Article (Scientific journals)
A MEMS Interface IC with Low-Power and Wide-Range Frequency-to-Voltage Converter for Biomedical Applications
Arefin, M. S.; Redouté, Jean-Michel; Yuce, M. R.
2016In IEEE Transactions on Biomedical Circuits and Systems, 10 (2), p. 455-466
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Keywords :
Capacitive pH sensor; Capacitive sensors; Charge pump circuits; CMOS integrated circuits; Feedback; Frequency modulation; Inductive sensors; Logic circuits; Medical applications; Oscillators (electronic); Reconfigurable hardware; Biomedical applications; Controlling parameters; Coupled oscillators; External voltages; Frequency to voltage converters; Interface circuits; Sensitivity range; Switched capacitor; Frequency converter circuits; Algorithms; Biosensing Techniques; Electric Capacitance; Equipment Design; Micro-Electrical-Mechanical Systems
Abstract :
[en] This paper presents an interface circuit for capacitive and inductive MEMS biosensors using an oscillator and a charge pump based frequency-to-voltage converter. Frequency modulation using a differential crossed coupled oscillator is adopted to sense capacitive and inductive changes. The frequency-to-voltage converter is designed with a negative feedback system and external controlling parameters to adjust the sensitivity, dynamic range, and nominal point for the measurement. The sensitivity of the frequency-to-voltage converter is from 13.28 to 35.96 mV/MHz depending on external voltage and charging current. The sensitivity ranges of the capacitive and inductive interface circuit are 17.08 to 54.4 mV/pF and 32.11 to 82.88 mV/mH, respectively. A capacitive MEMS based pH sensor is also connected with the interface circuit to measure the high acidic gastric acid throughout the digestive tract. The sensitivity for pH from 1 to 3 is 191.4 mV/pH with 550 μ Vpp noise. The readout circuit is designed and fabricated using the UMC 0.18 μm CMOS technology. It occupies an area of 0.18 mm2 and consumes 11.8 mW. © 2015 IEEE.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Arefin, M. S.;  Biomedical Integrated Circuits and Sensors Laboratory (BICS), Department of Electrical and Computer Systems Engineering, Monash University, Melbourne, VIC 3800, Australia
Redouté, Jean-Michel  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés
Yuce, M. R.;  Biomedical Integrated Circuits and Sensors Laboratory (BICS), Department of Electrical and Computer Systems Engineering, Monash University, Melbourne, VIC 3800, Australia
Language :
English
Title :
A MEMS Interface IC with Low-Power and Wide-Range Frequency-to-Voltage Converter for Biomedical Applications
Publication date :
2016
Journal title :
IEEE Transactions on Biomedical Circuits and Systems
ISSN :
1932-4545
eISSN :
1940-9990
Publisher :
Institute of Electrical and Electronics Engineers Inc.
Volume :
10
Issue :
2
Pages :
455-466
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
ARC FT130100430
Funders :
ARC - Australian Research Council [AU]
Available on ORBi :
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