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A 600-dpi capacitive fingerprint sensor chip and image-synthesis technique

机译:600 dpi电容式指纹传感器芯片和图像合成技术

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摘要

This paper examines the possibility of a low-cost, high-resolution fingerprint sensor chip. The test chip is composed of 64/spl times/256 sensing cells (chip size: 2.7/spl times/10.8 mm/sup 2/). A new detection circuit of charge sharing is proposed, which eliminates the influences of internal parasitic capacitances. Thus, the reduced sensing-capacitor size enables a high resolution of 600 dpi, even using a conventional 0.6 /spl mu/m CMOS process. The partial fingerprint images captured are synthesized into a full fingerprint image with an image-synthesis algorithm. The problems and possibilities of this image-synthesis technique are also analyzed and discussed.
机译:本文研究了低成本,高分辨率的指纹传感器芯片的可能性。测试芯片由64 / spl次/ 256个传感单元组成(芯片尺寸:2.7 / spl次/10.8 mm / sup 2 /)。提出了一种新型的电荷共享检测电路,该电路消除了内部寄生电容的影响。因此,即使使用传统的0.6 / spl mu / m CMOS工艺,减小的传感电容器尺寸也可以实现600 dpi的高分辨率。利用图像合成算法将捕获的部分指纹图像合成为完整的指纹图像。还分析并讨论了这种图像合成技术的问题和可能性。

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