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A 500 dpi capacitive CMOS fingerprint sensor with pixel-level adaptation image enhancement uses virtually-grounded metal shields to suppress parasitic capacitances and capacitive switching networks to generate local threshold level. A 210×100 sensor in 0.6 μm CMOS consumes 40 mW at 5 V supply.
Solid-State Circuits Conference, 2002. Digest of Technical Papers. ISSCC. 2002 IEEE International (Volume:1 )
Date of Conference: 7-7 Feb. 2002