earticle

영어

This paper proposes a fingerprint sensor cell and its structure using pseudo-direct scheme. The fingerprint sensor cell uses an internal transmitted (Tx) plate instead of using an external bezel as a contact for direct signal driving to finger. It uses an active output voltage feedback (AOVF) integrator and multiple integration scheme to maximize the sensitivity and improve signal-to-noise ratio (SNR) as well. The circuit models of combined fingerprint and Tx electrode were analyzed and simulated using MATLAB. And the proposed fingerprint sensor were designed and simulated with standard 0.35μm CMOS technology. Simulations verified that the proposed fingerprint sensor using pseudo-direct scheme can be effectively used as a personal authentication method especially in mobile applications.