Title :
A capacitive hybrid flip-chip ASIC and sensor for fingerprint, navigation and pointer detection
Author :
Vermesan, O. ; Riisnaes, K.H. ; Le-Pailleur, L. ; Nysaether, J.B. ; Bauge, M. ; Rustad, H. ; Clausen, S. ; Blystad, L.-C. ; Grindvoll, H. ; Pedersen, R. ; Pezzani, R. ; Kaire, D.
Author_Institution :
SINTEF, Oslo, Norway
Abstract :
A fingerprint detection technology that supports navigation, pointer and fingerprint acquisition is described. The hybrid system consists of a silicon sensor substrate flip-chipped onto a mixed signal ASIC. The sensor is linear and the finger is swept over to scan the fingerprint. To achieve 500 dpi accuracy, separate process optimization for both the ASIC and the sensor substrate gives a alternative solution compared to all silicon sensor approaches. The ASIC is 18 mm/sup 2/ in 0.25 /spl mu/m CMOS and the sensor is 105 mm/sup 2/.
Keywords :
CMOS integrated circuits; capacitive sensors; circuit optimisation; fingerprint identification; flip-chip devices; mixed analogue-digital integrated circuits; 0.25 /spl mu/m CMOS; 0.25 micron; CMOS sensor chips; Si; capacitive hybrid flip-chip ASIC; fingerprint detection technology; hybrid system; mixed signal ASIC; navigation; pointer detection; process optimization; sensor; silicon sensor substrate; Application specific integrated circuits; CMOS technology; Capacitance; Capacitive sensors; Fingerprint recognition; Fingers; Multiplexing; Navigation; Sensor phenomena and characterization; Silicon;
Conference_Titel :
Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC. 2003 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-7707-9
DOI :
10.1109/ISSCC.2003.1234272
