A new fully differential CMOS capacitance to digital converter for lab-on-chip applications

Ghazal Nabovati; Ebrahim Ghafar-Zadeh; Maryam Mirzaei; Giancarlo Ayala-Charca; Falah Awwad; Mohamad Sawan

doi:10.1109/TBCAS.2014.2336596

A new fully differential CMOS capacitance to digital converter for lab-on-chip applications

Ghazal Nabovati, Ebrahim Ghafar-Zadeh, Maryam Mirzaei, Giancarlo Ayala-Charca, Falah Awwad, Mohamad Sawan

Department of Electrical and Communication Engineering

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

In this paper, we present a new differential CMOS capacitive sensor for Lab-on-Chip applications. The proposed integrated sensor features a DC-input ΣΔ capacitance to digital converter (CDC) and two reference and sensing microelectrodes integrated on the top most metal layer in 0.35 μ 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.

Original language	English
Article number	6876025
Pages (from-to)	353-361
Number of pages	9
Journal	IEEE Transactions on Biomedical Circuits and Systems
Volume	9
Issue number	3
DOIs	https://doi.org/10.1109/TBCAS.2014.2336596
Publication status	Published - Jun 1 2015

Keywords

CMOS
Capacitive sensor
chemical sensor
lab-on-chip
ΣΔ modulator

ASJC Scopus subject areas

Biomedical Engineering
Electrical and Electronic Engineering

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10.1109/TBCAS.2014.2336596

Cite this

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title = "A new fully differential CMOS capacitance to digital converter for lab-on-chip applications",

abstract = "In this paper, we present a new differential CMOS capacitive sensor for Lab-on-Chip applications. The proposed integrated sensor features a DC-input ΣΔ capacitance to digital converter (CDC) and two reference and sensing microelectrodes integrated on the top most metal layer in 0.35 μ 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.",

keywords = "CMOS, Capacitive sensor, chemical sensor, lab-on-chip, ΣΔ modulator",

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AU - Ayala-Charca, Giancarlo

AU - Awwad, Falah

AU - Sawan, Mohamad

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A new fully differential CMOS capacitance to digital converter for lab-on-chip applications

Abstract

Keywords

ASJC Scopus subject areas

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