Baseband Processor in UHF RFID Tags for Customs Application

A digital baseband processor for UHF RFID tags for customs application was designed,which was compatible with ISO 18000-6C protocol.Circuit architecture of digital baseband and module partition was analyzed,and key circuits,such as switch state acquisition and switch state detection-recording circuits,were described in particular.The circuit was implemented in TSMC's 0.18 μm 1P5M mixed-signal CMOS process embedded with EEPROM.Test results showed that the RFID tag had fulfilled all functions specified by the protocol,and it could record key-open times correctly.The circuit had a minimum operating voltage of 1 V,an average current of 6.7 μA and a power consumption of 6.7 μW,and it occupied a chip area of only 710 μm × 320 μm.