A zero-sink-current Schmitt trigger and window-flexible counting circuit for fingerprint sensor/identifier

摘要

Pixel-parallel architecture with 1b ADC per pixel achieves 6.4/spl mu/W dissipation. Pixel memory element and event counting sensing circuitry control fingerprint acquisition. A 224 x 256 pixel array is built in a 0.25/spl mu/m CMOS process.