中国电子学会电子制造与封装技术分会会刊

中国半导体行业协会封测分会会刊

无锡市集成电路学会会刊

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电子与封装 ›› 2026, Vol. 26 ›› Issue (6): 060303 . doi: 10.16257/j.cnki.1681-1070.2026.0098

• 电路与系统 • 上一篇    下一篇

一种多比特量化的高精度Sigma-Delta DAC设计*

谭琦扬1,张瑛2杜建新1,裴春泽1   

  1. 1. 南京邮电大学电子与光学工程学院、柔性电子未来技术学院
  • 收稿日期:2025-11-14 出版日期:2026-07-02 发布日期:2026-03-17
  • 作者简介:谭琦扬(2000—),男,江苏镇江人,硕士研究生,主要研究方向为模拟集成电路设计。

Design of High-Precision Sigma-Delta DAC with Multi-Bit Quantization

TAN Qiyang1, ZHANG Ying2, DU Jianxin1, PEI Chunze1   

  1. 1. College of Electronic andOptical Engineering & College of Flexible Electronics Future Technology, NanjingUniversity of Posts and Telecommunications, Nanjing 210023, China; 2. School of Integrated Circuit Science andEngineering Industry-Education Integration School,Nanjing University of Posts and Telecommunications, Nanjing 210023, China
  • Received:2025-11-14 Online:2026-07-02 Published:2026-03-17

摘要: 设计了一种多比特量化的高精度Sigma-Delta DAC。采用3阶4位量化的级联谐振分布式反馈结构(CRFB)调制器,有效降低了模拟电路的设计难度,提升了系统性能;同时采用数据加权平均算法(DWA)电路对电容失配噪声进行整形,以提高整体性能;此外,通过改进开关电容DAC的电路结构并优化传递函数,降低了对运算放大器摆率和带宽的要求。整体电路基于0.15 μm BCD工艺实现,在采样频率为10.24 MHz时,后仿真结果显示输出信号噪声失真比(SNDR)为98.2 dB,总谐波失真(THD)为-102.3 dB,具备良好的动态特性。

关键词: Sigma-DeltaDAC, 开关电容DAC, 级联谐振分布式反馈, 数据加权平均算法

Abstract: A high-precision Sigma-Delta DAC with multi-bit quantization is designed. A 3rd-order 4-bit quantization cascaded resonant distributed feedback (CRFB) modulator is employed to effectively reduce analog circuit design complexity and enhance system performance. Concurrently, a data weighted averaging (DWA) circuit is utilized to shape capacitance mismatch noise, thereby improving overall performance. Furthermore, by refining the circuit structure of the switched-capacitor DAC and optimizing the transfer function, the requirements for the operational amplifier slew rate and bandwidth are reduced. The entire circuit is implemented using a 0.15 μm BCD process. At a sampling frequency of 10.24 MHz, the post-simulation signal-to-noise distortion ratio (SNDR) is 98.2 dB, and the total harmonic distortion (THD) is –102.3 dB, demonstrating excellent dynamic performance.

Key words: Sigma-Delta DAC, switched-capacitor DAC, cascaded resonant distributed feedback, data weighted averaging

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