中国半导体行业协会封装分会会刊

中国电子学会电子制造与封装技术分会会刊

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电子与封装 ›› 2025, Vol. 25 ›› Issue (6): 060302 . doi: 10.16257/j.cnki.1681-1070.2025.0057

• 电路与系统 • 上一篇    下一篇

一种高精度离散时间Sigma-Delta调制器的设计

郭林1,万江华1,2邓欢2   

  1. 1. 湘潭大学物理与光电工程学院,湖南 湘潭 411100;2. 湖南毂梁微电子有限公司,长沙 410000
  • 收稿日期:2024-11-07 出版日期:2025-06-27 发布日期:2025-01-20
  • 作者简介:郭林(1998—),男,江西赣州人,硕士研究生,主要研究方向为模拟集成电路设计。

Design of a High-Precision Discrete-Time Sigma-Delta Modulator

GUO Lin1, WAN Jianghua1,2, DENG Huan2   

  1. 1. School of Physics and Optoelectronics, Xiangtan University, Xiangtan411100, China;
  • Received:2024-11-07 Online:2025-06-27 Published:2025-01-20

摘要: 阐述了一种3阶3位量化离散时间Sigma-Delta调制器的设计。考虑到节约功耗和面积,调制器结构选择级联积分前馈(CIFF)结构。调制器的3位量化由7个多位比较器实现,为实现高精度,使用gain-boosting技术来提高积分器中运放的增益;同时使用数据加权平均(DWA)电路对输入端数模转换器(DAC)电容失配引入的噪声进行整形进而提高有效位数。调制器采用55 nm CMOS工艺设计,在电源电压为3.3 V、温度为27 ℃、典型tt工艺角下,带宽为16 kHz,有效位数为19.10位。

关键词: Sigma-Delta调制器, 级联积分前馈, gain-boosting技术, 数据加权平均

Abstract: The design of a third-order three-bit quantized discrete-time Sigma-Delta modulator is described. Considering power consumption and area saving, the cascaded integral feedforward (CIFF) structure is chosen for the modulator structure. The three-bit quantization of the modulator is realized by seven multi-bit comparators. In order to achieve high accuracy, the gain-boosting technique is used to increase the gain of the operational amplifier in the integrator. At the same time, a data-weighted averaging (DWA) circuit is used to shape the noise introduced by the mismatch of the digital-to-analog converter (DAC) capacitors at the input to increase the effective number of bits. The modulator is designed using 55 nm CMOS process, with a bandwidth of 16 kHz and an effective bit count of 19.10 bits at a supply voltage of 3.3 V, a temperature of 27 ℃, and a typical tt process corner.

Key words: Sigma-Delta modulator, cascaded integral feedforward, gain-boosting technique, data-weighted averaging

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