A Successive Approximation ADC Design for Implantable Intraocular Pressure Detection Application

MA Zhi-feng; LI Xi-ze; ZHANG Feng; CHEN Cheng-ying

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A Successive Approximation ADC Design for Implantable Intraocular Pressure Detection Application

更新时间：2026-09-04

- A Successive Approximation ADC Design for Implantable Intraocular Pressure Detection Application
- Vol. 34, Issue 11, Pages: 135-139(2017)
- 作者机构：
  
  1. 北京理工大学信息与电子学院,北京,100038
  2. 中国科学院机构微电子研究所,北京,100029
  3. 厦门理工学院机构微电子学院,福建,厦门,361024
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2017
- 稿件说明：
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马志峰, 李熙泽, 张锋, 陈铖颖. 基于植入式眼压检测应用的低功耗SAR ADC设计[J]. 微电子学与计算机, 2017, 34(11): 135-139.

MA Zhi-feng, LI Xi-ze, ZHANG Feng, et al. A Successive Approximation ADC Design for Implantable Intraocular Pressure Detection Application[J]. 2017, 34(11): 135-139.
马志峰, 李熙泽, 张锋, 陈铖颖. 基于植入式眼压检测应用的低功耗SAR ADC设计[J]. 微电子学与计算机, 2017, 34(11): 135-139. DOI：

MA Zhi-feng, LI Xi-ze, ZHANG Feng, et al. A Successive Approximation ADC Design for Implantable Intraocular Pressure Detection Application[J]. 2017, 34(11): 135-139. DOI：

摘要

为了确保植入式眼压传感器在体内长期保持稳定的工作状态

同时能较为精准地反映人体眼压变化

设计了一种应用于青光眼治疗的植入式眼压检测传感器的10 bit

20 kS/s低功耗逐次逼近型数字模拟转换器(SAR ADC).该电路内置的DAC使用全电容阵列设计

利用对称电容阵列结构提高缩放电容的匹配精度; 比较器采用三级预放大器加一级动态锁存器结构

并引入了失调校准功能.电路采用SMIC 0.18 m 1P6M工艺进行设计

后仿真结果表明

在20 kS/s的采样速率下

有效位数可达9.4 bit

平均功耗仅为44.7 W.

Abstract

In order to ensure the long-term stable working state and detection resolution of implantable intraocular pressure sensor

a 10 bit

20 KS/s low power successive approximation analog to digital converter (SAR ADC) for implantable intraocular pressure detection sensor application is proposed in this paper. The DAC adopts a full capacitance array design. The symmetrical capacitor array structure improves the matching accuracy of the scaling capacitor; Comparator with three-stage pre-amplifier and dynamic latch structure ensures the offset calibration function. The circuit is implemented with SMIC 0.18 m CMOS technology and the post-simulation results show that the effective number of bits (ENOB) can reach 9.4 bit at 20 KS/s sampling rate

and the average power consumption is only 44.7 W.

关键词

Keywords

references

Boujamaa E M, Alandry B, Hacinef B. Low power interface circuit for resistive sensors with digital offset compensation[C]//IEEE Int. Symp. Circuits and Systems. IEEE, 2010: 3092-3095.

孙彤. 低功耗逐次逼近模数转换器的研究与设计[D]. 北京: 清华大学, 2007.

Pang Wen-Yi, Wang Chao-Shiun, Chang You-Kuang, et al. A 10-bit 500-KS/s Low Power SAR ADC with splitting comparator for bio-medical applications[C]//IEEE Asian Solid-State Circuits Conference. IEEE, 2009: 149-152.

Chitnis G, Maleki T, Samuels B, et al. A mini-mally invasive implantable wireless pressure sensor for continuous IOP monitoring[J]. IEEE Trans. Biomed. Eng., 2013, 60(1): 250-256. DOI: 250

林武平, 郭良权, 于宗光, 等. 新型高速低功耗动态比较器[J]. 半导体技术, 2008, 33(12) : 1119-1122. DOI: 1119

Chang You-Kuang, Wang Chao-Shiun, Wang Chorng-Kuang. 8-bit 500-KS/s low power SAR ADC for biomedical application[J]. IEEE Solid-State Ciruits, 2007: 228-231. DOI: 228

Alan Hastings. 模拟电路版图的艺术(2版)[M]. 北京: 电子工业出版社, 2007.

Allen P E, Holberg D R. CMOS. 模拟集成电路设计[M]. 冯军, 李智群, 译. 北京: 电子工业出版社, 2011.

侯斌, 莫亭亭. 用于16 bit SAR ADC的高精度比较器的设计[J]. 微电子学与计算机, 2016, 33(7): 15-18. DOI: 15

Donida A, Di Dato G, Cunzolo P, et al. 21.7A0.036mbar circadian and cardiac intraocular pressure sensor for smart implantable lens[J]. IEEE Int. Solid-State Circuits Conf, 2015(22/26): 392-394. DOI: 392

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