• Nurul Arfah Che Mustapha International Islamic University Malaysia
  • A.H.M. Zahirul Alam International Islamic University Malaysia https://orcid.org/0000-0003-4259-2852
  • Sheroz Khan International Islamic University Malaysia
  • Amelia Wong Azman International Islamic University Malaysia




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


[1] C. Kompis and S. Aliwell. “Energy harvesting technologies to enable remote and wireless sensing,” Sensors and Instrumentation KTN Report, pp. 1-72, 2008.

[2] T. Krupenkin. “Method and apparatus for energy harvesting using microfluidics,” USA # 7898096, 2011.

[3] L. Wang and F. Yuan. “Energy harvesting by magnetostrictive material (msm) for powering wireless sensors in shm”, SPIE Smart Structures and Materials, 2007.

[4] S. Beeby, M. Tudor, and N. White. “Energy harvesting vibration sources for microsystems applications,” Measurement Science and Technology, vol. 17, no. 12, pp. R175-R195, 2006.

[5] G. Park, T. Rosing, M. Todd, C. Farrar, and W. Hodgkiss. “Energy Harvesting for Structural Health Monitoring Sensor Networks,” J. Infrastruct. Syst., vol. 14, no. 1, pp. 64-79, 2008.

[6] H. Kloub, D. Hoffmann, B. Folkmer, and Y. Manoli. “A micro capacitive vibration energy harvester for low power electronics,” PowerMEMS 2009, Washington DC, USA, pp. 165-168, 2009.

[7] Louisiana Tech University, “Shoe power generator, embedded in the sole of a shoe, harvest energy”,. Science Daily. Retrieved March 24, 2012, from http://www.sciencedaily.com¬ /releases/2010/04/100426113137.htm , 2010.

[8] T. Krupenkin and J. Taylor. “Reverse electrowetting as a new approach to high-power energy harvesting,” Nature Communications, vol. 2, p. 448, 2011.

[9] F. Cottone. “Introduction to vibration energy harvesting”, [PowerPoint slides]. Retrieved from http://wwwnipslab.org/files/file/nips%20summer%20school%202011/Cottone%20Introduction%20to%20vibration%20harvesting.pdf , 2011.

[10] P. Harrop and R. Das. “Energy Harvesting and storage for electronic device 2009-2019”, IDTechEx Report, 2009.

[11] D. Zhu, S. Beeby, J. Tudor, N. White, and N. Harris. “A novel miniature wind generator for wireless sensing applications”, at IEEE Sensors 2010, pp. 1-4. Retrieved from http://eprints.soton.ac.uk/271682/, 2010.

[12] S. Sharma. “Estyle buyers’ guide: your prescription to the right tablet”, Electronics for You, vol. 44, no.2, pp. 88, 2012.

[13] S. Sharma. “Embedded: touch screens what’s the latest?”, Electronics for You, vol. 44, no.2, pp. 88, 2012.

[14] C. Viehweger, M. Baldauf, T. Keutel, and O. Kanoun. “Hybrid energy harvesting for autonomous sensors in building automation”, 2012 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2012) Proceedings, pp. 610-613, 2012.

[15] I. Kuehne, A. Frey, G. Eckstein, U. Schmi, and H. Seidel. “Design and analysis of a capacitive vibration-to-electrical energy converter with built-in voltage”, Solid-State Device Research Conference, vol. 36, pp. 138 – 141, 2006.

[16] Stevens Institute of Technology Miniature, “Energy harvesting technology could power wireless electronics”, Science Daily. Retrieved March 22, 2012, from http://www.sciencedaily.com¬ /releases/2010/07/100709131308.htm, 2010.

[17] M. Edamoto, Y. Suzuki, N. Kasagi, K. Kashiwagi, Y. Morizawa, T. Yokoyama, T. Seki, and M. Oba, “Low-resonant-frequency micro electret generator for energy harvesting application”, Proc. IEEE Int. Conf. MEMS 2009, Sorrento, pp. 1059-1062, 2009.

[18] T. Sterken, K. Baert, R. Puers, G. Borghs, and R. Mertens. “A new power mems component with variable capacitance,” Pan Pacific Microelectronic Symposium 2003, pp. 27-34, 2003.

[19] J. Arakawa, Y. Suzuki, and N. Kasagi. “Micro seismic power generator using electret polymer film,” The Fourth International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications 2004, pp. 187-190, 2004.

[20] I. Kuehne. “Power mems—a capacitive vibration-to-electrical energy converter with built-in voltage”, Sensors and Actuators A: Physical (142)1, 263-269. doi:10.1016/j.sna.2007.02.036, 2008.

[21] M. R. Haider, M. R. Mahfouz, S. K. Islam, S. A. Eliza, W. Qu, and E. Pritchard. “A low-power capacitance measurement circuit with high resolution and high degree of linearity”, Midwest Symposium on Circuits and Systems, pp. 261–264, 2008.

[22] Analog Devices. (1997-2008). “AD623: Single-Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier”. [Online]. Available : www.analog.com/media/en/technical-documentation/data-sheets/AD623.pdf [Oct 22, 2015]




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




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