2015•Unpublished venueRequires access
An interfacing circuit for differential capacitive sensor and its performance analysis
Karunamoy Chatterjee, Sankar Narayan Mahato, Sourav Bhattacharyya, Dhananjoy De
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Abstract
This paper presents an interface circuit to measure various parameters in voltage mode by very small capacitance change in capacitive sensors. Differential capacitance comprises a capacitance-to-voltage conversion with low power, high speed and greater accuracy. Differential capacitance operation principle yields a high-precision measurement for capacitive sensors with increased signal-to-noise immunity. Double differential operating principle minimizes error caused by parasitic capacitance and stray capacitance of the sensor probes. Differential capacitance measurement comprises a capacitance-to-voltage conversion with low power, high speed and greater accuracy. Differential capacitance operation principle yields a high-precision measurement for capacitive sensors with increased signal-to-noise immunity. Double differential operating principle can also minimizes error caused by parasitic capacitance and stray capacitance of the sensor probes.