earticle

영어

This paper proposes a fingerprint sensor cell and driver architecture based on a charge integration scheme. The fingerprint sensor cell uses an active output voltage feedback (AOVF) integrator as a capacitance-to-voltage converter. A multiple integration scheme is suggested to improve signal-to-noise ratio (SNR) and amplify the sensing signal, which enables a simple and robust fingerprint sensor driver architecture. A prototype fingerprint sensor array of 1x64 is implemented with an AOVF integrator. The performances of the proposed fingerprint sensor were simulated with standard 0.35μm CMOS technology. By simulations, the proposed fingerprint sensor senses even sub-femto farad differences and has large sensing voltage range.