守时芯片电路结构,通过直接温度补偿计时,以及低功耗连续工作和高功耗间歇突发工作相结合,实现了优于0.5ppm级别的守时精度和低于200μW待机功耗,可替换传统音叉型RTC芯片,提高便携或手持式导航设备性能。In a positioning system based on calculating the distance by measuring the time delay,increasing the accuracy of the estimation of time delay is a key factor to improve the performance of navigation receivers.Generally,the off-the-shelf timekeeping chip cannot achieve the performance of high accuracy and low power consumption at the same time,which is especially required in portable and hand-held navigation receivers.A novel architecture of the timekeeping chip was presented to solve that contradiction.In this architecture,the time is compensated directly according to the temperature.And two circuit operation states,the low-power operation and the high-power bursty process,work alternately in turn.The chip can achieve the time accuracy of 0.5ppm and the stand-by power consumption of 173μW,which can replace state-of-art commercial RTCs to improve the performance of portable and hand-held navigation receivers.

关 键 词：导航接收机 守时芯片 高精度 低功耗 待机模式 

分 类 号：TN751[电子电信—电路与系统]