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Appl. Sci. 2015, 5(3), 402-414; doi:10.3390/app5030402

New Programmable CMOS Fuzzifier and C2V Circuits Applicable in FLC Chip for Signal Processing of MEMS Glucose Sensors

1
Department of Electrical Electronics Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778-93855, Iran
2
Department of Electrical Electronics Engineering, Iran University of Science and Technology, Tehran 16846, Iran
3
Department of Electrical Electronics Engineering, Khaje Nasir Toosi University of Technology, Tehran 19991-43344, Iran
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Hung-Yu Wang
Received: 15 June 2015 / Revised: 7 August 2015 / Accepted: 11 August 2015 / Published: 18 August 2015
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Abstract

This paper presents the design and simulation of improved circuits of Fuzzifier and capacitance to voltage (C2V) converter. The Fuzzifier circuit is designed based on analog advantages such as low die area, high accuracy, and simplicity which are added to the fuzzy system advantages. For implementing this idea, a programmable Membership Function Generator (MFG) including differential pair circuit as a Fuzzifier is proposed. The MFG generates arbitrary forms of Gaussian, Trapezoidal, and Triangular shapes. The shape types are achieved using control switches and different reference voltages. This structure is also general purpose in tuning the slope of Membership Functions (MFs) using scaled transistors with different W/L ratios. With a specific purpose in mind, we used it here to generate fuzzy language terms from sensed classic data of a blood glucose microsensor. Thus we proposed a C2V circuit to convert capacitance variations (from MEMS glucose microsensor) to voltage values as classic data. The proposed mentioned circuits can be applicable in design of Fuzzy Logic Controller (FLC) chips to detect blood glucose, process its data in Fuzzy environment, and control insulin injection of diabetic patients by MEMS micropumps. The simulation results are achieved by MATLAB and Hspice software in 0.35 μm CMOS standard technology. View Full-Text
Keywords: fuzzifier; membership function; differential pair; C2V; MEMS glucose microsensor; CMOS FLC chip fuzzifier; membership function; differential pair; C2V; MEMS glucose microsensor; CMOS FLC chip
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yosefi, G.; Mirzakuchaki, S.; Raissi, F. New Programmable CMOS Fuzzifier and C2V Circuits Applicable in FLC Chip for Signal Processing of MEMS Glucose Sensors. Appl. Sci. 2015, 5, 402-414.

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