ISFET's Interface Circuit for Biomedical Applications Using Delta-Sigma Modulation

被引：0

作者：

Bumrungyat, Puvanat ^{[1
]}

Kasemsuwan, Varakorn ^{[1
]}

机构：

[1] King Mongkuts Inst Technol Ladkrabang, Dept Elect, Fac Engn, Bangkok 10520, Thailand

来源：

2018 11TH BIOMEDICAL ENGINEERING INTERNATIONAL CONFERENCE (BMEICON 2018) | 2018年

关键词：

ISFET pH sensor; Biosensor; Readout circuit; Linear region; Delta-sigma modulation;

D O I：

暂无

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

This paper presents a new ISFET's interface circuit for biomedical applications using delta-sigma modulation. The proposed design operates ISFET in the linear region so that an output current is linearly dependent on pH over a wide range (pH 2 to pH 14). Conversion to a digital output domain is done using a sigma-delta converter making the interface circuit very robust and reliable for most sensor applications. The proposed circuit is designed in a 0.18 pm technology. The supply voltage is 1.8 V and the total current drawn is 56 pA. The simulation results show that the proposed circuit can sense a pH with an error within the range of -0.2% to 0.3% for pH ranging from 2 to 14.

引用

页数：5

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