A low-power bio-sensor interface with wide measurement range

Author

Chai, Y. ; Chan, P.K.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

fYear

2008

fDate

Nov. 30 2008-Dec. 3 2008

Firstpage

117

Lastpage

120

Abstract

A new low-power high dynamic range conductance-to-frequency converter, using relaxation oscillator approach, is proposed for bio-sensor interfacing applications. Enhanced by a leakage current compensation technique, the interface has immunity against input pad ESD leakage current as well as hum noise. The output frequency is linear with respect to sensor conductance, with the maximum systematic error of 0.58% and average error of 0.46% for nanowire sensor resistance from 100 MOmega ~ 1 GOmega. For 2% systematic error, the resistance range of the interfacing system can attain from 5 MOmega to 5 GOmega. The bio-sensor interface is designed using CSM 0.18 mum CMOS technology, which dissipates 37.2 muW at a single supply of 1.8 V and the maximum sensor current.

Keywords

CMOS integrated circuits; biosensors; leakage currents; low-power electronics; relaxation oscillators; conductance-to-frequency converter; leakage current compensation technique; low-power bio-sensor interface; power 37.2 muW; relaxation oscillator approach; size 0.18 mum; voltage 1.8 V; wide measurement range; Biosensors; Cancer; Circuits; Electrostatic discharge; Frequency conversion; Immune system; Leakage current; MOS capacitors; Oscillators; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on

Conference_Location

Macao

Print_ISBN

978-1-4244-2341-5

Electronic_ISBN

978-1-4244-2342-2

Type

conf

DOI

10.1109/APCCAS.2008.4745974

Filename

4745974