A robust parasitic-insensitive successive approximation capacitance-to-digital converter
Type
Conference PaperKAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionElectrical Engineering Program
Physical Science and Engineering (PSE) Division
Sensors Lab
Date
2014-09Permanent link to this record
http://hdl.handle.net/10754/564996
Metadata
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In this paper, we present a capacitive sensor digital interface circuit using true capacitance-domain successive approximation that is independent of supply voltage. Robust operation is achieved by using a charge amplifier stage and multiple comparison technique. The interface circuit is insensitive to parasitic capacitances, offset voltages, and charge injection, and is not prone to noise coupling. The proposed design achieves very low temperature sensitivity of 25ppm/oC. A coarse-fine programmable capacitance array allows digitizing a wide capacitance range of 16pF with 12.5-bit quantization limited resolution in a compact area of 0.07mm2. The fabricated prototype is experimentally verified using on-chip sensor and off-chip MEMS capacitive pressure sensor. © 2014 IEEE.Citation
Omran, H., Arsalan, M., & Salama, K. N. (2014). A robust parasitic-insensitive successive approximation capacitance-to-digital converter. Proceedings of the IEEE 2014 Custom Integrated Circuits Conference. doi:10.1109/cicc.2014.6946080Conference/Event name
36th Annual Custom Integrated Circuits Conference - The Showcase for Integrated Circuit Design in the Heart of Silicon Valley, CICC 2014ISBN
9781479932863ae974a485f413a2113503eed53cd6c53
10.1109/CICC.2014.6946080