An UHF RFID transponder with novel demodulator and security algorithm

An UHF Radio Frequency Identification (RFID) transponder, which can function according to either standard ISO 18000-6 B or security ISO 18000-6 B with Advanced Encryption Standard (AES), is presented in this paper. The UHF RFID transponder is composed of analog front-end (AFE) and digital signal processing unit. A novel demodulator in AFE is presented in this paper. Silicon area occupied by the demodulator is only 21% of traditional structure and it could demodulate input signal with data rate ranging from 10 Kbps to 870 Kbps. In digital processing unit, 128-bit AES algorithm is built in to ensure security communication between transponder and reader. Total chip area without test pads is 0.7 mm²@0.18 mum CMOS process and consumes 15 muW without writing Memory.