Parasitic consideration for differential capacitive sensor

• Main Authors: Che Mustapha, Nurul Arfah, Alam, A. H. M. Zahirul, Khan, Sheroz, Azman, Amelia Wong
• Format: Article
• Language: English; English
• Published: Universitas Ahmad Dahlan in collaboration with IAES Indonesia Section 2019
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://irep.iium.edu.my/74621/1/74621_Parasitic%20consideration%20for%20differential%20capacitive.pdf; http://irep.iium.edu.my/74621/2/74621_Parasitic%20consideration%20for%20differential%20capacitive_SCOPUS.pdf; http://irep.iium.edu.my/74621/; http://journal.portalgaruda.org/index.php/EEI/article/view/1526

Parasitic integration for a single supply differential capacitive sensing technique is presented in this paper. In real capacitive sensor measurement, parasitic impedance exists 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.