提高低功耗电流源阵列中电流匹配精度的研究  

Study on Improvement of Current Matching for Low-Power Current Source Array

作　　者：汤英 袁方[1] 伍冬[1] 沈延钊[1] 许军[1] 

机构地区：[1]清华大学微电子与纳电子学系,北京100084

出　　处：《微电子学》2011年第6期820-823,829,共5页Microelectronics

摘　　要：针对低功耗阵列中电流型D/A转换器的电流匹配精度进行研究。通过模拟校准技术和高精度RGC电流镜的使用,减小了阵列中工艺参数、温度、电学特性等因素的差异对电流匹配精度的影响。在Chartered 0.35μm工艺下,利用Hspice进行仿真。结果表明,在10nA到1μA电流范围内,系统匹配精度大于96.5%,静态功耗低于213μW,有效提高了电流的匹配精度。The accuracy of current matching for current-mode D/A converter in low-power current source array was studied.By using analog calibration technology and high-precision RGC current mirror,effects of different process parameters,temperature and electrical properties in the array on the accuracy of current matching was reduced.Simulation was made with Hspice based on Chartered 0.35 μm process.Results showed that,in the current range from 10 nA to 1 μA,the system had a matching accuracy greater than 96.5% and a static power consumption less than 213 μW,effectively improving the accuracy of current matching.

关 键 词：D/A转换器 电流源阵列 自校准 电流镜 

分 类 号：TN792[电子电信—电路与系统]