Provided is a multiplexer for a biometric apparatus. The multiplexer includes a plurality of first conductors coupled to the first ends of piezo ceramic elements in corresponding rows and a plurality of first switches each of which is coupled to a respective one of the first conductors and a plurality...http://www.google.fr/patents/US7514842?utm_source=gb-gplus-shareBrevet US7514842 - Multiplexer for a piezo ceramic identification device
Multiplexer for a piezo ceramic identification device
