Title :
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
fDate :
Nov. 30 2008-Dec. 3 2008
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;
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
DOI :
10.1109/APCCAS.2008.4745974
