Journal
2019 13TH INTERNATIONAL CONFERENCE ON SENSING TECHNOLOGY (ICST)
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/icst46873.2019.9047676
Keywords
Capacitance to pulse-width converter; Capacitive Sensor; Sinusoidal excitation; Closed-loop; Digitizer
Funding
- Department of Science and Technology (DST) [SERB/F/4573/2016-17]
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A novel closed-loop capacitance-to-pulse width converter (CPC) suitable for single element capacitive sensors that use sinusoidal excitation is presented in this paper. Its operation is realized using a new configuration based on a simple, yet effective, auto-balancing scheme. The hardware prototype of the proposed CPC is relatively less complex to implement than those presented so far in the literature. It provides a quasi-digital output at a high update rate. Additionally, the output is insensitive to parasitic capacitances of the sensor. The output possesses high linearity, with respect to change in the sensor capacitance, ranging +/-5 pF, with a nominal capacitance as high as 200 pF. It exhibits a maximum non-linearity error of 0.061%FS. The output of the prototype has a resolution of 13.31 bits. Also, its response time for a step-change in the sensor capacitance is about 13 ms. This sophisticated and inexpensive closed-loop CPC is a perfect fit as an interfacing circuit for single element capacitive sensors.
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