补偿D/A译码器中梯度误差的新算法  

New Switching Sequence for Gradient Error Compensation in Thermometer-Decoded DAC Arrays

作　　者：王晓峰[1] 杨柯[1] 凌燮亭[1] 胡波[1] 

机构地区：[1]复旦大学电子工程系,上海200433

出　　处：《Journal of Semiconductors》2004年第1期93-98,共6页半导体学报（英文版）

摘　　要：对数模转换器 (DAC)中温度译码转换矩阵的开关选取顺序进行了研究 .在 SG(sort and group)算法基础上 ,提出了一种新的补偿 DAC转化矩阵中梯度误差 (gradient error)的开关选取算法 .新的开关选取算法不仅使 DAC中由梯度误差造成的 INL (integral non- linearity)噪声幅值得到最优的衰减 ,而且在小幅值信号转化时大幅度减小了非线性噪声的能量 ,提高了小信号输入时输出信号的信噪比 (SNR,signal- to- noise ratio)Switching schemes for gradient error compensation in unary (thermometer-decoded) arrays of digital-to-analog converters (DAC's) are discussed.A new optimizing switching sequence is presented,which can compensate the gradient error of DAC's converting arrays.With the new method,it can not only get the optimized bound of integral nonlinearity (INL) causing by DAC's gradient error,but also substantially reduce the nonlinear noise energy during the small signal converting so as to improve the signal-to-noise ratio (SNR) of the output signal.

关 键 词：数/模转换器 梯度误差 开关序列 温度译码 

分 类 号：TN76[电子电信—电路与系统]