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http://dx.doi.org/10.5369/JSST.2005.14.1.028

A CMOS integrated circuit design of charge-sharing scheme for a capacitive fingerprint sensor  

Nam, Jin-Moon (Dept. of Electrical & Electronics Eng., Graduate School, Yonsei Univ.)
Lee, Moon-Key (Dept. of Electrical & Electronics Eng., Graduate School, Yonsei Univ.)
Publication Information
Journal of Sensor Science and Technology / v.14, no.1, 2005 , pp. 28-32 More about this Journal
Abstract
In this paper, a CMOS integrated detection circuit for capacitive type fingerprint sensor signal processing is described. We designed a detection circuit of charge-sharing sensing scheme. The proposed detection circuit increases the voltage difference between a ridge and valley. The test chip is composed of $160{\times}192$ array sensing cells (12 by $12.7{\;}mm^{2}$). The chip was fabricated on a 0.35 m standard CMOS process. Measured difference voltage between a ridge and valley was 0.95 V.
Keywords
fingerprint sensor; capacitive type; charge-sharing; pixel array;
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