应用于电流型数模转换器的积分非线性误差优化方法-《华侨大学学报（自然科学版）》

文章信息/Info

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

Author(s):: FU Wen-yuan¹; 2; LING Chao-dong¹; 2; 1.College of Information Science and Engineering, Huaqiao University, Quanzhou 362021, China; 2.Key Laboratory of ASIC System, Xiamen 361008, China

Keywords:: digital-to-analog converter; current mode; integral nonlinearity; current source

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%.

Abstract:: 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 current 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.Simulation results show that INL decrease 96%,and effective number of bits(ENOB) increase 2.1 bit,and spurious free dynamic 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.