Title :
A UHF-band RFID transmitter with spur reduction technique using a DLL-based spread-spectrum clock generator
Author :
Seungjin Kim ; In-Young Lee ; Sang-Sung Lee ; Min Su Kil ; Jeongki Choi ; Jinho Ko ; Sang-Gug Lee
Author_Institution :
Dept. of Electr. Eng., KAIST, Daejeon, South Korea
Abstract :
This paper presents a UHF-band RFID transmitter with a robust spur reduction technique using a DLL-based SSCG. By adopting an 8-bit DLL and Hershey-kiss modulated profile together, the SSCG shows more than a 20dB EMI reduction while providing up-, down-, and center-spread modes. Implemented in a 0.18μm CMOS process, the proposed transmitter achieves <; -80dBc spur suppression with 25dBm transmit power at 920MHz, which complies with the most stringent regulatory spectral mask without a SAW-filter.
Keywords :
CMOS integrated circuits; UHF devices; UHF integrated circuits; clocks; delay lock loops; interference suppression; modulation; radio transmitters; radiofrequency identification; radiofrequency interference; spread spectrum communication; CMOS process; DLL-based spread-spectrum clock generator; EMI reduction; Hershey-kiss modulation; SAW-filter; SSCG; UHF-band RFID transmitter; center-spread mode; delay locked loop; down-spread mode; frequency 920 MHz; size 0.18 mum; spur reduction technique; stringent regulatory spectral mask; up-spread mode; word length 8 bit; Clocks; Delays; Electromagnetic interference; Generators; Modulation; Radio transmitters; Radiofrequency identification; RFID; SAW-less transmitter; SSCG;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2014 IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
978-1-4799-3862-9
DOI :
10.1109/RFIC.2014.6851750
