一种采用DEM技术的16-bit 2.5 GHz电流舵数模转换器设计  

A 16-bit 2.5 GHz Current-Steering DAC with DEM Technique

作　　者：吴俊杰 吴建辉[1] 智贺 WU Junjie;WU Jianhui;ZHI He(National Engineering Research Center for ASIC System,Southeast University,Nanjing Jiangsu 210096,China)

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,江苏南京210096

出　　处：《电子器件》2023年第3期624-629,共6页Chinese Journal of Electron Devices

摘　　要：电流舵数模转换器(DAC)的动态性能受电流源失配的影响。采用6+10的分段方式,分析比较了几种动态元件匹配(DEM)算法,采用了一种分段温度数据权重平均(Segmented Thermo Data-Weighted Average, STDWA)技术,并将其应用于高6位的温度计编码中,消除对输入编码的依赖,弱化电流源失配的影响,以优化动态性能。基于TSMC 55 nm工艺,设计实现了一种16位2.5 GHz的电流舵DAC,测试结果显示,在2.5 GHz采样率和94.15 MHz输入信号频率条件下,无杂散动态范围(SFDR)提升了6 dB。For current-steering digital-to-analog converters(DACs),the dynamic performance is influenced by the mismatch of current sources. 6+10 segments mode is used, several dynamic element matching(DEM)algorithms are compared, and a Segmented Thermo Data-Weighted Average(STDWA)technique is presented, which is applied in the high 6 bit thermometer code to eliminate the signal code dependent, weaken the effect of current source mismatch, and optimize the dynamic performance. The 16-bit 2.5 GHz current-steering DAC has been implemented in TSMC 55 nm process, the test results show that the SFDR is improved by 6 dB at 2.5 GHz sample frequency and 94.15 MHz input signal frequency.

关 键 词：数模转换器(DAC) 电流舵 分段译码 动态元件匹配(DEM) 无杂散动态范围(SFDR) 

分 类 号：TN792[电子电信—电路与系统]