电子学报 ›› 2018, Vol. 46 ›› Issue (5): 1240-1245.DOI: 10.3969/j.issn.0372-2112.2018.05.033

• 科研通信 • 上一篇    下一篇

一种3阶Mash结构的Σ-Δ音频数模转换器

来新泉, 陈勇, 叶强, 龙燕   

  1. 西安电子科技大学电路CAD研究所, 陕西西安 710071
  • 收稿日期:2017-06-26 修回日期:2018-02-05 出版日期:2018-05-25
    • 通讯作者:
    • 陈勇
    • 作者简介:
    • 来新泉 男,1963年生于陕西蒲城.现为西安电子科技大学电路CAD所教授、博士生导师.主要研究方向电子系统集成与数模混合专用集成电路设计.Email:xqlai@mail.xidian.edu.com.cn
    • 基金资助:
    • 国家自然科学基金 (No.61771363)

A Σ-Δ Audio DAC Converter Based on 3-Order Mash Structure

LAI Xin-quan, CHEN Yong, YE Qiang, LONG Yan   

  1. Institute of Electronic CAD, Xidian University, Xi'an, Shaanxi 710071, China
  • Received:2017-06-26 Revised:2018-02-05 Online:2018-05-25 Published:2018-05-25
    • Supported by:
    • National Natural Science Foundation of China (No.61771363)

摘要: 针对传统的Mash结构由于各级失配导致信噪比低的问题,本文采用一阶相位累加器来实现传统的sigma-delta(Σ-Δ)架构,并将其采用硬件描述语言来实现,这样整个系统均在数字域实现,从根本上解决了各级间的失配问题.在插值滤波器的设计上,使用优化了的半带滤波器结构和级联积分梳状滤波器,节省了硬件资源.电路采用的是Magnachip 180nm 1P4M标准CMOS工艺,芯片面积只有0.2025mm2(0.45×0.45),实测芯片得到的信噪失真比(SNDR)达到90dB.

关键词: 音频数模转换器, Mash Σ-Δ调制器, 插值滤波器

Abstract: To solve the problem that the traditional Mash structure has low signal-to-noise ratio because of mismatch at each levels,in this paper,the traditional sigma-delta (Σ-Δ) structure is realized by using the phase accumulator,which is easy to realize the hardware description language of the whole system,thus fundamentally solving the mismatch between the different stages.In the design of the interpolation filter,the use of optimized half-band filter structure and cascaded integral comb filter,saving hardware resources.The circuit uses the Magnachip 180nm 1P4M standard CMOS process,the chip area is only 0.2025mm2 (0.45×0.45),the measured chip signal to Noise and Distortion Ratio(SNDR) to 90dB.

Key words: audio DAC, mash sigma-delta, interpolator filter

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