Title :
A 390 dpi live fingerprint imager based on feedback capacitive sensing scheme
Author :
Tartagni, M. ; Guerrieri, R.
Author_Institution :
Dipartimento di Elettronica Inf. e Sistemistica, Bologna Univ., Italy
Abstract :
A single-chip, 200/spl times/200 element sensor array grabs a fingerprint pattern without any optical or mechanical adaptors. Using this integrated sensor the fingerprint is captured at a rate ofl0/Frame/s by pressing the finger skin onto the chip surface. The fingerprint pattern is sampled by capacitive sensors that detect the electric field variation induced by the skin surface. The architecture is integrated in standard 2-metal 0.7 /spl mu/m digital CMOS technology. The idea of using a capacitive sensor array for detecting fingerprints has been suggested, but not implemented. The sensor described here uses a scheme, substantially different from previous approaches, based on feedback capacitance sensing.
Keywords :
CMOS integrated circuits; capacitance measurement; electric sensing devices; feedback; fingerprint identification; mixed analogue-digital integrated circuits; 0.7 micron; capacitive sensor array; digital CMOS technology; electric field variation; feedback capacitive sensing scheme; fingerprint imager; fingerprint pattern; integrated sensor; single-chip sensor array; skin surface; CMOS technology; Capacitive sensors; Fingerprint recognition; Image matching; Mechanical sensors; Optical arrays; Optical feedback; Optical sensors; Sensor arrays; Skin;
Conference_Titel :
Solid-State Circuits Conference, 1997. Digest of Technical Papers. 43rd ISSCC., 1997 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3721-2
DOI :
10.1109/ISSCC.1997.585332
