Title: Versatile Sensor Front End for Low-Depth Modulation Capacitive Sensors
Abstract: Low-depth modulation capacitive sensors, i.e. sensors where the capacitance variations caused by a measurand are only a small fraction of the total capacitance, are frequently encountered in measurement problems. Furthermore, also a conductance (e.g. due to parasitic conductive staining) between the sensor electrodes may affect the capacitance evaluation. We have implemented a capacitive sensor interface in a 0.25 μm CMOS process capable of measuring both conductive and capacitive coupling. The sensor interface provides an offset capacitance compensation and an offset conductance compensation such that a low-depth capacitance modulation can be mapped onto the full scale range of an Analog to Digital Converter. Experimental results for a prototype sensor interface with a capacitive slider array are presented.
Publication Year: 2008
Publication Date: 2008-05-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 23
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