Open AccessFrequency dependency analysis for differential capacitive sensor
Author(s) -
Nurul Arfah Che Mustapha,
A. H. M. Zahirul Alam,
Sheroz Khan,
Amelia Wong Azman
Publication year - 2019
Publication title -
bulletin of electrical engineering and informatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.251
H-Index - 12
ISSN - 2302-9285
DOI - 10.11591/eei.v8i3.1524
Subject(s) - capacitive sensing , capacitive power supply , linearity , capacitor , dependency (uml) , differential (mechanical device) , voltage , power (physics) , electronic engineering , electrical engineering , engineering , power factor , physics , constant power circuit , systems engineering , quantum mechanics , aerospace engineering
A differential capacitive sensing technique is discussed in this paper. The differential capacitive sensing circuit is making use of a single power supply. The design focus for this paper is on the excitation frequency dependency analysis to the circuit. Theory of the differential capacitive sensor under test is discussed and derivation is elaborated. Simulation results are shown and discussed. Next, results improvement has also been shown in this paper for comparison. Test was carried out using frequency from 40 kHz up to 400 kHz. Results have shown output voltage of Vout=0.07927 Cx+1.25205 and good linearity of R-squared value 0.99957 at 200 kHz. Potential application for this capacitive sensor is to be used for energy harvesting for its potential power supply.