Reference : A MEMS Interface IC with Low-Power and Wide-Range Frequency-to-Voltage Converter for ...
Scientific journals : Article
Engineering, computing & technology : Electrical & electronics engineering
http://hdl.handle.net/2268/227764
A MEMS Interface IC with Low-Power and Wide-Range Frequency-to-Voltage Converter for Biomedical Applications
English
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 mailto [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]
2016
IEEE Transactions on Biomedical Circuits and Systems
Institute of Electrical and Electronics Engineers Inc.
10
2
455-466
Yes (verified by ORBi)
International
1932-4545
[en] 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
[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.
FT130100430, ARC, Australian Research Council
http://hdl.handle.net/2268/227764
10.1109/TBCAS.2015.2435256

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