Title :
Study of Front End of CMOS RFID Tag with Inductively-coupled Broadband Antenna
Author :
Kao, Yao-Huang ; Liu, Chia-Chuan ; Kuo, Hung-Chang
Author_Institution :
Dept. of Commun. Eng., Chung-Hua Univ., Hsinchu
Abstract :
Raxiio frequency identification (RFID) has received much attention. The ac to dc conversion efficiency is crucial for long range application in UHF band. The front end of the passive tag combined with the broadband antenna at 915 MHz is investigated. Two subjects of high efficient charge-pump and antenna matching are focused. The chip is fabricated by TSMC 0.18 um 1P6M CMOS. The antenna is on the 0.4 mm FR4 pc board. With ten stages of capacitor- diode pair, the multiplier factor is 8.575 and dc voltage can reach to 3.4 V and is regulated to 850 mV with input power lies between -6~8 dBm. Under matching, the communication range can reach to 4 m.
Keywords :
AC-DC power convertors; CMOS integrated circuits; broadband antennas; capacitors; radiofrequency identification; CMOS RFID tag; UHF band; ac to dc conversion efficiency; antenna matching; capacitor-diode pair; inductively-coupled broadband antenna; radio frequency identification; Broadband antennas; CMOS technology; Charge pumps; Microwave antennas; Microwave communication; Parasitic capacitance; RFID tags; Radiofrequency identification; Schottky diodes; Threshold voltage; RFID; charge pump; tag;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4555011
