应用于电流型数模转换器的积分非线性误差优化方法  

A Linear Optimization Method for Integral Non-Linearity Error and Its Application to Current-Mode Digital-to-Analog Converter

作　　者：傅文渊[1,2] 凌朝东[1,2] 

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021 [2]厦门市专用集成电路系统重点实验室,福建厦门361008

出　　处：《华侨大学学报（自然科学版）》2012年第2期163-167,共5页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(60772164);福建省自然科学基金资助项目(T0850005)

摘　　要：提出一种新型积分非线性优化方法,即在电流源上分别并联两组控制信号与原电流源的控制信号相反的辅助伪差分共源共栅MOS管,其电流源产生一个与原共源共栅电流源相反的积分非线性偏差,极大减小数模转换器的积分非线性和开关毛刺现象.仿真结果表明,优化后的积分非线性减少96%,数模转化器的有效转换位数增加了2.1bit,无杂散动态谐波范围增加了15dB;未优化前的积分非线性设计与Monte Carlo仿真结果有500%的偏差,而优化后的偏差仅为60%.A novel integral nonlinear optimization method which is that added respectively in parallel two sets of auxiliary pseudo-differential cascode MOS transistor to the current source is presented. Auxiliary pseudo-differential cascode cur- rent source generates a negative signal with the original source of the opposite current integral nonlinearity error, which greatly reduce the digital-to-analog converter＇s integral nonlinearity （INL） and ,switching glitches phenomenon. Simula- tion results show that INL decrease 96%, and effective number of bits （ENOB） increase 2.1 bit, and spurious free dy- namic range （SFDR） increase 15 dB. Integral nonlinearity deviation is 500% compared to the results of the Monte Carlo simulation before the optimized, and it is reduced to 60% after the optimized design.

关 键 词：数模转换器 电流型 积分非线性 电流源 

分 类 号：TN792[电子电信—电路与系统]