Parasitic Consideration for Differential Capacitive Sensor

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

Bulletin of Electrical Engineering and Informatics
Vol 8, No 3: September 2019

Parasitic integration for a single supply differential capacitive sensing technique is presented in this paper. In real capacitive sensor measurement, parasitic impedance in its measurement. This paper objective is to study the effect of capacitive and resistive parasitic to the capacitive sensor circuit. The differential capacitive sensor circuit derivation theory is elaborated first. Then, comparison is made using simulation. Test was carried out using frequency from 40 kHz up to 400 kHz. Result is presented and have shown good linearity of 0.99984 at 300 kHz, R-squared value. This capacitive sensor is expected to be used for energy harvesting application.