一种12位电压与电流组合型DAC设计  

Design of 12-bit Voltage and Current Combined DAC

作　　者：桂伯正 黄嵩人 GUI Bozheng;HUANG Songren(School of Physics and Optoelectronic Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105

出　　处：《电子与封装》2025年第2期39-43,共5页Electronics & Packaging

摘　　要：采用40 nm CMOS工艺设计了一款12位200 ksample/s低功耗数模转换器(DAC)芯片。结合建立速度和静态性能的设计指标,设计了“7+5”分段式电压与电流组合型结构和AB类输出缓冲器,在保证建立速度的条件下考虑到电阻的失配性,实现了良好的微分非线性(DNL)和积分非线性(INL)特性。测试结果表明,在-40~125℃下,DNL<0.2 LSB,INL<2 LSB,DAC具有精度高、单调性好、负载能力强的特点。A 12-bit 200 ksample/s low-power digital-to-analog converter(DAC)chip is designed using 40 nm CMOS process.Combining the design indicators of establishment speed and static performance,a"7+5"segmented voltage-current combination structure and a class-AB output buffer are designed.Considering the resistance mismatch while ensuring the establishment speed,good differential nonlinearity(DNL)and integral nonlinearity(INL)characteristics are achieved.The test results show that from-40℃to 125℃,DNL is less than 0.2 LSB and INL is less than 2 LSB.The proposed DAC has the characteristics of high accuracy,good monotonicity and strong load capability.

关 键 词：数模转换器 微分非线性 积分非线性 AB类输出缓冲器 

分 类 号：TN402[电子电信—微电子学与固体电子学]