A New Fully Differential CMOS Capacitance to Digital Converter for Lab-on-Chip Applications

被引：19

作者：

Nabovati, Ghazal ^{[1
]}

Ghafar-Zadeh, Ebrahim ^{[2
]}

Mirzaei, Maryam ^{[1
]}

Ayala-Charca, Giancarlo ^{[1
]}

Awwad, Falah ^{[3
]}

Sawan, Mohamad ^{[1
]}

机构：

[1] Polytech Montreal, Polystim Neurotechnol Lab, Dept Elect Engn, Montreal, PQ H3T 1J4, Canada

[2] York Univ, Elect Engn & Comp Sci Dept, Toronto, ON M3J 1P3, Canada

[3] United Arab Emirates Univ, Abu Dhabi 00000, U Arab Emirates

来源：

IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS | 2015年 / 9卷 / 03期

基金：

加拿大自然科学与工程研究理事会; 新加坡国家研究基金会;

关键词：

Capacitive sensor; chemical sensor; CMOS; lab-on-chip; Sigma Delta modulator; SENSOR ARRAY;

D O I：

10.1109/TBCAS.2014.2336596

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

In this paper, we present a new differential CMOS capacitive sensor for Lab-on-Chip applications. The proposed integrated sensor features a DC-input Sigma Delta capacitance to digital converter (CDC) and two reference and sensing microelectrodes integrated on the top most metal layer in 0.35 mu m CMOS process. Herein, we describe a readout circuitry with a programmable clocking strategy using a Charge Based Capacitance Measurement technique. The simulation and experimental results demonstrate a high capacitive dynamic range of 100 fF-110 fF, the sensitivity of 350 mV/ fF and the minimum detectable capacitance variation of as low as 10 aF. We also demonstrate and discuss the use of this device for environmental applications through various chemical solvents.

引用

页码：353 / 361

页数：9

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