A circuit that combines the functionality of a biometric reader and an RFID circuit is provided. This circuit uses certain functional blocks for processing both t h e biometric signals and the RFID signals. As a result, the space and power consumed by the circuit are substantially reduced such that the...http://www.google.com.tw/patents/US6672512?utm_source=gb-gplus-share專利 US6672512 - Combined biometric reader/RFID circuit
