Title :
A new Polysilicon TFT capacitive fingerprint sensor with advanced mismatch compensation
Author :
Rechatin, Cedric ; Audebert, Patrick ; Abouchi, Nacer ; Galvan, Jean-Marc
Author_Institution :
LETI, Grenoble
Abstract :
Low temperature poly-silicon thin film transistors (LTPS TFT) technology is very suitable for low cost fingerprint sensor. In this paper, a new LTPS TFT capacitive sensor is presented. The proposed sensing scheme is based on charge sensitive amplifiers using correlated double sampling techniques (CDS) for offset voltage cancellation. Simulation results exhibit that the random offset voltage is successfully compensated.
Keywords :
capacitive sensors; cryogenic electronics; elemental semiconductors; fingerprint identification; silicon; thin film sensors; thin film transistors; LTPS TFT capacitive fingerprint sensor; Si; charge sensitive amplifiers; correlated double sampling techniques; low-temperature poly-silicon thin film transistors; offset voltage cancellation; random offset voltage; CMOS technology; Capacitive sensors; Circuits; Costs; Fingerprint recognition; Glass; Intelligent sensors; Temperature sensors; Thin film transistors; Voltage;
Conference_Titel :
Electronics, Circuits and Systems, 2006. ICECS '06. 13th IEEE International Conference on
Conference_Location :
Nice
Print_ISBN :
1-4244-0395-2
Electronic_ISBN :
1-4244-0395-2
DOI :
10.1109/ICECS.2006.379686
