EFFICIENT CAPACITANCE SENSING FOR WIRELESS HEALTH MONITORING SYSTEM

  • Nurul Arfah Che Mustapha International Islamic University Malaysia
  • A.H.M. Zahirul Alam International Islamic University Malaysia
  • Sheroz Khan International Islamic University Malaysia
  • Amelia Wong Azman International Islamic University Malaysia

Abstract

This paper presents a low power capacitance to voltage converter (CVC) circuit using two differential amplifier circuits, two Schottky rectifier diodes constructed in symmetrical manner and combined with instrumentation amplifier circuits. The differential capacitance to voltage simulation work has been realized with cheap discrete components. Combination energy from solar, vibration and heat is expected to be used to source the capacitance circuit. Constant dc voltage of 3 V has been used to source the CVC circuit in this work. It is found by the simulation, the converter circuit consumes 3.9 mW of total power, operates at 40 kHz using 400 mV excitation signal. The circuit is able to detect changes of capacitance from 4 – 12.5 pF using reference capacitance of 5 pF. Sensitivity of 0.132 mV for 1 fF capacitance change has been observed in the circuit. This circuit is suitable for wireless health monitoring system.

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Author Biographies

Nurul Arfah Che Mustapha, International Islamic University Malaysia
Dept. of ECE
A.H.M. Zahirul Alam, International Islamic University Malaysia
Dept. of ECE
Sheroz Khan, International Islamic University Malaysia
Dept. of ECE
Amelia Wong Azman, International Islamic University Malaysia
Dept. of ECE

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Published
2016-11-30
How to Cite
Che Mustapha, N. A., Zahirul Alam, A., Khan, S., & Wong Azman, A. (2016). EFFICIENT CAPACITANCE SENSING FOR WIRELESS HEALTH MONITORING SYSTEM. IIUM Engineering Journal, 17(2), 21-29. https://doi.org/10.31436/iiumej.v17i2.609
Section
Articles