Title :
A transponder IC for wireless identification systems
Author :
Wu, Sau-Mou ; Yang, Jeng-Rem ; Liu, Tzen-Yi
Author_Institution :
Dept. of Electr. Eng., Yuan-Ze Inst. of Technol., Taoyuan, Taiwan
Abstract :
A novel batteryless, self-powered transponder design as well as its chip layout is presented. The transponder operates in two phases. First, the chip is energized by rectifying the electromagnetic energy from the interrogating RF field from the RFID base station; the extracted energy is temporarily stored and is thereafter used to power the whole circuitry. Second, the transponder starts to transmit coded data by FSK modulation back to the base station. The major part of the design uses a digital CMOS circuit, thus it is simple and easy to implement. The circuit is designed such that the output frequencies are independent of the load of the antenna; the simulation results show that the tolerance of the antenna variation is within ±10%. The design is compatible with the TIRIS system, a popular RFID product designed by Texas Instruments. It operates in the 134.2 and 123.2 kHz frequency bands. The layout occupies about 0.8 um×0.8 um area
Keywords :
CMOS digital integrated circuits; frequency shift keying; identification; tracking; transponders; 123.2 kHz; 134.2 kHz; FSK modulation; LF; RF field; RF identification; RFID base station; TIRIS system; Texas Instruments; antenna load; antenna variation tolerance; base station; batteryless transponder design; chip layout; coded data transmission; digital CMOS circuit; electromagnetic energy rectification; frequency bands; output frequencies; self powered transponder design; simulation results; tracking; transponder IC; wireless identification systems; Base stations; Circuits; Data mining; Electromagnetic fields; Frequency shift keying; Loaded antennas; Modulation coding; Radio frequency; Radiofrequency identification; Transponders;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
0-7803-3692-5
DOI :
10.1109/PIMRC.1996.567555
