Abstract
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.
Highlights
In instrumentation and measurement research field, capacitive sensor measuring system provides efficient changes of parameter of interest into various range of capacitance conversion
There have been great efforts on the readout circuit and several reported ways of conversion using capacitance sensing for sensor interface circuits
Before capacitance conversion takes place into other forms like frequency, phase or digital, it first converts into voltages and continue its conversion process into desired forms depending on the design and method used in the system
Summary
In instrumentation and measurement research field, capacitive sensor measuring system provides efficient changes of parameter of interest into various range of capacitance conversion. Such advantage takes place without functionality loss compared to resistive and inductive sensors [1]. The design of capacitive sensors can be categorized into several requirements Such requirements are shown in works that require accuracy [3], resolution [4], noise immunity [5] and sensitivity [6]. Before capacitance conversion takes place into other forms like frequency, phase or digital, it first converts into voltages and continue its conversion process into desired forms depending on the design and method used in the system. Focus of this paper is on frequency at 300 kHz
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