Title :
A zero-sink-current Schmitt trigger and window-flexible counting circuit for fingerprint sensor/identifier
Author :
Morimura, Hiroki ; Fujii, Kenichi ; Shigematsu, Satoshi ; Okazaki, Yasuo
Author_Institution :
NTT, Kanagawa, Japan
Abstract :
Pixel-parallel architecture with 1b ADC per pixel achieves 6.4μW dissipation. Pixel memory element and event counting sensing circuitry control fingerprint acquisition. A 224 x 256 pixel array is built in a 0.25μm CMOS process.
Keywords :
CMOS image sensors; counting circuits; fingerprint identification; trigger circuits; 224 pixel; 256 pixel; CMOS process; dynamic operation; event counting sensing circuitry; fingerprint identifier; fingerprint sensor; pixel memory element; pixel-parallel architecture; range accuracy; timing chart; window-flexible counting circuit; zero-sink-current Schmitt trigger; Counting circuits; Fingerprint recognition; Large scale integration; Latches; Power measurement; Semiconductor device measurement; Size measurement; Strontium; Threshold voltage; Trigger circuits;
Conference_Titel :
Solid-State Circuits Conference, 2004. Digest of Technical Papers. ISSCC. 2004 IEEE International
Print_ISBN :
0-7803-8267-6
DOI :
10.1109/ISSCC.2004.1332624
