Design of Sigma Delta ADC for angle sensor

ZHOU Zhi-xing; LAI Qiang-tao; JIANG Yu; GUO Jiang-fei; WANG Cheng-long; CHEN Ten; GUO Gui-liang

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Design of Sigma Delta ADC for angle sensor

更新时间：2026-09-04

- Design of Sigma Delta ADC for angle sensor
- Vol. 36, Issue 8, Pages: 25-29(2019)
- 作者机构：
  
  1. 中国科学院机构微电子研究所,北京,100029
  2. 中国科学院大学机构,北京,101408
  3. 中国科学院大学微电子学院,北京,100029
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2019
- 稿件说明：
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周志兴, 来强涛, 姜宇, 郭江飞, 王成龙, 陈腾, 郭桂良. 一种应用于角度传感器的Sigma Delta ADC设计[J]. 微电子学与计算机, 2019, 36(8): 25-29.

ZHOU Zhi-xing, LAI Qiang-tao, JIANG Yu, et al. Design of Sigma Delta ADC for angle sensor[J]. 2019, 36(8): 25-29.
周志兴, 来强涛, 姜宇, 郭江飞, 王成龙, 陈腾, 郭桂良. 一种应用于角度传感器的Sigma Delta ADC设计[J]. 微电子学与计算机, 2019, 36(8): 25-29. DOI：

ZHOU Zhi-xing, LAI Qiang-tao, JIANG Yu, et al. Design of Sigma Delta ADC for angle sensor[J]. 2019, 36(8): 25-29. DOI：

摘要

采用XH018 0.35 μm CMOS工艺设计了一种应用于磁阻角度传感器的Sigma Delta调制器.由于实际运放的增益都是有限的

使得开关电容积分器的信号传输函数的极点发生偏移

进而影响ADC精度

本文采用有限增益补偿技术减小运放增益对开关电容积分器的影响.该调制器采用两阶1 bit全反馈结构

信号带宽12 KHz

采样频率6.25 MHz.后仿结果表明

在2.5 V电源电压下

调制器的整体功耗为4 mW.核心电路版图尺寸为0.45 mm×0.3 mm.在-40℃~150℃

各个工艺角的ENOB ≥ 16.5 bit.FOM=165.

Abstract

A Sigma-Delta modulator for magnetoresistive angle sensor is designed using XH018 0.35 μm CMOS process. The finite gain of the actual amplifier results in a pole shift in the transfer function

which will affect the accuracy of ADC. In this paper

the finite gain compensation technique is adopted to reduce the effect of operational amplifier gain on switched capacitor integrator. The structure of the modulator is 2 Order 1 Bit full feedback

with a signal bandwidth of 12 KHz and a sampling frequency of 6.25 MHz. The simulation results show that the overall power consumption of the modulator is 4mW under the 2.5V supply voltage. The layout of the core circuit is 0.45 mm×0.3 mm. At -40℃~150℃

the ENOB of each corner is greater than 16.5bit. FOM=165.

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references

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Franco Maloberti.数据转换器[M].西安:西安交通大学出版社, 2013.

RICHARD SCHREIER, JOSé SILVA, JESPER S. Design-Oriented Estimation of Thermal Noise in Switched-Capacitor Circuits[J]. IEEE Transaction on Circuits and System, 2005, 52(11):2358- 2368. DOI: 2358

Hoboken JOSE M. DELO ROSA. CMOS Sigma-Delta Converters Practical Design Guid[M]. Hoboken: John Wiley % Sons, 2013.

Hoboken RICHARD SCHREIER. Understanding Delta-Sigma Data Converters[M]. Hoboken: John Wiley % Sons, 2005.

景新幸, 包远鑫, 胡胜.一种低功耗16 bit音频Sigma Delta调制器的设计[J].微电子学与计算机, 2013, 33(9):115-118. DOI: 115

李亮, 陈珍海.应用于数字音频的二阶Sigma-Delta调制器设计[J].微电子学与计算机, 2010, 27(7): 198-201. DOI: 198

袁云, 李福杰, 赵野, 等.一种可集成于电池组检测芯片的Sigma-Delta A/D转换器[J].微电子学与计算机, 2014, 31(11): 143-147. DOI: 143

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