一种高精度音频Sigma-Delta DAC的设计  

Design of a high-precision audio Sigma Delta DAC

作　　者：郑晓燕 陈群超[1] ZHENG Xiao-yan;CHEN Qun-chao(College of Physics and Information Engineering,Fuzhou University)

机构地区：[1]福州大学物理与信息工程学院

出　　处：《中国集成电路》2024年第1期76-81,共6页China lntegrated Circuit

摘　　要：设计了一种应用于音频Codec的高精度Sigma-Delta DAC,针对数字插值滤波器占用面积大的问题,提出了乘法器复用的方法,减少数字电路的硬件消耗。为解决Sigma-Delta调制器多比特量化引起的非线性问题,引入DWA(Data Weight Average)算法,提高系统的精度。此外,DCT(Direct Charge Transfer)电路用于实现数字域到模拟域的高精度转换。电路采用0.18μm CMOS工艺,整体DAC的信噪比为105.7dB@1150Hz,有效位数达到17.26bit。A high-precision Sigma Delta DAC for audio Codec has been designed.To address the issue of large area occupied by digital interpolation filters,a multiplier multiplexing method has been proposed to reduce hardware consumption in digital circuits.To solve the nonlinear problem caused by multi bit quantization in Sigma Delta modu-lators,the DWA(Data Weight Average)algorithm is introduced to improve the accuracy of the system.In addition,DCT(Direct Charge Transfer)circuits are used to achieve high-precision conversion from digital domain to analog domain.The circuit adopts 0.18μm CMOS process,and the overall signal-to-noise ratio of the DAC is [e-mail] effective number of bits reaches 17.26 bit.

关 键 词：插值滤波器 乘法器 SIGMA-DELTA调制器 DCT电路 

分 类 号：TN792[电子电信—电路与系统]